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Corresponding Author

Juan YANG(yangjuan@licp.cas.cn)

Abstract

Carbon layers with different thicknesses were introduced into the surfaces of silicon (Si) nanoparticles by sol-gel method using poly (cyclotriphosphazene-co-4, 4'-sulfonyldiphenol) as the carbon source. Technologies of X-ray diffraction, thermo-gravimetric analysis, Brunauer-Emmett-Teller and transmission electron microscopy were employed to analyze the structures and components of the as-prepared Si@CPZS composites. Electrochemical performance of Si@CPZS with different carbon thicknesses was studied. The results showed that Si@CPZS with carbon thickness of 10 nm possessed the best performance. Its capacity remained 940 mAh·g -1 after 290 cycles under 500 mA·g -1. As the addictive, the graphite-based anode contained 30% of Si@CPZS composite could achieve the specific capacity higher than 700 mAh·g -1.

Graphical Abstract

Keywords

Si@C, anode, lithium ion battery, addictive of graphite

Publication Date

2020-02-28

Online Available Date

2020-02-28

Revised Date

2019-03-22

Received Date

2019-02-26

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