期刊
CONDENSED MATTER
卷 6, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/condmat6030028
关键词
Li-ion battery; positron annihilation spectroscopy; positron annihilation lifetime spectroscopy; doppler broadening spectroscopy; cathode materials; Li diffusion and intercalation
资金
- Ministry of Education and Culture (Finland)
- University of Padova [BIRD187913]
- Italian MIUR [2017MCEEY4]
Positron annihilation spectroscopy using lifetime and Doppler broadening is used to characterize the lithiation state in LiCoO2 thin film in the cathode of lithium-ion batteries. The results show that the presence of graphite in between the oxide grains in real cathode Li-ion batteries causes positron spillover, which affects the measured positron parameters sensitive to delocalized electrons from lithium atoms. The first component of positron lifetime corresponds to a bulk-like state, while the second component represents a surface state at the grain-graphite interface.
Positron annihilation spectroscopy using lifetime and Doppler broadening allows the characterization of the lithiation state in LiCoO2 thin film used in cathode of lithium-ion batteries. The lifetime results reflect positron spillover because of the presence of graphite in between the oxide grains in real cathode Li-ion batteries. This spillover produces an effect in the measured positron parameters which are sensitive to delocalized electrons from lithium atoms as in Compton scattering results. The first component of the positron lifetime corresponds to a bulk-like state and can be used to characterize the state of charge of the cathode while the second component represents a surface state at the grain-graphite interface.
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