期刊
ACS NANO
卷 7, 期 4, 页码 3627-3634出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn400601y
关键词
Na-ion batteries; Sn nanoforest anodes; nanohierarchy; tobacco mosaic virus; physical vapor deposition; magnetron sputtering
类别
资金
- U.S. Army Research Laboratory
- Nanostructures for Electrical Energy Storage, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001160]
Designed as a high-capacity alloy host for Na-ion chemistry, a forest of 5n nanorods with a unique core-shell structure was synthesized on viral scaffolds, which were genetically engineered to ensure a nearly vertical alignment upon self-assembly onto a metal substrate. The interdigital spaces thus formed between individual rods effectively accommodated the volume expansion and contraction of the alloy upon sodiation/desodiation, while additional carbon-coating engineered over these nanorods further suppressed Sn aggregation during extended electrochemical cycling. Due to the unique nanohierarchy of multiple functional layers, the resultant 3D nanoforest of C/Sn/Ni/TMV1cys, binder-free composite electrode already and evenly assembled on a stainless steel current collector, exhibited supreme capacity utilization and cycling stability toward Na-ion storage and release. An initial capacity of 722 mA.h (g Sn)(-1) along with 405 mA.h (g Sn)(-1) retained after 150 deep cycles demonstrates the longest-cycling nano-Sn anode material for Na-ion batteries reported in the literature to date and marks a significant performance improvement for neat Sn material as alloy host for Na-ion chemistry.
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