Quantitative Analysis of Transition-Metal Migration Induced Electrochemically in Lithium-Rich Layered Oxide Cathode and Its Contribution to Properties at High and Low Temperatures

Ikuma Takahashi, Katsutoshi Fukuda, Tomoya Kawaguchi, Hideyuki Komatsu, Masatsugu Oishi, Haruno Murayama, Masaharu Hatano, Takayuki Terai, Hajime Arai, Yoshiharu Uchimoto, Eiichiro Matsubara

研究成果: Contribution to journalArticle査読

13 被引用数 (Scopus)

抄録

Lithium-rich layered oxides (LLOs) have attracted much attention as high-capacity electrodes in lithium-ion batteries. Especially, LLOs are known to show high performance at high temperature. The transition metal (TM) migrates from the TM layer to the Li layer in the LLO active material during the charge-discharge cycle, which complicates our understanding of its electrochemical properties. In this study, we applied X-ray diffraction spectroscopy (XDS) for acquiring quantitative data on TM migration depending on the crystallographic site in Li1.2-xNi0.13Co0.13Mn0.53O2, and we discuss their influence on the electrochemical properties at 40 and -10°C. The XDS analysis shows that both Mn and Ni in the TM layer migrate to the Li layer during the charge process and return during the discharge process. This reversible migration, observed at 40°C, corresponds to a high capacity. On the other hand, the operation at -10°C decreases the degree of TM migration as well as the charge-discharge capacity. In particular, Mn and Ni hardly migrate to the TM layer and remain at the Li layer at the end of discharge. This clogged interlayer space, which would lower the Li+ diffusion, accounts for the capacity drop. (Graph Presented).

本文言語英語
ページ(範囲)27109-27116
ページ数8
ジャーナルJournal of Physical Chemistry C
120
48
DOI
出版ステータス出版済み - 12 8 2016
外部発表はい

All Science Journal Classification (ASJC) codes

  • 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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