锰
电化学
水溶液
阴极
插层(化学)
氧气
电池(电)
价(化学)
离子
动力学
无机化学
析氧
电极
材料科学
密度泛函理论
铝
化学工程
化学
计算化学
物理化学
热力学
冶金
复合材料
功率(物理)
有机化学
工程类
物理
量子力学
作者
Hongfang Gu,Xiaohu Yang,Song Chen,Wenming Zhang,Hui Ying Yang,Zhanyu Li
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-12-10
卷期号:23 (24): 11842-11849
标识
DOI:10.1021/acs.nanolett.3c03654
摘要
Aluminum-ion batteries have garnered an extensive amount of attention due to their superior electrochemical performance, low cost, and high safety. To address the limitation of battery performance, exploring new cathode materials and understanding the reaction mechanism for these batteries are of great significance. Among numerous candidates, multiple structures and valence states make manganese-based oxides the best choice for aqueous aluminum-ion batteries (AAIBs). In this work, a new cathode consists of γ-MnO2 with abundant oxygen vacancies. As a result, the electrode shows a high discharge capacity of 481.9 mAh g–1 at 0.2 A g–1 and a sustained reversible capacity of 128.6 mAh g–1 after 200 cycles at 0.4 A g–1. In particular, through density functional theory calculation and experimental comparison, the role of oxygen vacancies in accelerating the reaction kinetics of H+ has been verified. This study provides insights into the application of manganese dioxide materials in aqueous AAIBs.
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