Electrochemical characteristics and charge-discharge mechanisms of Co-substituted Li5AlO4 as a novel positive electrode material

电化学 氧化还原 离子 化学 氧化物 电极 价(化学) 反应性(心理学) 电导率 无机化学 密度泛函理论 物理化学 计算化学 有机化学 病理 医学 替代医学
作者
Daisuke Okuda,Hiroaki Kobayashi,Masashi Ishikawa
出处
期刊:Solid State Ionics [Elsevier BV]
卷期号:353: 115374-115374 被引量:6
标识
DOI:10.1016/j.ssi.2020.115374
摘要

Modern and future products such as electric vehicles and hybrid electric vehicles require batteries with higher energy densities than that of conventional batteries. Anion redox-type active materials are proposed as a new high-capacity positive electrode material for Li-ion batteries with high energy density. We developed Li5AlO4 as an anion redox-type active material with a higher stability than that of Co-substituted Li2O. Li5AlO4 was substituted with Co by mechanical alloying with LiCoO2 to enhance its conductivity and its reactivity as an oxide anion. Co-substituted Li5AlO4 showed a slightly higher electron conductivity and a remarkably higher oxide anion reactivity than the as-prepared Li5AlO4. From electrochemical analysis, it was shown that Co-substituted Li5AlO4 had a reversible capacity of approximately 140 mAh g−1, while the as-prepared Li5AlO4 had no reversible capacity. According to the atomic valence of Co and Al and the partial structure for Co-substituted Li5AlO4 during the first charge-discharge cycle, we found that the charge capacity of Co-substituted Li5AlO4 is derived from the oxidation of oxide anions, the formation of peroxide and superoxide, and the fact that the partial structure of Co-substituted Li5AlO4 remains unchanged. These results indicate that the charge-discharge reaction of Co-substituted Li5AlO4 proceeds reversibly. Co-substituted Li5AlO4 demonstrates a relatively high specific capacity and good reversibility during the charge-discharge process.
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