压实密度对锂离子电池硅碳负极性能影响研究  

Research on the influence of compaction density on the performance of silicon/carbon negative electrodes in lithium-ion batteries

作　　者：陈宪刚 单颖会 吴涛 林双 战祥连 CHEN Xiangang;SHAN Yinghui;WU Tao;LIN Shuang;ZHAN Xianglian(Qingdao Second Military Representative Office of Navy,Qingdao Shandong 266011;Zibo Torch Energy Co.,Ltd.,Zibo Shandong 255056,China)

机构地区：[1]海装驻青岛地区第二军事代表室,山东青岛266011 [2]淄博火炬能源有限责任公司,山东淄博255056

出　　处：《蓄电池》2024年第6期251-257,共7页Chinese LABAT Man

摘　　要：研究了涂层压实密度分别为1.2、1.4、1.6 g/cm^(3)的硅碳负极性能,并且总结了压实密度对硅碳负极性能影响的规律。随着涂层压实密度提高,电池传荷阻抗降低,硅碳负极锂离子电池的5C倍率放电容量增大。同时,增大负极压实密度能够提高硅碳负极材料的循环稳定性,从而提高电池循环寿命和平均库伦效率。另一方面,由于压实密度越高,负极内部孔径及孔隙度越小,电解液对活性物质浸润程度越差,极片涂层中活性物质的活性位点就越少。因此,在0.1C和1C倍率条件下首次循环放电容量(或比容量)和库伦效率随负极压实密度增加而降低。The performance of silicon/carbon negative electrodes with coating compaction densities of 1.2,1.4,and 1.6 g/cm^(3)are studied,and summarized the influence of compaction density on the performance of silicon/carbon negative electrodes.The 5C rate discharge capacity of silicon/carbon negative electrode lithium-ion batteries increases with the increase of coating compaction density.This is because as the compaction density increases,the charge transfer impedance of the battery decrease.Meanwhile,increasing the compaction density of the negative electrode can improve the cycling stability of silicon/carbon negative electrode materials,thereby improving the battery cycling life and average Coulombic efficiency.On the other hand,under the conditions of 0.1C and 1C rate,the first cycle discharge capacity/specific capacity and Coulombic efficiency decrease with the increase of negative electrode compaction density.This is because the higher the compaction density,the lower the internal pores and porosity of the negative electrode,and the worse the wetting degree of the electrolyte on the active substance,the fewer active sites of active substances in the polar coating.

关 键 词：涂层 压实密度 硅碳负极 锂离子 电池 比容量 库伦效率 活性位点 

分 类 号：TM912.2[电气工程—电力电子与电力传动]