期刊
ENERGY TECHNOLOGY
卷 7, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201800912
关键词
core-shell structures; cycling performances; dendrites; leaching; Zn-MnO2 alkaline batteries
资金
- Beijing Municipal Science and Technology Project [Z161100001116080]
- National Key Scientific Instrument and Equipment Development Projects [2014YQ090709]
- 2011 Collaborative Innovation Center of Green Printing & Publishing Technology (CGPT)
- cross-training plan for high level talents in Beijing colleges and universities, NSFC [41473020]
- Major Project of the Ministry of Science and Technology [2016YFA0200904]
Rechargeable zinc-based aqueous batteries are a promising candidate for next-generation energy storage devices because of the high theoretical energy density of Zn as well as the availability, safety, and cheap price of Zn-based aqueous batteries. A Zn@C core-shell composite is designed to overcome two problems of Zn anodes, that is, the formation of Zn dendrites and the corrosion/loss of Zn anode during the charge-discharge process, influencing the lifetime of Zn-based aqueous batteries. The prepared Zn@C composite from ZnO@C with electrochemical reduction is robust as the anode for a Zn@C//MnO2 battery, and a 98.8% retention after 400 cycles is obtained at a discharge rate of 5 C. The specific capacitance of Zn@C//MnO2 battery can reach 135 mAh g(Zn)(-1) at 3 C, and the energy density of this battery can reach 75.9 Wh Kg(-1). The coated carbon layer on Zn/ZnO plays a role in protecting Zn/ZnO from leaching or corrosion by KOH, so the structure of Zn@C is a key factor in improving the cycling lifetime of Zn-based aqueous batteries.
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