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, Ken Watanabe, Naoaki Kuwata, Kazutaka Mitsuishi, Tsuyoshi Ohnishi, Kazunori Takada, Kohichi Suematsu, Kengo Shimanoe

研究成果: ジャーナルへの寄稿学術誌査読

抄録

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.

本文言語英語
ジャーナルJournal of Materials Chemistry A
DOI
出版ステータス印刷中 - 2024

!!!All Science Journal Classification (ASJC) codes

  • 化学一般
  • 再生可能エネルギー、持続可能性、環境
  • 材料科学一般

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