Improved performance of Co-doped Li2O cathodes for lithium-peroxide batteries using LiCoO2 as a dopant source

Hiroaki Kobayashi, Mitsuhiro Hibino, Yoshiyuki Ogasawara, Kazuya Yamaguchi, Tetsuichi Kudo, Shin Ichi Okuoka, Koji Yonehara, Hironobu Ono, Yasutaka Sumida, Masaharu Oshima, Noritaka Mizuno

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


We recently proposed a new battery system based on the redox of lithium peroxide (Li2O2)/lithium oxide (Li2O) at the cathode (lithium-peroxide battery system). In this system, the use of Li2O with cobalt ions partially substituted for lithium ions (Co-doped Li2O) is key to its realization. In this study, to further improve the cell performance, we prepare various Co-doped Li2O samples by a mechanochemical process using different cobalt source materials (e.g., LiCoO2, Co3O4, and CoO) and comparatively investigate them. Amongst the investigated cathode materials, the Co-doped Li2O sample prepared using LiCoO2 with a Co/(Co + Li) ratio of 0.09 exhibits the best performance. Monitoring of the pressure in the cell reveals that this Co-doped Li2O cathode can be charged to 270 mAh g-1 without O2 evolution involving its decomposition. Charge and discharge at 270 mAh g-1 is repeated more than 50 times. In addition, the rate-capability tests reveals that the redox reaction between peroxide and oxide ions is fast and that the cathode can be discharged at a high current density of 1000 mA g-1.

Original languageEnglish
Pages (from-to)567-572
Number of pages6
JournalJournal of Power Sources
Publication statusPublished - 2016 Feb 29
Externally publishedYes


  • Cathode material
  • Lithium oxide doped with Co
  • 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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