Choice for graphene as conductive additive for cathode of lithium-ion batteries

作     者：Ying Shi Lei Wen Songfeng Pei Minjie Wu Feng Li Ying Shi;Lei Wen;Songfeng Pei;Minjie Wu;Feng Li

作者机构：Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2019年第28卷第3期

页      面：19-26页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 07[理学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financial support from the Strategic Priority Reasearch Program of Chinese Academy of Sciences(No.XDA09010104) National Natural Science Foundation of China(Nos.51525206,51521091,51372253 and U1401243) the MOST of China(Nos.2016YFB0100100 and 2014CB932402) 

主　　题：Graphene Conductive additive Lithium-ion batteries LiCoO2 cathode 

摘      要：Graphene is a promising conductive additive for the lithium-ion batteries(LIBs) and shows great potential especially with its fast development of the large scale fabrication technology. This work has explored the influence of the incorporation of graphenes prepared by three typical methods on the electrochemical performance of the LiCoO_2-based cathode focusing on the choice for the effective graphene as conductive additive for the cathode of LIBs. Through the comparison of the intrinsic characteristics of graphenes and the electrochemical performance of electrodes with graphene, it is found that graphene with low disorder degree and large size is not suitable for LiCoO_2 cathodes as conductive additive. Conversely, the graphene with oxygen functional groups, relatively low surface area and proper size displays much better electrochemical performance when it is used as conductive additive. This work also demonstrates the transmission mechanism for different graphenes as conductive additives in the LiCoO_2 materials, and further reveals that the conductivity of graphene is not the only factor as conductive additives, surface chemistry and sheet size of the graphene are also essential factors which greatly influence the electrochemical performance of electrode. In addition, when combined with Super P, only 1% graphene is enough to construct an efficient conductive network in the electrode. This study also gives a new sight on the practical application of graphene as conductive additive for high performance LIBs.