Molecular Orbital Principles of Oxygen-Redox Battery Electrodes

Masashi Okubo, Atsuo Yamada*

*この研究の対応する著者

研究成果: Article査読

105 被引用数 (Scopus)

抄録

Lithium-ion batteries are key energy-storage devices for a sustainable society. The most widely used positive electrode materials are LiMO2 (M: transition metal), in which a redox reaction of M occurs in association with Li+ (de)intercalation. Recent developments of Li-excess transition-metal oxides, which deliver a large capacity of more than 200 mAh/g using an extra redox reaction of oxygen, introduce new possibilities for designing higher energy density lithium-ion batteries. For better engineering using this fascinating new chemistry, it is necessary to achieve a full understanding of the reaction mechanism by gaining knowledge on the chemical state of oxygen. In this review, a summary of the recent advances in oxygen-redox battery electrodes is provided, followed by a systematic demonstration of the overall electronic structures based on molecular orbitals with a focus on the local coordination environment around oxygen. We show that a π-type molecular orbital plays an important role in stabilizing the oxidized oxygen that emerges upon the charging process. Molecular orbital principles are convenient for an atomic-level understanding of how reversible oxygen-redox reactions occur in bulk, providing a solid foundation toward improved oxygen-redox positive electrode materials for high energy-density batteries.

本文言語English
ページ(範囲)36463-36472
ページ数10
ジャーナルACS Applied Materials and Interfaces
9
42
DOI
出版ステータスPublished - 2017 10月 25
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)

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