PVP包覆对SiC复合材料结构及电化学性能影响  

Influence of PVP coating on structure and electrochemical performance of SiC composite anode

作　　者：范瑞娟 张大鹏 沈晓辉 曹国林 田占元 FAN Rui-juan;ZHANG Da-peng;SHEN Xiao-hui;CAO Guo-lin;TIAN Zhan-yuan(Shaanxi Coal and Chemical Technology Instiute Co.,Ltd.,New Energy Technology Department,Xi'an Shaanxi 710065,China)

机构地区：[1]陕西煤业化工技术研究院有限责任公司新能源技术研究所,陕西西安710065

出　　处：《电源技术》2018年第10期1477-1479,1495,共4页Chinese Journal of Power Sources

摘　　要：以PVP为有机包覆碳源,采用超声液相分散法制备具有高容量、高首效SiC复合材料。重点研究了PVP包覆比例对SiC复合材料结构及电化学性能影响。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)对复合材料物相组成和结构形貌进行表征。结果表明PVP包覆比例为3%时,得到的SiC复合材料具有最优电化学性能。以100 mA/g进行充放电,比容量达529 mAh/g,首次充放电效率88.5%,循环50周容量保持率92%。搭配三元正极材料(NCM)组装2 Ah软包全电池性能测试,电池容量发挥为1.94 Ah,0.5 C下循环100周容量保持率为94.6%,表现出优异的循环稳定性。High capacity and coulombit efficiency SiC compsite anode material was synthesized with PVP as coating agent by ultrasonic liquid dispersion method.The influence of the proportion PVP coating on structure and electrochemical performance was mainly studied.The samples were characterized by X-ray diffraction(XRD),scanning electron micros-copy(SEM).The results show that the optimal coating ratio of PVP is 3%,which behaves the best electrochemical performance.Charge and discharge at 100 mA/g,the initial discharge specific capacity of the sample is 529 mAh/g,the first charge and discharge efficiency is 88.5%,and the 50-week cycle capacity retention rate is 92%.At the test of the 2 Ah pouch cell which assembled by NCM as the cathode material and SiC coating PVP as the anode material,the real capacity of pouch cell is 1.92 Ah,after 100 cycles,the capacity retention ratio is 94.6%at 0.5C.Then the excellent cycle stability is exhibited.

关 键 词：硅碳负极材料 有机包覆 PVP 锂离子蓄电池 

分 类 号：TM912[电气工程—电力电子与电力传动]