锂离子电池多孔硅负极材料制备及工艺优化

doi:10.19964/j.issn.1006-4990.2023-0387

Abstract

Abstract:

In order to improve the performance of silicon-based anode materials and reduce the preparation cost，porous silicon anode materials were prepared by metal-assisted chemical etching method using micron-grade silicon as raw material.The method showed the advantages of simple and controllable steps，low cost and easy large-scale generation.By means of field emission scanning electron microscopy and battery testing system，the morphology and properties of silicon anode materials prepared under different process parameters were compared and analyzed，so as to optimize the process.The results showed that the optimum technological parameters were as follows：AgNO₃ concentration was about 0.015 mol/L，reaction time of Galvani was 1~4 min，the C_HF/(C_H₂O₂+C_HF) in etching agent was 70%~90%.The electrochemical performance of porous silicon anode material prepared under suitable process parameters was obviously superior to that of silicon anode material.After 50 cycles at 0.5C，the capacity of porous silicon anode material was still 1 130.7 mA·h/g.Under 2C and 5C rate tests，there were still high specific capacities of 929 and 669 mA·h/g，respectively.The results showed that porous silicon anode materials could effectively alleviate the bulk expansion and poor conductivity of the monomeric silicon anode materials，thus effectively improving its electrochemical properties.

Key words: lithium-ion battery, anode material, porous silicon, metal-assisted chemical etching

CLC Number:

TM912

ZHAO Tianting, ZHU Delun, YANG Lin, ZHOU Xinlei. Preparation and process optimization of porous silicon anode materials for lithium-ion battery[J]. Inorganic Chemicals Industry, 2024, 56(5): 31-38.

Figures/Tables 15

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Table 1

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Table 2

Experimental parameters of samples with different concentration ratios of H2O2 and HF"

样品编号	m（Si）/g	伽伐尼反应/（10² mL）	金属辅助化学刻蚀/（10² mL）	$[C H F /$ $(C H 2 O 2 + C H F)$ ］/%
H	1	0.015 mol/L AgNO₃ +2 mol/L HF	0.35 mol/L H₂O₂+0.15 mol/L HF	30
I	1	0.015 mol/L AgNO₃ +2 mol/L HF	0.15 mol/L H₂O₂+0.15 mol/L HF	50
J	1	0.015 mol/L AgNO₃ +2 mol/L HF	0.064 mol/L H₂O₂+0.15 mol/L HF	70
K	1	0.015 mol/L AgNO₃ +2 mol/L HF	0.017 mol/L H₂O₂+0.15 mol/L HF	90

Table 2

Fig.12

Fig.13

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Preparation and process optimization of porous silicon anode materials for lithium-ion battery

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