期刊
ACS NANO
卷 13, 期 11, 页码 13456-13464出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b07042
关键词
Ca2MnO4; material dissolution; solid electrolyte interface; cycle stability; aqueous zinc-ion battery
类别
资金
- National Natural Science Foundation of China [51972346, 51802356, 51932011, 51872334]
- Innovation -Driven Project of Central South University [2018CX004]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2017B045]
The issue of material dissolution is common in aqueous batteries, leading to serious performance deterioration. However, it is difficult to be solved so far. In this study, a single component cathode solid electrolyte interface (SEI) layer (CaSO4 center dot 2H(2)O) is observed via in situ electrochemically charging process, as demonstrated in a Ca2MnO4 cathode for an aqueous zinc-ion battery. Density functional theory calculation confirms its electronic insulation and ionic conductor properties, indicating that it is an appropriate SEI film. The material dissolution seems to be effectively suppressed by the presence of the SEI layer on the cathode side. Meanwhile, this in situ formed interface layer is advantageous for lowering impedance, ameliorating interface, and reducing activation energy. As a result, significantly superior rate performance and cycle stability are exhibited. The observation of a protective SEI layer in an aqueous system may provide an insight into the development of high stability aqueous batteries.
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