Microstructural changes in LiNi0.8Co0.15Al 0.05O2 positive electrode material during the first cycle

Shijian Zheng, Rong Huang, Yoshinari Makimura, Yoshio Ukyo, Craig A.J. Fisher, Tsukasa Hirayama, Yuichi Ikuhara

Research output: Contribution to journalArticlepeer-review

134 Citations (Scopus)

Abstract

The microstructure of LiNi0.8Co0.15Al 0.05O2 positive electrode material before and after the first cycle was investigated by scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS). STEM and EELS analysis shows that, before cycling, there are very thin layers of material at grain boundaries that contain a small amount of transition metal ions (particularly Ni) on Li sites. After the first cycle, the thickness of some grain boundary layers increases significantly, accompanied by formation of microcracks at grain boundaries. Also, from the grain interior to the grain boundary, the structure gradually changes from an ordered layer structure (α-NaFeO 2-type) to a partially ordered structure and then to a disordered rock-salt structure. We posit that these microstructural changes are primarily responsible for the irreversible capacity during the first cycle.

Original languageEnglish
Pages (from-to)A357-A362
JournalJournal of the Electrochemical Society
Volume158
Issue number4
DOIs
Publication statusPublished - 2011
Externally publishedYes

ASJC Scopus subject areas

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

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