Preparation and electrochemical performances of Si/activated carbon composites

doi:10.19799/j.cnki.2095-4239.2020.0233

Abstract

Abstract:

Silicon/carbon (Si/C) composites were prepared from nano silicon and aniline by in-situ polymerization and carbonization. After further H₂O steam activation, the Si/AC composites were obtained. The microstructure and electrochemical performances of the as-prepared Si/AC composites were characterized by X-ray diffraction, N₂ isotherm adsorption, transmission electron microscopy, and galvanostatic chargedischarge measurement. The results show that when the activation temperature was 750°C and the activation time was 20 min, the obtained Si/AC composites showed a better high-rate and cycling performance than the Si/C composites. The specific capacities of the Si/AC 20 composites are 2860, 2482, 2212, and 1933 mA·h/g at the current densities of 100, 200, 300 and 500 mA/g. Moreover, the specific capacity is still as high as 1505 mA·h/g at the current density of 1000 mA/g. When the current density returns to 100 mA/g, the discharge specific capacity recovers to 2554 mA·h/g, with a capacity retention ratio of 89.3%.

Key words: Si/activated carbon composites, electrochemical performances, lithium-ion batteries

CLC Number:

O 646

Jin WANG, Jianquan WANG, Dianbo RUAN, Jiao XIE, Bin YANG. Preparation and electrochemical performances of Si/activated carbon composites[J]. Energy Storage Science and Technology, 2021, 10(1): 104-110.

Figures/Tables 8

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Table 1

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Fig.7

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样品名	活性物质重量	极片面密度	首次放电比容量	首次充电比容量	首次面容量	库仑效率/%
	/mg	/g·m^-2	/mA·h·g^-1	/mA·h·g^-1	/A·h·m^-2	第1周	第10周	第100周
Si	2.43	18.32	2055.96	1288.23	23.60	62.66	96.11	97.74
PANI-C	4.02	30.30	532.95	422.92	12.82	79.35	99.54	98.98
Si/C	4.05	30.53	2541.75	2042.97	62.37	80.38	97.39	98.32
Si/AC20	3.85	29.02	2996.23	2360.11	68.49	78.77	98.71	98.83
Si/AC60	3.72	28.04	1903.15	1354.57	37.98	71.18	98.13	98.57

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