期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 9, 期 3, 页码 1541-1551出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta10301b
关键词
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资金
- Natural Science Foundation of China [21875154, 21875156]
- Ministry of Science and Technology of the People's Republic of China [2015AA034601]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [BK20190829]
By creating a supramolecular buffer layer on the surface of Si particles, the electrochemical performance of an Si anode using a PVDF binder has been significantly improved, particularly in terms of initial coulombic efficiency, high rate capability, and cycling stability.
In the past 20 years, PVDF binders have been excluded for use with Si anodes due to their very poor electrochemical performance. To overcome this fundamental challenge, we propose a novel strategy of creating a functional buffer layer on the Si particle surface, i.e. a supramolecular layer of nickel iontrimesic acid. The layer is able to protect Si particles and isolate Si from the PVDF chain. The applied supramolecular buffer layer not only coherently bonds with the Si core, but also promotes the formation of a stable SEI layer. As a result, an Si anode using a PVDF binder exhibits much improved initial coulombic efficiency, high rate capability and excellent cycling stability. After 200 electrochemical cycles, a reversible capacity of 1900.6 mA h g(-1), corresponding to a capacity retention of 92%, is obtained, which is in sharp contrast to the almost zero capacity for a reference Si anode. The successful use of a traditional PVDF binder with an extremely high capacity Si anode provides a new avenue for the development of Si anodes for high-energy-density lithium-ion batteries.
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