Metastable and Nanosized Li_1.2Nb_0.2V_0.6O₂ for High-Energy Li-ion Batteries

• QI Ruijie

  Department of Chemistry and Life Science, Yokohama National University

• CAMPÉON Benoît D. L.

  Advanced Chemical Energy Research Center, Institute of Advanced Sciences, Yokohama National University

• KONUMA Itsuki

  Department of Chemistry and Life Science, Yokohama National University

• SATO Yoshihiko

  Department of Chemistry and Life Science, Yokohama National University

• KANEDA Yuko

  Instrumental Analysis Center at Yokohama National, Yokohama National University

• KONDO Masashi

  Instrumental Analysis Center at Yokohama National, Yokohama National University

• YABUUCHI Naoaki

  Department of Chemistry and Life Science, Yokohama National University Advanced Chemical Energy Research Center, Institute of Advanced Sciences, Yokohama National University Elements Strategy Initiative for Catalysts and Batteries, Kyoto University

Bibliographic Information

Other Title

• Metastable and nanosized Li1.2Nb0.2V0.6O2 for high-energy Li-ion batteries

Abstract

A Li-excess cation-disordered rocksalt oxide, Li_1.2Nb_0.2V_0.6O₂, with higher theoretical capacity than traditional stoichiometric and layered oxides, is synthesized and tested as positive electrode materials for battery applications. Although Li_1.2Nb_0.2V_0.6O₂ cannot be synthesized by conventional calcination method, a single phase and metastable oxide is successfully synthesized by high-energy mechanical milling. Electrode performance of metastable and nanosized Li_1.2Nb_0.2V_0.6O₂ is significantly improved by heat treatment at 600 °C. Heat treated Li_1.2Nb_0.2V_0.6O₂ with a partial cation ordered layered structure delivers a high reversible specific capacity of 320 mAh g⁻¹ on the basis of highly reversible two-electron redox of V ions. Moreover, inferior cyclability originating from the dissolution of V ions is successfully improved by using concentrate electrolyte solution, and over 90 % capacity retention is achieved after 50 cycles. This finding opens a new way to design high-capacity metastable Li-excess oxides for advanced Li-ion batteries with higher energy density.

Journal

• Electrochemistry

  Electrochemistry 90 (3), 037005-037005, 2022-03-16

  The Electrochemical Society of Japan

Keywords

• Li-excess Material
• Vanadium Oxide
• Metastable Oxide

Details

• CRID: 1390573242617128192
• NII Article ID: 130008145624
• DOI: 10.5796/electrochemistry.22-00005
• ISSN: 21862451
• ISSN: 13443542
• Web Site: https://www.jstage.jst.go.jp/article/electrochemistry/90/3/90_22-00005/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Allowed