非晶碳包覆石墨负极对锂电池快充性能的影响  

Effect of amorphous carbon coated graphite anode on fast charge performance of lithium battery

作　　者：蔡新辉 宋凯琳 郭明聪[2] 刘鑫荣 张莹 胡博 CAI Xin-hui;SONG Kai-lin;GUO Ming-cong;LIU Xin-rong;ZHANG Ying;HU Bo(Huzhou Qiyuan Jincan New Energy Technology Co.,Ltd.,Huzhou 313000,China;Sinosteel Anshan Research Institute of Thermo-energy Co.,Ltd.,Anshan 114044,China)

机构地区：[1]湖州启源金灿新能源科技有限公司,湖州313000 [2]中钢集团鞍山热能研究院有限公司,鞍山114044

出　　处：《炭素》2023年第4期1-6,共6页Carbon

摘　　要：新能源汽车缓慢的充电速度制约了其进一步推广。为满足市场的需求,亟需开发出具有快速充电能力的高性能锂离子电池,快充石墨负极也成为研究重点。本文选用石油针状焦为原料,经粉碎、石墨化处理得到石墨负极材料前驱体,采用液相包覆和碳化相结合的工艺,在石墨负极表面包覆一层非晶碳层,得到不同类型的非晶碳包覆的负极材料。通过对其进行微观结构的表征和电化学性能的测试,发现选用硬碳包覆的石墨负极材料表现出最优的快充与循环性能,这主要归因于其非晶碳层具有大层间距和乱层结构,有利于锂离子的快速嵌入与脱出,同时为锂离子提供更多的扩散通道,从而大幅提升石墨负极材料的快充性能,使其达到快充动力电池的要求。The slow charging speed of new energy vehicles limits their further spread.In order to meet the needs of the market,it is urgent to develop high-performance lithium-ion batteries with fast charging ability,and fast-charging graphite anode has become the focus of research.In this paper,petroleum needle coke was used as raw material,and the precursor of graphite anode material was obtained by grinding and graphitizing.A layer of amorphous carbon was coated on the surface of the graphite anode by a process combining liquid phase coating and carbonization,and different types of amorphous carbon coated anode materials were obtained.Through the microstructure characterization and electrochemical performance testing,it is found that the graphite anode material with hard carbon coating shows the best fast charging and cycling performance,which is mainly due to the large layer spacing and chaotic layer structure of its amorphous carbon layer,which is conducive to the rapid embedding and removal of lithium ions,and provides more diffusion channels for lithium ions.Thus,the fast charging performance of graphite anode material is greatly improved,so that it can meet the requirements of fast charging power batteries.

关 键 词：石墨 硬碳包覆 软碳包覆 快充性能 锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动]