Article New insight into designing a thick-sintered cathode for Li-ion batteries: the impact of excess lithium in LiCoO2 on its electrode performance

Shinichi Takeno ; Taiki Suematsu ; Ryusei Kunisaki ; Gen Hasegawa SAMURAI ORCID ; Ken Watanabe ORCID ; Naoaki Kuwata SAMURAI ORCID ; Kazutaka Mitsuishi SAMURAI ORCID ; Tsuyoshi Ohnishi SAMURAI ORCID ; Kazunori Takada SAMURAI ORCID ; Kohichi Suematsu ; Kengo Shimanoe

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Shinichi Takeno, Taiki Suematsu, Ryusei Kunisaki, Gen Hasegawa, Ken Watanabe, Naoaki Kuwata, Kazutaka Mitsuishi, Tsuyoshi Ohnishi, Kazunori Takada, Kohichi Suematsu, Kengo Shimanoe. New insight into designing a thick-sintered cathode for Li-ion batteries: the impact of excess lithium in LiCoO2 on its electrode performance. Journal of Materials Chemistry A. 2024, (), . https://doi.org/10.1039/d4ta07377k

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(abstract)

Increasing the capacity of Li-ion batteries is one of the critical issues that must be addressed. A thick and dense electrode using an active material sintered disk is expected to have a high capacity because the volume of the active material is 100% in the cathode. This study focused on LiCoO2, the most well-known active material for the cathode, to improve the properties of the sintered cathode. We investigated the impact of excess Li on various properties. We found that the degree of c-axis orientation in the sintered disk decreased as excess Li increased. In addition, results of 7Li-MAS-NMR suggest the presence of defects resulting from excess Li when the Li excess reached 5.1% or more. The discharge capacity of the LiCoO2 sintered cathode increased as the amount of excess Li increased, and a maximum discharge capacity of 11.2 mA h cm−2 was obtained when the Li excess amount was 7.3%. This result was attributed to the significant improvement in the Li-ion conductivity of LiCoO2 by both the decrease in the degree of c-axis orientation and the introduction of defects due to excess Li. Notably, introducing defects derived from excess Li enhances the Li-ion conductivity. Thus, tuning the amount of excess Li for the LiCoO2 sintered cathode was crucial in enhancing its electrochemical performance as an electrode.

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Keyword: Li-ion battery

Date published: 2024-12-06

Publisher: Royal Society of Chemistry (RSC)

Journal:

  • Journal of Materials Chemistry A (ISSN: 20507488)

Funding:

  • Japan Science and Technology Corporation JPMJGX23S22
  • National Institute for Materials Science
  • Japan Society for the Promotion of Science 22K04739
  • Japan Science and Technology Corporation JPMJAL1301
  • Japan Science and Technology Corporation JPMJFS2132
  • Advanced Low Carbon Technology Research and Development Program

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

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First published URL: https://doi.org/10.1039/d4ta07377k

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Updated at: 2024-12-24 13:58:53 +0900

Published on MDR: 2025-02-17 18:32:29 +0900

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