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

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)A2293-A2298
JournalJournal of the Electrochemical Society
Volume160
Issue number11
DOIs
Publication statusPublished - 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Characterization of the surface of LiCoO<sub>2</sub> particles modified by Al and Si oxide using analytical tem'. Together they form a unique fingerprint.

Cite this