Electrochemical impedance spectroscopy analysis with a symmetric cell for LiCoO<sub>2</sub> cathode degradation correlated with Co dissolution

Hiroki Nara; Keisuke Morita; Tokihiko Yokoshima; Daikichi Mukoyama; Toshiyuki Momma; Tetsuya Osaka; Hiroki Nara; Keisuke Morita; Tokihiko Yokoshima; Daikichi Mukoyama; Toshiyuki Momma; Tetsuya Osaka

doi:10.3934/matersci.2016.2.448

AIMS Materials Science

2016, Volume 3, Issue 2: 448-459. doi: 10.3934/matersci.2016.2.448

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Electrochemical impedance spectroscopy analysis with a symmetric cell for LiCoO₂ cathode degradation correlated with Co dissolution

1.
Research Institute for Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
2.
Graduate School of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan

Received: 18 January 2016 Accepted: 28 March 2016 Published: 05 April 2016

Static degradation of LiCoO₂ cathodes is a problem that hinders accurate analysis using our developed separable symmetric cell. Therefore, in this study we investigate the static degradation of LiCoO₂ cathodes in separable symmetric cells by electrochemical impedance spectroscopy (EIS) and inductively coupled plasma analyses. EIS measurements of LiCoO₂ cathodes are conducted in various electrolytes, with different anions and with or without HF and/or H₂O. This allows us to determine the static degradation of LiCoO₂ cathodes relative to their increase of charge transfer resistance. The increase of the charge transfer resistance of the LiCoO₂ cathodes is attributed to cobalt dissolution from the active material of LiCoO₂. Cobalt dissolution from LiCoO₂ is revealed to occur even at low potential in the presence of HF, which is generated from LiPF₆ and H₂O. The results indicate that avoidance of HF generation is important for the analysis of lithium-ion battery electrodes by using the separable cell. These findings reveal the condition to achieve accurate analysis by EIS using the separable cell.
- electrochemical impedance spectroscopy (EIS),
- Lithium-ion Battery (LIB),
- LiCoO₂ cathode,
- degradation,
- Co dissolution,
- LiPF₆,
- LiClO₄,
- HF
Citation: Hiroki Nara, Keisuke Morita, Tokihiko Yokoshima, Daikichi Mukoyama, Toshiyuki Momma, Tetsuya Osaka. Electrochemical impedance spectroscopy analysis with a symmetric cell for LiCoO2 cathode degradation correlated with Co dissolution[J]. AIMS Materials Science, 2016, 3(2): 448-459. doi: 10.3934/matersci.2016.2.448

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Abstract

Static degradation of LiCoO₂ cathodes is a problem that hinders accurate analysis using our developed separable symmetric cell. Therefore, in this study we investigate the static degradation of LiCoO₂ cathodes in separable symmetric cells by electrochemical impedance spectroscopy (EIS) and inductively coupled plasma analyses. EIS measurements of LiCoO₂ cathodes are conducted in various electrolytes, with different anions and with or without HF and/or H₂O. This allows us to determine the static degradation of LiCoO₂ cathodes relative to their increase of charge transfer resistance. The increase of the charge transfer resistance of the LiCoO₂ cathodes is attributed to cobalt dissolution from the active material of LiCoO₂. Cobalt dissolution from LiCoO₂ is revealed to occur even at low potential in the presence of HF, which is generated from LiPF₆ and H₂O. The results indicate that avoidance of HF generation is important for the analysis of lithium-ion battery electrodes by using the separable cell. These findings reveal the condition to achieve accurate analysis by EIS using the separable cell.

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