石墨烯涂层铜箔集流体在硅基负极中的应用研究  

Application of graphene-coated current collectors in silicon-based negative electrodes

作　　者：金睿 周旭峰 刘兆平 JIN Rui;ZHOU Xufeng;LIU Zhaoping(School of Materials Science and Chemical Engineering,Ningbo University,Ningbo Zhejiang 315211,China;Ningbo Institute of Material Technology&Engineering(NIMTE),Chinese Academy of Science,Ningbo Zhejiang 315201,China)

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315211 [2]中国科学院宁波材料技术与工程研究所动力锂电池工程实验室,浙江宁波315201

出　　处：《电源技术》2024年第9期1698-1703,共6页Chinese Journal of Power Sources

摘　　要：针对硅基负极体积膨胀大,在电池循环过程中易从集流体上脱落的问题,提出了石墨烯涂层改性铜箔集流体的创新思路。石墨烯涂覆增加了集流体表面的粗糙度,从而使集流体与活性物质的粘附力增强,抑制硅基负极中集流体与活性物质脱离的现象发生。与使用商业铜箔集流体的电池相比,使用石墨烯涂层改性铜箔集流体的电池在倍率性能和循环稳定性方面均有明显提升。使用石墨烯涂层改性铜箔集流体的电池在2 C高倍率下,硅基负极放电比容量为467.2 mAh/g;在0.2 C循环80次后,容量保持率仍超过50%,而使用常规铜箔作为集流体的电池容量保持率仅为18.2%。This paper presents an original solution to the issue of the silicon-based negative electrode's high volume expansion and ease of detachment from the collector during battery cycling:a modified copper foil collector with graphene coating.The graphene coating makes the collector's surface rougher,which improves adhesion between the collector and the active material and prevents the phenomena of collector detachment from active material.The rate performance and cycle stability of batteries with modified collectors coated with graphene are significantly better than those with Cu foil collectors.At a high rate of 2 C,the silicon-based negative electrode with the improved collector covered with graphene had a discharge specific capacity of 467.2 mAh/g.After 80 cycles at 0.2 C,retention of capacity is still above 50%.In contrast,the one with normal copper foil collector only retained 18.2%of capacity.

关 键 词：硅基负极 铜箔集流体 石墨烯 锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动]