期刊
CHEMICAL ENGINEERING JOURNAL
卷 351, 期 -, 页码 103-109出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.06.065
关键词
Yolk-shell structure; Self-sacrifice template; Polyethyleneimine (PEI); Lithium-ion batteries
资金
- National Natural Science Foundation of China [21601126]
- Shenzhen Science and Technology Project Program [JCYJ20170817100919133, KQJSCX20170327151152722]
- Natural Science Foundation of SZU [2017031, 827000039]
- Climbing Program Special Funds [pdjh2018b0436]
Due to its high specific capacity, silicon (Si) is considered as the most promising alternative anode material for high energy density lithium-ion batteries, but it suffers from dramatic volume expansion during the charge/discharge process. Fabricating yolk-shell structure is regarded as an essential way to improve the conductivity and cycle stability of Si-based anode. In this work, we proposed a self-sacrifice template strategy by using polyethyleneimine (PEI) to form the void space during carbonation without acid or base etching, which was different from the colloidal templates method. The yolk-shell structured silicon@void@carbon (Si@void@C) composites were synthesized to enhance cycle stability for lithium-ion batteries, which delivered a capacity of 854.1 mAh.g(-1) at the current density of 0.2 A.g(-1) after 200 cycles. Our work is also expected to be extended to the synthesis of other yolk-shell structured composites and the application in energy storage, catalysis, biomedicine and other fields.
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