Preparation and electrochemical performance of high initial coulombic efficiency and long life Si/C composite material

doi:10.19799/j.cnki.2095-4239.2020.0086

Abstract

Abstract:

Through layer-layer coating and series chemical reaction, the sandwich structure of SiO@C@Al₂O₃and Li-Si-O@C@LiAlO₂ was prepared by using SiO, pitch, aluminum nitrate and LiH as the main raw materials. The morphology and the phase structure of the samples were characterized by SEM, TEM, XRD and laser particle size analyzer. It was adopted by CR2032 cell to evaluate the reversible capacity, initial coulombic efficiency and capacity retention of different products. The results showed that compared with the common SiO@C, the modified SiO@C@Al₂O₃and Li-Si-O@C@LiAlO₂ composites had excellent electrochemical performance in initial Coulombic efficiency and capacity retention. This preparation was simple operation, low cost and suitable for industrial production.

Key words: SiO@C, Al₂O₃ coating, LiAlO₂, pre-lithiated, lithium ion battery

ZHANG Gang, LIU Xingwen, ZHANG Fan, CHEN Zhiwei. Preparation and electrochemical performance of high initial coulombic efficiency and long life Si/C composite material[J]. Energy Storage Science and Technology, 2020, 9(3): 826-830.

Figures/Tables 6

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Table 1

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Table 2

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不同样品	D10/μm	D50/μm	D90/μm	D99/μm
SiO	2.77	5.96	8.58	11.37
SiO@C	3.93	7.94	14.61	21.22
SiO@C@Al₂O₃	4.81	8.36	14.58	20.98

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