锂电池纳米Si-石墨负极材料表面改性试验研究  

Experimental Study on Surface Modification of NanoSi-Graphite Anode Materials for Lithium Batteries

作　　者：姜成龙 张良 张晋杰 Jiang Chenglong;Zhang Liang;Zhang Jinjie(Test&Certification Department,China Automotive Technology&Research Center,Tianjin 300000)

机构地区：[1]中国汽车技术研究中心检测认证事业部,天津300000

出　　处：《汽车工艺与材料》2021年第9期10-14,共5页Automobile Technology & Material

摘　　要：介绍了一种对电动汽车锂离子动力电池负极材料纳米Si和石墨表面进行改性试验的研究方法,并对改性后材料的结构特征和电化学性能进行详细分析。结果表明改性后的纳米硅-石墨负极材料具有了更稳定的充放电循环性能和电化学性能,通过对不同条件下进行试验的材料进行对比分析,可以得出将NanoSi和球磨石墨分别氧化改性混合而成的复合材料,极片经300℃热处理后,循环性能十分优异,充放电100个循环后放电容量仍达553.1 mA·h/g。这为纳米硅在锂离子电池负极材料上的实际应用提供了很好的研究思路,展现了纳米硅负极锂离子动力电池在电动汽车市场上的应用前景。This article introduces a research method for modifying the surface of NanoSi and graphite anode material for electric vehicle lithium-ion power batteries,and analyzes in detail structural characteristics and electrochemical performance of the modified material.Results show that the modified NanoSi-graphite anode material has more stable charge-discharge cycle performance and electrochemical performance.The material is tested and analyzed under different conditions,a composite material made of NanoSi and ball-milled is obtained after being oxidized and modified.After being heat-treated at 300℃,the cycle performance of the composite material is very good,after 100 cycles of charge and discharge,the discharge capacity still reaches 553.1 mA·h/g.This provides a good research approach for the practical application of nano-silicon on lithium-ion battery anode materials,and also shows the application prospect of nano-silicon anode lithium-ion power batteries on the electric vehicle market.

关 键 词：电动汽车 动力电池 硅负极 硅碳复合 改性 

分 类 号：U465.6[一般工业技术—材料科学与工程]