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Si/C 复合锂离子电池负极材料的制备及其性能
Preparation and properties of negative electrode materials for Si/C composite lithium ion batteries
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- DOI:
- 作者:
- 孙亚萍
Sun Yaping
- 作者单位:
- 朔州职业技术学院，山西朔州036000
ShuoZhou Vocational Technology College, Shuozhou 036000, China
- 关键词:
- 球磨处理；压实处理；Si/C 复合锂离子电池负极；放电容量；库伦效率
ball milling treatment; compaction treatment; Si/C lithium-ion battery cathode; discharge capacity; coulomb efficiency
- 摘要:
- 摘要：从电池性能的角度出发，合理设计电池负极材料是必要的，为此提出Si/C 复合锂离子电
池负极材料的制备及电化学性能分析研究。准备实验材料和仪器后，分别按照Si：石墨为
1：9、2：8、3：7 和4：6 的比例准备混合料，按照料液比1：4 加入无水乙醇作为球磨介质，在球磨
机中进行球磨处理，干燥后得到Si 含量分别为10%、20%、30% 和40% 的复合材料；按照质量
比为90：5：2：3 的比例活性物质（Si/C 复合材料）、导电剂碳黑、分散剂乙二醇和粘结剂PVDF
配置浆料，涂抹于锂箔表面，经热压成型机对极片进行压实处理，得到Si/C 复合锂离子电池负
极。在采用电池测试系统在100 mA/g 下对硅含量分别为10%、20%、30% 和40% 的复合材料
电极电化学性质进行测试，得出结论Si/C 复合锂离子电池负极材料的放电容量受硅含量影响
明显，并且不存在直接的线性相关关系；硅含量也会影响Si/C 复合锂离子电池负极材料的库
伦效率，过高或高低都会导致库伦效率下降。
Abstract: From the point of view of battery performance, it is necessary to reasonably design negative electrode materials for battery
and carry out study on the preparation and electrochemical performance analysis of Si/C composite lithium ion battery negative
electrode materials. After preparing the experimental materials and instruments, the mixture was prepared according to the ratio of
Si: graphite as 1:9, 2:8, 3:7 and 4:6, and anhydrous ethanol was added as the ball milling medium according to the ratio of material
to liquid as 1:4, and then the composite material with Si content of 10%, 20%, 30% and 40% was obtained after drying. According
to the mass ratio of 90:5:2:3 ratio of active material (Si/C composite), conductive agent carbon black, dispersant glycol and binder
PVDF, the slurry was applied on the surface of lithium foil, compacted the electrode sheet by a hot pressing machine to obtain the
negative electrode of Si/C composite lithium ion battery. The electrochemical properties of composite electrodes with silicon content
of 10%, 20%, 30% and 40% were tested by a battery test system at 100 mA/g, and it was concluded that the discharge capacity of
Si / C composite lithium-ion battery anode materials was obviously affected by silicon content, and there was no direct linear
correlation. Silicon content will also affect the coulomb efficiency of Si/C composite lithium-ion battery anode materials, too high or
high will lead to a decrease in coulomb efficiency.