机械法原位包覆制备纳米硅及其电性能研究  

In-situ coating preparation of nano-silicon by mechanical method and its electrical properties

作　　者：王毅杰 谢平波[1] 胡鑫 WANG Yijie;XIE Pingbo;HU Xin(School of Material Science and Engineering,South China University of Technology,Guangzhou Guangdong 510630,China)

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510630

出　　处：《电源技术》2022年第1期21-24,共4页Chinese Journal of Power Sources

摘　　要：硅负极由于其高比容量(4200 mAh/g)成为新型负极材料的主要选择。为获得电化学性能良好的纳米硅负极材料,以金属硅粉为原料,乙炔黑作为包裹材料,与人造石墨通过机械研磨工艺和原位包覆工艺合成了硅碳复合材料,组装成电池并测试材料的电化学性能。使用XRD、SEM、EDS、XPS分析表征了复合材料的结构和组成,使用激光粒度分析对制备的纳米硅颗粒的粒径进行表征,并用红外光谱分析分散剂在颗粒表面的原位包覆效果。将复合材料制备成纽扣电池进行测试,在1 C(900 mA/g)的充放电倍率下经过100个循环,仍然具有590.8和649.1 mAh/g的放电比容量。Silicon anode has become the main choice for new anode materials due to its high specific capacity(4200 mAh/g).In order to obtain a nano-silicon anode material with good electrochemical performance,Si@C composite was synthesized by mechanical grinding process and in-situ coating process with metal silicon powder as raw material,acetylene black as a wrapping material.Then assemble it into a button battery to test its electrochemical performance.XRD,SEM,EDS and XPS were used to characterize the structure and composition of Si@C composite,laser particle size analysis was used to characterize the particle size of Si@C composite,and FTIR was used to analyze the in-situ coating effect of the dispersant on the particle surface.The composite material was prepared into a button battery for testing.After 100 cycles at a rate of 1 C(900 mA/g),it still has a specific discharge capacity of 590.8 mAh/g and 649.1 mAh/g.

关 键 词：硅碳负极 机械研磨 原位包覆 

分 类 号：TM912[电气工程—电力电子与电力传动]