Production of nickel-rich LiNi0.89Co0.08Al0.03O2 cathode material for high capacity NCA/graphite secondary battery fabrication
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Cornelius Satria Yudha
Abstract
Li-ion secondary battery is highly recommended as a power source to highly advanced battery electric vehicles. Among various types, the lithium nickel cobalt aluminum oxide (NCA) battery is considered suitable for high energy and power application. In this study, the NCA cathode material LiNi0.89Co0.08Al0.03O2 was produced via the oxalate co-precipitation technique to reduce the overall production cost and process complexity. Oxalic acid and a small amount of sodium hydroxide were used as the precipitant and pH regulator, respectively. Homogenous and loose metal oxalate precipitate formation was confirmed by X-ray diffraction (XRD), scanning electron microscopy, and Fourier-transform infrared spectroscopy analysis. XRD patterns of the as-obtained micron-sized NCA showed a well-layered hexagonal structure. The electrochemical properties of the cathode in the full cell were thoroughly examined. The specific discharge capacity of the as-obtained NCA in NCA/LiPF6/graphite at a current rate of 20 mA/g was 142 mAh/g. The as-prepared NCA sample had capacity retention of 80% after being charged and discharged at 0.1 A/g for 101 cycles. Scaling up of NCA production process to 2 kg per batch was conducted and evaluation of NCA product quality was performed by material characterization. Based on the overall results and considering the overall process, such an approach is expected to be developed and improved for future large-scale production purposes.
1 Introduction
A layered type lithium nickel cobalt aluminum oxide (NCA) is considered as one of the promising and state-of-the-art cathode materials for Li-ion batteries (LIBs), owing to its excellent properties such as high columbic capacity, gravimetric energy density, and power density [1]. Currently, NCA with high nickel content such as LiNi0.815Co0.15Al0.035O2 is preferable because nickel is less toxic and less costly than cobalt [2,3]. In addition, the Ni-rich cathode material has a higher capacity than high cobalt content LiCoO2. As a result, NCA/graphite batteries are a strong power source candidate for highly advanced electric vehicles.
Several attempts have been made to fabricate NCA micro-powders. The most convenient method is through the solid-state approach, which is limited to mixing the decomposable precursor with the lithium source followed by high-temperature annealing [4,5]. Decomposable precursors such as the hydroxide precursor and nitrate precursor are considered expensive, as their use increases the overall production cost. A similar concept was applied with the sol–gel method and spray pyrolysis where decomposable precursors are necessary [6–9]. Co-precipitation techniques are commonly applied for synthesizing the mixed metal precursor because the processes are facile, simple, do not require complex apparatus, and can be easily scaled up [10–12]. The raw materials have easy availability especially sulfate and chloride salts. The as-obtained powders usually have homogenous atom distribution and identical morphology with narrow size distribution. Thus, the co-precipitation process is suitable for synthesizing NCA precursors [3,13,14].
By far, co-precipitation of Ni–Co–Al salt solution was performed by hydroxide precipitation using sodium hydroxide (NaOH) as precipitant and ammonia as chelating agents. However, hydroxide precipitation of Ni–Co–Al ions is hampered by the dissolution of Al ions in elevated pH level that can cause poor homogeneity and agglomerated primary particles that often result in poor shelf-life of LIBs [3,15,16]. During the precipitation process, Co ions can be oxidized if the atmosphere is not inert. On the other hand, hydroxide co-precipitation requires a high amount of ammonia that is considered dangerous for aquatic life. The presence of ammonia in the ingredient also creates several respiratory problems for humans. Carbonate co-precipitation was applied due to the fast formation of particles in mild pH conditions; however, it still required significant ammonia during the precipitation as the chelating agent and pH regulator [17]. In contrast, oxalate precipitation is considered promising, as oxalate ions can be a precipitant, chelating, and reducing agent all at once, which is highly favorable for the overall process. Since the use of oxalic acid decreases the pH significantly, the pH can be regulated by an alkaline solution such as NaOH, thus the use of ammonia is unnecessary [18].
Several efforts have been employed to produce NCA using oxalic acid as a precipitant. Wu et al. [19] performed Ni–Co–Al oxalate via the two-step co-precipitation process to obtain a micro-rod-shaped NCA. Qiu et al. [20] performed precipitation of NCA from acetate salts precursors; however, in the study, water was removed by evaporation instead of the simple filtration process. This study was conducted to produce Ni-rich NCA micro-powders using simple, ammonia-free, one-step oxalate co-precipitation followed by heat treatments. As far as our concern, such technique has never been reported elsewhere and has never used to be applied for large scale production of NCA type layered transition oxide cathode material. In other words, the proposed technique is potentially adapted for ammonia free-mass production of high energy density LIBs cathode material. In addition, the as-prepared material was tested in full-cell configuration. Thus, the study provided strong evidence for material utilization in the LIBs industry.
2 Materials and methods
Lithium hydroxide monohydrate, EN grade nickel sulfate hexahydrate (Zenith, Brazil), cobalt sulfate heptahydrate (Rubamin, India), and aluminum sulfate octadecahydrate (Mahkota, Indonesia) were used as Li, Ni, Co, and Al sources, respectively. Oxalic acid dihydrate (YC Chemicals Ltd, China) and NaOH (Asahi, Japan) were used as the precipitant and pH regulator, respectively. All of the materials were used directly without any purification step.
A 1 M of a solution containing Ni:Co:Al with molecular ratio of 89:8:3 was continuously stirred in a glass beaker and heated at 60°C for 30 min. The 1.5 M of the oxalic acid solution was transferred to the beaker with vigorous stirring until a bright green precipitate was formed. The solution pH of 3–4 was obtained by the addition of the 4 M NaOH solution. After 120 min, the stirring and heating were stopped, and the precipitate settled after the stirring was stopped. The solution was removed and changed with deionized water. The precipitate was filtered and washed until the solution reached neutral. The precipitate (NCA-oxalate) was transferred to an oven overnight or until dried. The dried precipitate was mixed with LiOH·H2O (Leverton, India), using a planetary ball mill, ensuring a precursor to Li ratio of 1:1.05. After mixing homogenously, the precursor was heated at 500°C for 6 h and calcined at 800°C for 20 h under an O2 atmosphere. The as-prepared product was sieved to fine powder. Large-scale production of NCA with a capacity of 2 kg per batch was conducted using a similar technique.
The structure of NCA samples was examined by an MD-10 X-ray diffractometer (MTI, USA). The samples’ surface properties were analyzed using Fourier transform infrared (FTIR) spectroscopy (Shimadzu, Japan) and scanning electron microscope (SEM) (JEOL. Japan). A galvanostatic charge–discharge test was performed in NCA/LiPF6/graphite cylindrical cells where the as-obtained NCA was used as the cathode of the cells. The electrode was fabricated with a coating of slurry containing 90:4:6 of NCA:acetylene black (AB):polyvinyl difluoride (PVdF) on the surfaces of Al foils. The coated foils were dried in a vacuum oven. The dried cathode was ready to be assembled with the graphite-coated Cu foil. The details of cylindrical cell assembly were described elsewhere in our previous reports [16,21]. Water-based manufacturing of NCA counter electrode was also conducted with a slurry containing 89:6:3:1:1 of meso carbon microbeads:AB:carboxy-methyl cellulose (CMC):styrene-butadiene rubber (SBR):oxalic acid. AB, PVdF, CMC, and SBR were obtained from MTI, USA. The manufactured cell was charged and discharged using 1/10 C (1 C = 0.2 A/g) the current rate at the working voltage of 3.0–4.3 V using Neware Battery Analyzer (Neware, China) and BTS 7.6 Software. The cycle performance test was conducted using various charge–discharge rates (1 C = 200 mA/g), without any temperature control.
3 Results and discussions
3.1 Precipitation of NCA-oxalate
To assure the formation of the oxalate precipitate of NCA, the dried precipitate was analyzed using X-ray diffraction (XRD) and FTIR. Figure 1(a) displays the XRD patterns of the precipitate. The XRD peaks can be attributed to the nickel oxalate dihydrate compound, while the Miller indices are provided in the figure. The peaks observed are highly crystalline indicated by the sharp peaks on the pattern. The lattice parameter of NCA-oxalate powder is listed in Table 1. The a, b, and c values of the sample are almost similar with nickel oxalate dihydrate reference or Joint committee on the Powder Diffraction Standards (JCPDS) card no. 25-0582 [22], whereas the slight differences can be attributed to the presence of Co and Al atoms in the crystal structure. The lattice parameter values can be determined by linear regression of equations (1)–(3):

(a) X-ray diffractogram of NCA-oxalate and (b) modified FTIR spectra of NCA-oxalate.
Lattice parameter and structural parameter of the as-prepared NCA-oxalate
Parameters | Value | Ref. NiC2O4·H2O [22] | Unit |
---|---|---|---|
Lattice | |||
|
11.837 | 11.762 | Ǻ |
|
5.342 | 5.332 | Ǻ |
|
15.623 | 15.726 | Ǻ |
|
988.007 | 986.256 | Ǻ3 |
Based on Figure 1(b), infrared absorption patterns also confirm the presence of oxalate due to the O–C–O vibration located at a wavelength of 1,300 and 1,635 cm−1. The hydrated crystal of oxalate is detected due to the presence of bending vibration of –OH at a wavelength of about 3,400 cm−1. Thus, we can conclude that oxalate precipitation was successfully conducted [23].
The morphology of NCA-oxalate particles is depicted in Figure 2(a and b). The as-prepared NCA-oxalate powders are loose, irregular, or quasi-cubical shaped with smooth surfaces. The edges of the particles as well as the grains can be observed. It is safe to say that the particles have a homogenous shape with a size range of 1–3 µm. Figure 2(c) shows the EDX analysis of NCA-oxalate. It also can be seen that the sample has high Ni content and small Co and Al content. It can be concluded that aluminum ions can be precipitated during the co-precipitation due to mild pH solution (∼4) where Al ion precipitation is possible in the form of aluminum hydroxide [24,25]. A small amount of S can be attributed to the presence of sulfate while the presence of Mn can be attributed to the low-quality grade of metal sulfate salt precursors.

SEM images and EDX analysis of NCA-oxalate (a)–(c).
3.2 LiNi0.89Co0.08Al0.03O2 (NCA) characterization
In this study, LiNi0.89Co0.08Al0.03O2 powder was obtained by a high-temperature lithiation of the NCA precursor. Figure 3(a) displays the X-ray diffractogram of as-prepared NCA. The peaks observed in Figure 3(a) are well indexed to the JCPDS card no. 87-1562 where the Miller indices are displayed as shown in the figure, with no impurities detected. It can be concluded that the material has a layered structure with the hexagonal ordering of atoms [26,27]. Peak doublets splitting of (006/102) and (018/110) are observed, which is based on previous studies. The appearance of these peaks on a layered structure cathode material means that the material has a good structural property, which favors the lithium transfer process when applied to LIBs cells [15,28]. The formation or the unsuccessful oxidation of Ni2+ brings a negative effect on the NCA electrochemical performance. The similar atomic radii of Ni2+ and Li+ often cause a cation mixing phenomenon in the structure lattice. The presence of Ni2+ in the Li layer forms a blockade that prevents Li-ion mobility during the charge–discharge process. The level of cation mixing of layered material can be evaluated by the intensity ratio of peaks (003) and (104) or I(003)/(104). From Figure 4, we can also conclude that as-prepared NCA powder has a low tendency to form cation displacement of Li and Ni or cation mixing, owing to the peak intensity ratio (103)/(104) value of over 1.3 [28,29].

(a) X-ray diffractogram and (b) modified FTIR spectra of as-prepared NCA powder.

SEM images of NCA powder.
Figure 3(b) exhibits the IR absorbance spectra of NCA. The slightly observed peak at a wavenumber of around 3,400 cm−1 can be attributed to the presence of water molecules in the sample [30]. Nickel-rich cathode material such as NCA is hygroscopic; therefore, this phenomenon occurred due to water absorption on the surface of the NCA particle due to humidity. Observed peak doublets at approximately 1,600 cm−1 indicate the existing residual and unreacted Li in the form of Li2CO3, which exist due to excess lithium added during the high-temperature lithiation process. However, from both Figure 3(a) and (b), we can conclude that the well-indexed, layered structure of NCA powder is successfully synthesized and the lattice and structural parameters are listed in Table 2 [16,31].
Lattice parameter and structural parameter of the as-prepared NCA powder
Parameters | Value | Unit |
---|---|---|
Lattice | ||
|
2.867 | Ǻ |
|
14.177 | Ǻ |
|
4.945 | Ǻ |
|
302.755 | Ǻ3 |
Structure | ||
|
1.409 | — |
|
0.306 | — |
|
55 | nm |
The as-prepared NCA particles can be seen in Figure 4. The particles have clear edges and a slightly smooth surface. After a sintering process at a high temperature, the morphology of the particles is sustained from its original form of NCA-oxalate, even though CO2 was decomposed during the calcination process, leaving porous particles, as described by Qiu et al. However, high-temperature sintering may remove the porous particles into dense particles [20].
3.3 Galvanostatic charge–discharge performance of the NCA in NCA/LiPF6/graphite battery
Charge–discharge analysis of as-prepared NCA powders was conducted in anode-free Li-ion batteries (AFLIB) and full battery design where the cathode material is the as-prepared NCA. Bare Cu foil was used for Li-plating during the charging process of AFLIB. Graphite was utilized as the anode where the theoretical capacity was designed in excess; therefore, the mass of NCA was selected as the basis of weight for calculating specific capacity. About 1 M LiPF6 dissolved inhomogeneous mixture of 1:1 dimethyl carbonate and ethyl carbonate was used as the aprotic electrolyte. The charge–discharge profile of the NCA/LiPF6/Cu and NCA/LiPF6/graphite cells can be seen in Figure 5. In the first cycle, during the charging process, the Li-ions were transferred from the cathode lattice to the counter electrode. The voltage was initially zero and then started to elevate as more Li-ions were transferred. In Figure 5a, the voltage of the cell increased rapidly at ∼3.8 V which indicates an initial Li-plating of Li-ion on the surface of Cu foil. The initial charge–discharge capacity of NCA in AFLIB is 216 and 149 mAh/g, respectively. In the second cycle, the capacity improved to above 153 mAh/g while in the sixth cycle, the capacity significantly decreased. This indicates that during the initial charge, some of the material is still inactive while in the sixth cycle the decay was caused by dead Li formation often found in AFLIB [32]. After the cell reached 4.3 V, the cells are discharged where the Li-ions are transferred from the anode back to the cathode. Thus, such a phenomenon is often called the rocking chair mechanism [33]. From Figure 5b, in the first cycle, the specific charge capacity is also larger than the discharge capacity. The initial capacity loss can be attributed to the formation of solid electrolyte interphase (SEI), where some of the Li is deposited on the surface of the anode, which disabled its mobility to return to the cathode during discharge. However, in the second cycle and the sixth cycle, the specific charge capacity and the specific discharge capacity are equal, where the columbic efficiency value is approaching almost 100%. The initial discharge capacity of NCA is 142 mAh/g operated at a charge–discharge current of 20 mA/g and voltage window of 3.0–4.3 V. The capacity is lower compared to several studies. This can be caused by several factors. For instance, the nickel content in this research is significantly higher. Higher Ni content material is often hard to oxidize and suffers from the formation of electrochemically inactive phase. Secondly, the morphology can be a factor since nickel-rich cathode is highly sensitive towards side reactions with the electrolyte, especially particles with small size and large surface area. However, this result is considered good, considering that the overall process is simple, cheap, fast, and less harmful for the environment due to the absence of ammonia.

Charge–discharge profile of (a) NCA/LiPF6/Cu AFLIB and (b) full cell NCA/LiPF6/graphite cells.
Figure 6(a) exhibits the cycle performance of the NCA/LiPF6/graphite cells under the current rate of 1/2 C (100 mAh/g) with the operating voltage of 3.0–4.3 V. Based on the figure, the cells have columbic efficiency of about 100%, which indicates good Li-ion reversibility. However, after 100 cycles, a capacity drop can be observed clearly. At a current of 1/2 C, the specific discharge capacity of the cell is about 130 mAh/g, which is 91% compared to the capacity tested at 1/10 C. In the 101st cycle, the specific discharge capacity of the cell is about 105 mAh/g, which is 80.1% compared to the starting capacity. The capacity retention profile is displayed in Figure 6(b) [34]. The reduction of capacity occurred significantly in the first 20 cycles; however, in the 21st cycle the curve shows better capacity. The rapid capacity decay at early cycles may be caused by the existence of residual Li, particularly Li2CO3 which is confirmed by a previous FTIR study. Li2CO3 presence can promote the formation of HF which can severe the NCA particle [35]. The accumulated coulombic inefficiency in Figure 3c shows that the curve is consistently increasing which is consistent with the cycle performance which also shows a relatively consistent capacity decrease [36]. The rate ability of NCA displayed in Figure 6d indicates that NCA is still operable at an elevated current of 1, 2, 4, and 8 C with an average discharge capacity of 123, 101, 80, and 28 mAh/g, respectively. The NCA still has a capacity of 121 mAh/g when charged and discharged at 1 C which proves that the cell has good reversibility.

(a) Cycle performance, (b) capacity retention profile, (c) accumulated coloumbic inefficiency, and (d) rate ability of NCA/LiPF6/graphite cells.
3.4 Preliminary demo-plant-scale production of LiNi0.89Co0.08Al0.03O2
A 100-time multiplication of previous lab-scale production was conducted. About 2 kg of NCA product was synthesized and characterized. The production facility can be seen in Figure 7(a). The NCA precursor solution was reacted with NaOH and oxalic acid in a continuously stirred reactor. The slurry was filtered and washed using a centrifugal filter and the cake was dried in a vacuum oven. The precursor was milled with LiOH using a ball mill machine, then the composite was fired in a large muffle furnace under O2 flow. The characterization of NCA-oxalate and NCA products produced at 1 kg/batch scale, labeled as NCA-OLS and NCA-LS, respectively, can be seen in Figure 7(b–e). Figure 7(b) shows the FTIR spectra of NCA-oxalate and NCA products. Based on the figure, NCA-oxalate dihydrate was successfully synthesized as the patterns are identical with the pattern in Figure 1(b) while the NCA-LS FTIR spectra have lower CO2 peaks due to isolated grinding and sieving process using a ball-mill machine thus less exposure to the atmosphere. Figure 7c shows the XRD pattern of NCA-LS while the SEM images can be seen in figure inset. The XRD peaks of NCA-LS are well indexed to NCA reference while the SEM image confirms that there is a significant difference of morphology between NCA-LS with NCA in Figure 4. The NCA-LS primary particles size is less than 1 µm which forms a large micron-sized secondary particle. The I (003)/I (104) value is higher than NCA produced at the lab scale. Cell performance of NCA-LS is depicted in Figure 7(d and e). The initial specific charge and discharge capacity of NCA-LS is 210 and 136 mAh/g, respectively, which is lower than NCA produced at the lab scale. The lower capacity is considered normal since the production capacity was significantly increased. A large amount of processed material required a challenging parameter modification, especially to avoid cation mixing which often occurred in layered transitional metal oxide cathode material. This phenomenon always occurs in Ni-rich cathode material. The cycle performance was conducted at 1/2 C (100 mA/g) where the cell exhibited more stable performance owing to low cation disarrangement which was indicated by the I ratio value and less residual Li content on the surface of the material. The result is considered promising but it can be improved by optimization. Nevertheless, further research and deep investigation on process scale-up of NCA production are necessary to be performed shortly.

(a) Flow diagram of 2 kg per batch of NCA production and product (NCA-LS) characterization by (b) FTIR, (c) XRD/SEM, (d) charge–discharge performance test, and (e) cycle performance test.
3.5 Post-mortem analysis of LiNi0.89Co0.08Al0.03O2 (NCA-LS)
A post-mortem analysis was conducted to investigate the condition of NCA material after cycled for 50 times. From the previous discussion, a capacity decay during the cycling test was unavoidable. The loss of active material during a cycling test, the loss of reversible lithium-ion, and impedance increase is the reason for capacity decay. FTIR studies of the post-cycled sample in Figure 8a show the occurrence of alkyl-oxide-lithium or ROLi, ROCO2Li, and carbonate species as a result of organic electrolyte degradation. The SEM image in Figure 8b confirms the presence of the SEI layer on the surface of the NCA-post-cycle [37].

(a) FTIR and (b) SEM image of post-cycled NCA-LS.
4 Conclusion
A simple oxalate co-precipitation technique was successfully applied to produce high Ni content of LiNi0.89Co0.08Al0.03O2 (NCA) cathode material of LIBs. Based on the XRD and FTIR analysis, a nickel-rich oxalate precursor was successfully formed by the reaction of a solution containing Ni, Co, and Al ions with oxalic acid. After the heating process, highly crystalline material with good structural property NCA powders was obtained, which was confirmed by XRD and FTIR analysis. The initial discharge capacity of the as-obtained NCA was 142 mAh/g, measured at a charge–discharge current of 1/10 C and voltage window of 3.0–4.3 V. After 101 cycles at 1/2 C, the cell has a capacity retention of 80%. Scale-up production of NCA powder with a processing capacity of 2 kg per batch is conducted. The results are satisfying; however, there is room for many improvements. We can conclude that the overall process is promising to be further developed in the future.
Acknowledgment
The authors acknowledge financial support by UMG Idealab Indonesia.
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Funding information: We also acknowledge Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Sebelas Maret for the support through Penelitian Fundamental (PF) grant no. 254/UN27.22/PT.01.03/2022.
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Author contributions: Conceptualization, C. S. Yudha and A. Purwanto.; methodology, H. Widiyandari and C. S. Yudha; data curation, M. Rahmawati; writing—review and editing, C. S. Yudha and A. Purwanto.; supervision, H.K. Aliwarga. All authors have read and agreed to the published version of the manuscript.
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Conflict of interest: The authors state no conflict of interest.
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Data availability statement: The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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© 2022 Cornelius Satria Yudha et al., published by De Gruyter
This work is licensed under the Creative Commons Attribution 4.0 International License.
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- Review Articles
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- Waste aggregate concrete properties using waste tiles as coarse aggregate and modified with PC superplasticizer
- CuO–Cu/water hybrid nonofluid potentials in impingement jet
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Articles in the same Issue
- Regular Articles
- Performance of a horizontal well in a bounded anisotropic reservoir: Part I: Mathematical analysis
- Key competences for Transport 4.0 – Educators’ and Practitioners’ opinions
- COVID-19 lockdown impact on CERN seismic station ambient noise levels
- Constraint evaluation and effects on selected fracture parameters for single-edge notched beam under four-point bending
- Minimizing form errors in additive manufacturing with part build orientation: An optimization method for continuous solution spaces
- The method of selecting adaptive devices for the needs of drivers with disabilities
- Control logic algorithm to create gaps for mixed traffic: A comprehensive evaluation
- Numerical prediction of cavitation phenomena on marine vessel: Effect of the water environment profile on the propulsion performance
- Boundary element analysis of rotating functionally graded anisotropic fiber-reinforced magneto-thermoelastic composites
- Effect of heat-treatment processes and high temperature variation of acid-chloride media on the corrosion resistance of B265 (Ti–6Al–4V) titanium alloy in acid-chloride solution
- Influence of selected physical parameters on vibroinsulation of base-exited vibratory conveyors
- System and eco-material design based on slow-release ferrate(vi) combined with ultrasound for ballast water treatment
- Experimental investigations on transmission of whole body vibration to the wheelchair user's body
- Determination of accident scenarios via freely available accident databases
- Elastic–plastic analysis of the plane strain under combined thermal and pressure loads with a new technique in the finite element method
- Design and development of the application monitoring the use of server resources for server maintenance
- The LBC-3 lightweight encryption algorithm
- Impact of the COVID-19 pandemic on road traffic accident forecasting in Poland and Slovakia
- Development and implementation of disaster recovery plan in stock exchange industry in Indonesia
- Pre-determination of prediction of yield-line pattern of slabs using Voronoi diagrams
- Urban air mobility and flying cars: Overview, examples, prospects, drawbacks, and solutions
- Stadiums based on curvilinear geometry: Approximation of the ellipsoid offset surface
- Driftwood blocking sensitivity on sluice gate flow
- Solar PV power forecasting at Yarmouk University using machine learning techniques
- 3D FE modeling of cable-stayed bridge according to ICE code
- Review Articles
- Partial discharge calibrator of a cavity inside high-voltage insulator
- Health issues using 5G frequencies from an engineering perspective: Current review
- Modern structures of military logistic bridges
- Retraction
- Retraction note: COVID-19 lockdown impact on CERN seismic station ambient noise levels
- Special Issue: Trends in Logistics and Production for the 21st Century - Part II
- Solving transportation externalities, economic approaches, and their risks
- Demand forecast for parking spaces and parking areas in Olomouc
- Rescue of persons in traffic accidents on roads
- Special Issue: ICRTEEC - 2021 - Part II
- Switching transient analysis for low voltage distribution cable
- Frequency amelioration of an interconnected microgrid system
- Wireless power transfer topology analysis for inkjet-printed coil
- Analysis and control strategy of standalone PV system with various reference frames
- Special Issue: AESMT
- Study of emitted gases from incinerator of Al-Sadr hospital in Najaf city
- Experimentally investigating comparison between the behavior of fibrous concrete slabs with steel stiffeners and reinforced concrete slabs under dynamic–static loads
- ANN-based model to predict groundwater salinity: A case study of West Najaf–Kerbala region
- Future short-term estimation of flowrate of the Euphrates river catchment located in Al-Najaf Governorate, Iraq through using weather data and statistical downscaling model
- Utilization of ANN technique to estimate the discharge coefficient for trapezoidal weir-gate
- Experimental study to enhance the productivity of single-slope single-basin solar still
- An empirical formula development to predict suspended sediment load for Khour Al-Zubair port, South of Iraq
- A model for variation with time of flexiblepavement temperature
- Analytical and numerical investigation of free vibration for stepped beam with different materials
- Identifying the reasons for the prolongation of school construction projects in Najaf
- Spatial mixture modeling for analyzing a rainfall pattern: A case study in Ireland
- Flow parameters effect on water hammer stability in hydraulic system by using state-space method
- Experimental study of the behaviour and failure modes of tapered castellated steel beams
- Water hammer phenomenon in pumping stations: A stability investigation based on root locus
- Mechanical properties and freeze-thaw resistance of lightweight aggregate concrete using artificial clay aggregate
- Compatibility between delay functions and highway capacity manual on Iraqi highways
- The effect of expanded polystyrene beads (EPS) on the physical and mechanical properties of aerated concrete
- The effect of cutoff angle on the head pressure underneath dams constructed on soils having rectangular void
- An experimental study on vibration isolation by open and in-filled trenches
- Designing a 3D virtual test platform for evaluating prosthetic knee joint performance during the walking cycle
- Special Issue: AESMT-2 - Part I
- Optimization process of resistance spot welding for high-strength low-alloy steel using Taguchi method
- Cyclic performance of moment connections with reduced beam sections using different cut-flange profiles
- Time overruns in the construction projects in Iraq: Case study on investigating and analyzing the root causes
- Contribution of lift-to-drag ratio on power coefficient of HAWT blade for different cross-sections
- Geotechnical correlations of soil properties in Hilla City – Iraq
- Improve the performance of solar thermal collectors by varying the concentration and nanoparticles diameter of silicon dioxide
- Enhancement of evaporative cooling system in a green-house by geothermal energy
- Destructive and nondestructive tests formulation for concrete containing polyolefin fibers
- Quantify distribution of topsoil erodibility factor for watersheds that feed the Al-Shewicha trough – Iraq using GIS
- Seamless geospatial data methodology for topographic map: A case study on Baghdad
- Mechanical properties investigation of composite FGM fabricated from Al/Zn
- Causes of change orders in the cycle of construction project: A case study in Al-Najaf province
- Optimum hydraulic investigation of pipe aqueduct by MATLAB software and Newton–Raphson method
- Numerical analysis of high-strength reinforcing steel with conventional strength in reinforced concrete beams under monotonic loading
- Deriving rainfall intensity–duration–frequency (IDF) curves and testing the best distribution using EasyFit software 5.5 for Kut city, Iraq
- Designing of a dual-functional XOR block in QCA technology
- Producing low-cost self-consolidation concrete using sustainable material
- Performance of the anaerobic baffled reactor for primary treatment of rural domestic wastewater in Iraq
- Enhancement isolation antenna to multi-port for wireless communication
- A comparative study of different coagulants used in treatment of turbid water
- Field tests of grouted ground anchors in the sandy soil of Najaf, Iraq
- New methodology to reduce power by using smart street lighting system
- Optimization of the synergistic effect of micro silica and fly ash on the behavior of concrete using response surface method
- Ergodic capacity of correlated multiple-input–multiple-output channel with impact of transmitter impairments
- Numerical studies of the simultaneous development of forced convective laminar flow with heat transfer inside a microtube at a uniform temperature
- Enhancement of heat transfer from solar thermal collector using nanofluid
- Improvement of permeable asphalt pavement by adding crumb rubber waste
- Study the effect of adding zirconia particles to nickel–phosphorus electroless coatings as product innovation on stainless steel substrate
- Waste aggregate concrete properties using waste tiles as coarse aggregate and modified with PC superplasticizer
- CuO–Cu/water hybrid nonofluid potentials in impingement jet
- Satellite vibration effects on communication quality of OISN system
- Special Issue: Annual Engineering and Vocational Education Conference - Part III
- Mechanical and thermal properties of recycled high-density polyethylene/bamboo with different fiber loadings
- Special Issue: Advanced Energy Storage
- Cu-foil modification for anode-free lithium-ion battery from electronic cable waste
- Review of various sulfide electrolyte types for solid-state lithium-ion batteries
- Optimization type of filler on electrochemical and thermal properties of gel polymer electrolytes membranes for safety lithium-ion batteries
- Pr-doped BiFeO3 thin films growth on quartz using chemical solution deposition
- An environmentally friendly hydrometallurgy process for the recovery and reuse of metals from spent lithium-ion batteries, using organic acid
- Production of nickel-rich LiNi0.89Co0.08Al0.03O2 cathode material for high capacity NCA/graphite secondary battery fabrication
- Special Issue: Sustainable Materials Production and Processes
- Corrosion polarization and passivation behavior of selected stainless steel alloys and Ti6Al4V titanium in elevated temperature acid-chloride electrolytes
- Special Issue: Modern Scientific Problems in Civil Engineering - Part II
- The modelling of railway subgrade strengthening foundation on weak soils
- Special Issue: Automation in Finland 2021 - Part II
- Manufacturing operations as services by robots with skills
- Foundations and case studies on the scalable intelligence in AIoT domains
- Safety risk sources of autonomous mobile machines
- Special Issue: 49th KKBN - Part I
- Residual magnetic field as a source of information about steel wire rope technical condition
- Monitoring the boundary of an adhesive coating to a steel substrate with an ultrasonic Rayleigh wave
- Detection of early stage of ductile and fatigue damage presented in Inconel 718 alloy using instrumented indentation technique
- Identification and characterization of the grinding burns by eddy current method
- Special Issue: ICIMECE 2020 - Part II
- Selection of MR damper model suitable for SMC applied to semi-active suspension system by using similarity measures