Fluorine and Copper Codoping for High Performance Li2O-Based Cathode Utilizing Solid-State Oxygen Redox

Yuta Shimada, Hiroaki Kobayashi, Yoshiyuki Ogasawara, Mitsuhiro Hibino, Tetsuichi Kudo, Noritaka Mizuno, Kazuya Yamaguchi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Transition-metal-doped Li2O cathodes using redox reaction of solid-state oxygen are candidates as high capacity cathode materials for lithium-ion batteries. In our previously reported study, copper-doped Li2O (CuDL) exhibited a high charge-discharge capacity of 300 mAh g-1. However, the developed cathode not only exhibited poor cyclability but also decomposed during charge-discharge cycles. In this study, fluorine and copper were codoped into the Li2O structure by stepwise mechanochemical reaction to create a high performance cathode with high cyclability. Fluorine-, copper-doped Li2O (F-CuDL) was prepared by the mechanochemical reaction of Li2O with LiF, followed by a reaction with CuO. The F-CuDL cathode exhibited a good cycle performance (300 mAh g-1, 30 cycles at a constant current of 50 mA g-1). X-ray diffraction (XRD) and Cu K-edge X-ray absorption near edge structure (XANES) analyses revealed that F-CuDL does not undergo decomposition even after charge-discharge cycles, revealing that doping with fluorine leads to the stabilization of the CuDL crystal structure.

Original languageEnglish
Pages (from-to)4389-4394
Number of pages6
JournalACS Applied Energy Materials
Issue number6
Publication statusPublished - 2019 Jun 24


  • LiO-based cathode
  • fluorine and copper codoping
  • improvement of cyclability
  • lithium-ion battery
  • solid-state oxygen redox

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering


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