化工新型材料

化工新型材料 ›› 2023, Vol. 51 ›› Issue (4) : 170-174. DOI: 10.19817/j.cnki.issn1006-3536.2023.04.030

科学研究

预锂化在SiO_x@C负极材料中的应用研究

作者信息 +

Application of prelithiation in SiO_x@C anode material

Zhang Zhengyu, Bai Zhe, He Jielong, Wu Jiani, Lan Lifang, Li Jun

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文章历史 +

Received		Published
2021-12-27		2023-04-20
Issue Date	Revised Date
2023-04-27	2021-12-27

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摘要

通过正硅酸乙酯水解、蔗糖热解包覆制备了锂离子电池SiO_x@C负极材料。为了减少SiO_x@C在首次循环中的不可逆容量损失,采用SiO_x@C与金属锂片直接接触的方法对其进行预锂化,考察了不同预锂化处理时间对材料电化学性能的影响,研究了预锂化处理前后材料表面形貌和组成成分的变化,分析了预锂化处理在材料中的作用机理。结果表明,预锂化处理3min后,SiO_x@C的首次库伦效率已达到99.2%,高于未预锂化的63.9%,而且仍然表现出较高的循环稳定性。通过SEM、XPS、容量微分曲线、交流阻抗谱等分析,发现预锂化处理过程中SiO_x@C已发生不可逆转化反应,并在材料表面形成了SEI膜,从而达到减少首次循环中不可逆容量损失的目的。

Abstract

SiO_x@C anode material for lithium-ion batteries was prepared by hydrolysis of ethyl orthosilicate and pyrolysis of sucrose.In order to reduce irreversible capacity loss of the SiO_x@C in the first cycle,we used the method of direct contact between the SiO_x@C@C and the metal lithium sheet to achieve the purpose of prelithiation.The influence of different prelithiation treatment time on the electrochemical performance of SiO_x@C@C was investigated.The changes of the surface morphology and composition of SiO_x@C@C before and after prelithiation were studied.The mechanism of prelithiation in SiO_x@C was analyzed.The results indicated that the initial Coulombic efficiency of the SiO_x@C with a prelithiation treatment of 3min reached 99.2%,which was much higher than the 63.9% of the SiO_x@C without prelithiation.The prelithiated SiO_x@C also exhibited high cycle stability.SEM,XPS,dQ/dV curves,EIS analyses showed that the SiO_x@C had undergone an irreversible conversion reaction and formed SEI film on its surface during prelithiation process,thereby achieving the purpose of reducing the irreversible capacity loss in the first cycle.

关键词

锂离子电池 / SiO_x@C负极材料 / 预锂化 / 不可逆容量 / 首次库伦效率

Key words

Lithium-ion batteries / SiO_x@C anode material / prelithiation / irreversible capacity / initial coulombic efficiency

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预锂化在SiO_x@C负极材料中的应用研究[J]. 化工新型材料, 2023, 51(4): 170-174 DOI:10.19817/j.cnki.issn1006-3536.2023.04.030

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