Synthesis of Cu-doped Li2O and its cathode properties for lithium-ion batteries based on oxide/peroxide redox reactions

Hiroaki Kobayashi, Mitsuhiro Hibino, Tetsuya Makimoto, Yoshiyuki Ogasawara, Kazuya Yamaguchi, Tetsuichi Kudo, Shin ichi Okuoka, Hironobu Ono, Koji Yonehara, Yasutaka Sumida, Noritaka Mizuno

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Cu-doped Li2O, synthesized by mechanochemical reactions between Li2O and CuO, is demonstrated as a cathode material for lithium-ion batteries. The X-ray diffraction and absorption analyses suggest that in the Cu-doped Li2O, Cu2+ ions are located at 48g sites less symmetrical than 8c sites for Li+ ions, distorting the arrangement of surrounding O2− ions slightly from tetrahedral to square-planar, while the Cu2+ ions are doped in an antifluorite-type Li2O. The Cu-doped Li2O cathode has a charge capacity of 360 mAh g−1 without an irreversible O2 gas evolution reaction and exhibits a reversible capacity of 300 mAh g−1. Cu K-edge XANES spectroscopy and quantitative analysis of peroxide species reveal that redox of copper ions, formation/neutralization of O 2p electron holes, and generation/annihilation of peroxide species take place during charge/discharge.

Original languageEnglish
Pages (from-to)365-372
Number of pages8
JournalJournal of Power Sources
Publication statusPublished - 2017 Feb 1
Externally publishedYes


  • Cathode material
  • Cu-doped LiO
  • Lithium-ion battery
  • Lithium-peroxide battery

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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