Dissolution-Redeposition Mechanism of the MnO2 Cathode in Aqueous Zinc-Ion Batteries

被引：72
作者：
Wu, Tzu-Ho [1 ,2 ]
Lin, Ya-Qi [2 ]
Althouse, Zachary D. [1 ]
Liu, Nian [1 ]
机构：
[1] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA
[2] Natl Yunlin Univ Sci & Technol, Dept Chem & Mat Engn, Touliu 64002, Yunlin, Taiwan
来源：
ACS APPLIED ENERGY MATERIALS | 2021年 / 4卷 / 11期
基金：
美国国家科学基金会;
关键词：
in situ Raman microscopy; manganese oxides; reaction mechanisms; rechargeable zinc-ion battery; surface chemistry; PHASE-TRANSFORMATION; IN-SITU; CHEMISTRY; ELECTRODE; STABILITY; OXIDATION; STATES; MN3O4;
D O I：
10.1021/acsaem.1c02064
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A dissolution-redeposition reaction mechanism of the MnO2 cathode is directly visualized in rechargeable aqueous zinc-ion batteries via in situ Raman microscopy. MnO2 is reduced to Mn3+ during the discharge process, followed by a disproportionation reaction to form Mn2+ and Mn4+. The dissolved Mn2+ plays an important role in the battery chemistry. During the following charge process, the redeposition of Mn2+ forms a species with high Zn-content on the surface of the MnO2 cathode in the high-potential window. Moreover, an effective method that allows in operando observation of Jahn-Teller distortion of manganese is provided for the first time. This method uses in situ Raman microscopy to reveal the correlation between Jahn-Teller distortion and Mn-O bond length change.
引用
收藏
页码：12267 / 12274
页数：8
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