期刊
NANO LETTERS
卷 17, 期 3, 页码 2034-2042出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00083
关键词
Rechargeable batteries; alloying reaction; carbon-encapsulation; yolk-shell structure; antimony
类别
资金
- Innovative Research Groups of the National Natural Science Foundation of China [NSFC51621001]
- National Key Research program of China [2016YFB0100305]
- National Natural Science Foundation of China Projects [51231003, 51622210, 21373195]
- Sofia Kovalevskaja award of the Alexander von Humboldt Foundation
- Fundamental Research Funds for the Central Universities [WK3430000004]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
In the current research project, we have prepared a novel Sb@C nanosphere anode with biomimetic yolk-shell structure for Li/Na-ion batteries via a nanoconfined galvanic replacement route. The yolk-shell microstructure consists of Sb hollow yolk completely protected by a well conductive carbon thin shell. The substantial void space in the these hollow Sb@C yolk-shell particles allows for the full volume expansion of inner Sb while maintaining the framework of the Sb@C anode and developing a stable SEI film on the outside carbon shell. As for Li-ion battery anode, they displayed a large specific capacity (634 mAh g(-1)), high rate capability (specific capabilities of 622, 557, 496, 439, and 384 mAh g(-1) at 100, 200, 500, 1000, and 2000 mA respectively) and stable cycling performance (a specific capacity of 405 mAh g(-1) after long 300 cycles at 1000 mA g(-1)). As for Na-ion storage, these yolk-shell Sb@C particles also maintained a reversible capacity of approximate 280 mAh CI at 1000 mA g(-1) after 200 cycles.
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