期刊
ACS NANO
卷 16, 期 4, 页码 6755-6770出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c01571
关键词
metal anodes; dendrite-free; separator; MXene; nanoporous oxides
类别
资金
- National Natural Science Foundation of China [51972198, 62133007]
- Taishan Scholars Program of Shandong Province [ts20190908]
- Natural Science Foundation of Shandong Province [ZR2020JQ19]
- Shenzhen Fundamental Research Program [JCYJ20190807093405503]
A novel MXene/nanoporous oxide heterostructure engineered separator is designed to stabilize zinc metal anodes and solve the dendrite issue. The zincophilic properties of the separator regulate zinc deposition and suppress side reactions, achieving dendrite-free zinc anodes with stable cyclability.
Aqueous zinc (Zn)-ion batteries are regarded as promising candidates for large-scale energy storage systems because of their high safety, low cost, and environmental benignity. However, the dendrite issue of Zn anode hinders their practical application. Herein, a freestanding, lightweight, and zincophilic MXene/nanoporous oxide heterostructure engineered separator is designed to stabilize a Zn metal anode. The nanoporous oxides prepared by a one-step vacuum distillation technique afford the advantages of large surface area, high porosity, and homogeneous porous structure. The zincophilic MXene@oxides layer can homogenize the electric field distribution, facilitate ion diffusion kinetics, reduce local current density, and promote even Zn ionic flux, which will regulate uniform Zn deposition and suppress side reactions. Accordingly, dendrite-free Zn anodes with stable cyclability are achieved for over 500 h at an ultrahigh area capacity of 10 mAh cm(-2). Besides, flexible, long-lifespan, and high-rate N/S-doped three-dimensional MXene@MnO2 parallel to Zn full cells are constructed with the engineered separator. Moreover, this strategy can be successfully extended to lithium, sodium, potassium, and magnesium metal batteries, indicating that separator regulation is a universal approach to overcome the challenges of metal batteries.
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