Article In Situ X-ray Diffraction of LiCoO2 in Thin-Film Batteries under High-Voltage Charging

Tsuyoshi Ohnishi SAMURAI ORCID (National Institute for Materials Science) ; Kazutaka Mitsuishi SAMURAI ORCID (National Institute for Materials Science) ; Kazunori Takada SAMURAI ORCID (National Institute for Materials Science)

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Tsuyoshi Ohnishi, Kazutaka Mitsuishi, Kazunori Takada. In Situ X-ray Diffraction of LiCoO2 in Thin-Film Batteries under High-Voltage Charging. ACS Applied Energy Materials. 2021, 4 (12), 14372-14379.
SAMURAI

Description:

(abstract)

LiCoO2 has been used as the cathode material employed in lithium-ion batteries since their birth, and efforts to improve its performance are still in progress. For example, complete use of lithium provides the theoretical capacity as high as 274 mAh g−1; however, charge-discharge cycling with such a high capacity leads to rapid degradation. The degradation mechanism has been intensively studied in order to increase the practical capacity. Although phase transitions taking place in high-voltage charging have been considered to affect the cycling performance, side reactions induced by the high-voltage charging always overlap to blur the effects of phase transitions on the electrode properties. This study has unveiled the relation between the phase transition and electrode properties by employing a solid electrolyte that suppresses the side reactions efficiently. Electrochemical impedance spectroscopy combined with in-situ X-ray diffraction shows clear correlation between phase transition from O3 to H1-3 and drastic increase in the electrode resistance. The increasing resistance is attributable to formation of narrow interlayers with gallery height of 4.2 Å that impede lithium-ion diffusion.

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Keyword: Battery

Date published: 2021-12-27

Publisher: American Chemical Society (ACS)

Journal:

  • ACS Applied Energy Materials (ISSN: 25740962) vol. 4 issue. 12 p. 14372-14379

Funding:

  • Ministry of Education, Culture, Sports, Science and Technology Materials Processing Science project (Matereali
  • Japan Society for the Promotion of Science JP19H05813
  • Japan Science and Technology Agency JPMJPF2016
  • Advanced Low Carbon Technology Research and Development Program

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acsaem.1c03046

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Updated at: 2024-09-11 08:30:23 +0900

Published on MDR: 2024-09-11 08:30:23 +0900

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