Influence of different carbon contents on the electrochemical performance of SiO/C anode

doi:10.19799/j.cnki.2095-4239.2023.0184

Abstract

Abstract:

Carbon coating is essential for the performance of SiO anode materials; however, the intrinsic link between carbon content and electrode electrochemical performance has not been studied in depth. Herein, SiO/C anode materials with different carbon contents were prepared using chemical vapor deposition (CVD) technology. The study found that when the carbon content was about 5%, the electrochemical performance of the composite materials was the best because they had a fast lithium-ion transport channel. Further research found that when the carbon content of the CVD process continued to increase, carbon materials with disordered structures accounted for a large proportion. Although the electrical conductivity was improved, the gaps originally available for lithium-ion transport were heavily blocked, which greatly affected the kinetic reaction rate of the electrode. The prepared SiO/C-2 electrode showed excellent cycling performance, with a reversible capacity of 1350 mAh/g after 100 cycles.

Key words: silicon oxide, carbon, anode, electrochemistry, interface, chemical vapor deposition

CLC Number:

TM 911.1

Shenran ZHANG, Lihuan XU, Chang SU. Influence of different carbon contents on the electrochemical performance of SiO/C anode[J]. Energy Storage Science and Technology, 2023, 12(6): 1784-1793.

Figures/Tables 15

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Table 1

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样品名称	首次放电比容量 /(mAh/g)	首次充电比容量 /(mAh/g)	首次库仑效率 /%
SiO/C-1	2044.7	1549.9	75.80
SiO/C-2	2233.1	1698.1	76.04
SiO/C-3	2485.4	1895.8	76.28
SiO/C-4	2307.5	1752.7	75.96

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