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Metastable and Nanosized Li1.2Nb0.2V0.6O2 for High-Energy Li-ion Batteries (Supporting Information)

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posted on 25.02.2022, 03:23 authored by Ruijie QI, Benoît D. L. CAMPÉON, Itsuki KONUMA, Yoshihiko SATO, Yuko KANEDA, Masashi KONDO, Naoaki YABUUCHI

A Li-excess cation-disordered rocksalt oxide, Li1.2Nb0.2V0.6O2, with higher theoretical capacity than traditional stoichiometric and layered oxides, is synthesized and tested as positive electrode materials for battery applications. Although Li1.2Nb0.2V0.6O2 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 Li1.2Nb0.2V0.6O2 is significantly improved by heat treatment at 600 °C. Heat treated Li1.2Nb0.2V0.6O2 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.

Funding

Development of New Solid State Ionics Materials through Design of Functional Interface

Japan Society for the Promotion of Science

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Study on Factors Affecting Reversibility of Anionic Redox Reaction for Rechargeable Battery Applications

Japan Society for the Promotion of Science

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Development of high capacity and durable electrode materials with less strain on electrochemical cycling

Japan Society for the Promotion of Science

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Ministry of Education, Culture, Sports, Science and Technology

Companhia Brasileira de Metalurgia e Mineração

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Corresponding author email address

yabuuchi-naoaki-pw@ynu.ac.jp

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© 2022 The Author(s)

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