Deterioration analysis in cycling test at high temperature of 60°C for Li-ion cells using SiO anode

Tetsuya Kajita, Ryota Yuge, Kentaro Nakahara, Jiro Iriyama, Hiroo Takahashi, Ryuich Kasahara, Tatsuji Numata, Shin Serizawa, Koji Utsugi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We carried out a deterioration analysis in Li-ion cells using SiO anode at high temperature, i.e., 60°C. The capacity retention at the upper cutoff voltage (UCV) of 4.0, 4.1, and 4.2 V after 400 cycles was about 80, 80, and 20%, respectively. The cell deterioration depended strongly on the upper cutoff voltage and proceeded drastically at 4.2 V. This was because the internal resistance of cell increased by the decomposition of the electrolytic solution during cycles. From depth profile of XPS on the anode, the thick layer containing Li and F has been formed only for UCV = 4.2 V, implying that the electrolyte of LiPF6 is enough to break down carbonate electrolyte at 60°C. Therefore, we found that the optimization of the threshold of UCV for high temperature need to attain the good cycle performance at high temperature in a Li-ion battery using a SiO anode.

Original languageEnglish
Pages (from-to)A708-A711
JournalJournal of the Electrochemical Society
Volume161
Issue number5
DOIs
Publication statusPublished - 2014

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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