Inorganic Chemicals Industry >
Preparation and process optimization of porous silicon anode materials for lithium-ion battery
Received date: 2023-07-26
Online published: 2024-05-15
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 CHF/(CH2O2+CHF) 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.
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 . DOI: 10.19964/j.issn.1006-4990.2023-0387
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