Anisotropic surface effect on electronic structures and electrochemical properties of LiCoO2

Itaru Honma*, Masashi Okubo, Jedeok Kim, Tetsuichi Kudo, Haoshen Zhou

*この研究の対応する著者

研究成果: Article査読

40 被引用数 (Scopus)

抄録

Increasing industrial needs for rechargeable batteries delivering higher power has encouraged Advanced research on nanosized electrochemically active compounds. Although nanosized electrode materials are expected to possess much higher power output due to short diffusion length, the nanosize effects on electrodes have not been understood well to date. Here, we report that nanosized LiCoO2 as suggested as electrode material for Li-ion rechargeable batteries has anisotropic surface properties affecting electronic structures, which is evidenced by electron energy loss spectroscopy (EELS). EELS spectroscopy Reveals the reduced valence state of the cobalt near the surface, especially along the stacking direction of CoO2 layers. The observed anisotropic surface property explains the nanosize effect on the electrochemical properties.

本文言語English
ページ(範囲)15337-15342
ページ数6
ジャーナルJournal of Physical Chemistry C
113
34
DOI
出版ステータスPublished - 2009 8月 27
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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