Characterization of the surface of LiCoO2 particles modified by Al and Si oxide using analytical tem

Noboru Taguchi, Tomoki Akita, Hikari Sakaebe, Kuniaki Tatsumi, Zempachi Ogumi

研究成果: Contribution to journalArticle査読

21 被引用数 (Scopus)

抄録

LiCoO2 particles about 300 nm in size were synthesized by the Pechini method. LiCoO2 modified using Al oxide and Si oxide were also prepared by the sol-gel method. These samples allowed direct TEM observation without sampling damage, and homogeneous distribution of coatingmaterials on the surface was confirmed. The cycling properties of LiCoO2 coated with Al oxide were improved compared with pristine LiCoO2. Samples modified with Si oxide showed poor electrochemical performance. From an analytical TEM study, there was a thin layer of Co and Al mixture on the LiCoO2 surface in the Al oxide coated LiCoO2. By Si oxide coating, a homogeneous layer about 5 nm in thickness was formed. Using an EELS study, the Li ion concentration in particles was mapped under monochromatized electron beam conditions. Homogeneous Li distribution was confirmed in the cycled particles in LiCoO2 coated by Al oxide. In contrast, an inhomogeneous Li distribution was found in pristine and LiCoO2 with Si oxide coating.

本文言語英語
ページ(範囲)A2293-A2298
ジャーナルJournal of the Electrochemical Society
160
11
DOI
出版ステータス出版済み - 2013
外部発表はい

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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