Ion transport and phase transformation in thin film intercalation electrodes
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Fabian Wunde
Abstract
Thin film battery electrodes of the olivine structure LiFePO4 and the spinel phase LiMn2O4 are deposited through ion-beam sputtering. The intercalation kinetics is studied by cyclo-voltammetry using variation of the cycling rate over 4 to 5 orders of magnitude. The well-defined layer geometry allows a detailed quantitative analysis. It is shown that LiFePO4 clearly undergoes phase separation during intercalation, although the material is nano-confined and very high charging rates are applied. We present a modified Randles–Sevcik evaluation adapted to phase-separating systems. Both the charging current and the overpotential depend on the film thickness in a systematic way. The analysis yields evidence that the grain boundaries are important short circuit paths for fast transport. They increase the electrochemical active area with increasing layer thickness. Evidence is obtained that the grain boundaries in LiFePO4 have the character of an ion-conductor of vanishing electronic conductivity.
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© 2017, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Priority Programme 1473 (SPP1473) funded by the German Research Foundation: “Materials with new design for improved lithium ion batteries – WeNDeLIB”
- Original Contributions
- Enthalpies of formation of layered LiNixMnxCo1–2xO2 (0 ≤ x ≤ 0.5) compounds as lithium ion battery cathode materials
- Dependence of the constitution, microstructure and electrochemical behaviour of magnetron sputtered Li–Ni–Mn–Co–O thin film cathodes for lithium-ion batteries on the working gas pressure and annealing conditions
- Phase diagram, thermodynamic investigations, and modelling of systems relevant to lithium-ion batteries
- Thin-film calorimetry: In-situ characterization of materials for lithium-ion batteries
- Si- and Sn-containing SiOCN-based nanocomposites as anode materials for lithium ion batteries: synthesis, thermodynamic characterization and modeling
- Phase formation in alloy-type anode materials in the quaternary system Li–Sn–Si–C
- Thermodynamic characterization of lithium monosilicide (LiSi) by means of calorimetry and DFT-calculations
- Thermochemical stability of Li–Cu–O ternary compounds stable at room temperature analyzed by experimental and theoretical methods
- Coexistence of conversion and intercalation mechanisms in lithium ion batteries: Consequences for microstructure and interaction between the active material and electrolyte
- Ion transport and phase transformation in thin film intercalation electrodes
- Electrochemical lithiation of silicon electrodes: neutron reflectometry and secondary ion mass spectrometry investigations
- Interlaboratory study of the heat capacity of LiNi1/3Mn1/3Co1/3O2 (NMC111) with layered structure
- DGM News
- DGM News
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Priority Programme 1473 (SPP1473) funded by the German Research Foundation: “Materials with new design for improved lithium ion batteries – WeNDeLIB”
- Original Contributions
- Enthalpies of formation of layered LiNixMnxCo1–2xO2 (0 ≤ x ≤ 0.5) compounds as lithium ion battery cathode materials
- Dependence of the constitution, microstructure and electrochemical behaviour of magnetron sputtered Li–Ni–Mn–Co–O thin film cathodes for lithium-ion batteries on the working gas pressure and annealing conditions
- Phase diagram, thermodynamic investigations, and modelling of systems relevant to lithium-ion batteries
- Thin-film calorimetry: In-situ characterization of materials for lithium-ion batteries
- Si- and Sn-containing SiOCN-based nanocomposites as anode materials for lithium ion batteries: synthesis, thermodynamic characterization and modeling
- Phase formation in alloy-type anode materials in the quaternary system Li–Sn–Si–C
- Thermodynamic characterization of lithium monosilicide (LiSi) by means of calorimetry and DFT-calculations
- Thermochemical stability of Li–Cu–O ternary compounds stable at room temperature analyzed by experimental and theoretical methods
- Coexistence of conversion and intercalation mechanisms in lithium ion batteries: Consequences for microstructure and interaction between the active material and electrolyte
- Ion transport and phase transformation in thin film intercalation electrodes
- Electrochemical lithiation of silicon electrodes: neutron reflectometry and secondary ion mass spectrometry investigations
- Interlaboratory study of the heat capacity of LiNi1/3Mn1/3Co1/3O2 (NMC111) with layered structure
- DGM News
- DGM News
