Anisotropic surface effect on electronic structures and electrochemical properties of LiCoO2

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)15337-15342
Number of pages6
JournalJournal of Physical Chemistry C
Issue number34
Publication statusPublished - 2009 Aug 27
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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