人造石墨与硬碳复合对锂离子电池性能影响  

Effect of the Composite of Artificial Graphite and Hard Carbon on the Performance of Lithium-Ion Batteries

作　　者：裴德成 郭藩 马爱洁[1] PEI Decheng;GUO Fan;MA Aijie(College of Materials and Chemical Engineering,Xi’an Technological University,Xi’an 710021,China;Qingdao Tosda-huagin New Energy Technology Co.,Ltd.,Qingdao 266700,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021 [2]青岛泰达华云新能源科技有限公司,山东青岛266700

出　　处：《山东化工》2024年第22期46-50,共5页Shandong Chemical Industry

摘　　要：动力汽车的发展对锂离子电池充放电功率有更高要求,人造石墨其层间距(0.335 nm)较小,充放电倍率受到限制,而硬碳材料层间距(0.37~0.42 nm)具有优势,有利于提高充放电倍率。对人造石墨与硬碳进行复合,采用XRD、激光粒度分析、比表面积分析、SEM、半电池等方法,对人造石墨/硬碳复合材料进行分析,并组装成NCM523/复合材料体系锂离子电池进行电化学性能分析,评估复合材料对锂离子电池性能的影响。结果显示,人造石墨与硬碳复合后,3.0 C倍率充电恒流充入比例由80.07%提升至84.54%(添加10%硬碳),5.0 C倍率放电比例由88.52%提升至93.06%(添加20%硬碳),3.0 C倍率循环500周容量保持由83.38%提升至91.83%(添加10%硬碳)。The development of electric vehicles has put forward higher requirements for the charging and discharging power of lithium-ion batteries.Artificial graphite has a smaller interlayer spacing(0.335 nm),which limits its charge-discharge rate.However,the interlayer spacing of hard carbon(0.37~0.42 nm)has advantages,which is conducive to improving the charge-discharge rate.In this paper,the artificial graphite/hard carbon composites were analyzed by XRD,laser particle size analysis,specific surface area analysis,SEM and half cell,and the electrochemical performance analysis of the lithium-ion battery was assembled into a NCM523/composite material system to evaluate the effect of the composite materials on the performance of the lithium-ion batteries.The results show that after combining artificial graphite with hard carbon,the constant current charging ratio at a 3.0 C rate increases from 80.07%to 84.54%(with 10%hard carbon added),the discharge ratio at a 5.0 C rate increases from 88.52%to 93.06%(with 20%hard carbon added),and the capacity retention after 500 cycles at a 3.0 C rate increases from 83.38%to 91.83%(with 10%hard carbon added).

关 键 词：人造石墨 硬碳 锂离子电池 电化学性能 充电倍率 放电倍率 

分 类 号：TQ150[化学工程—电化学工业] TM912.9[电气工程—电力电子与电力传动]