2023.3Vol.47No.3研究与设计收稿日期:2022-08-22基金项目:科技部2018新能源汽车重点专项(2018-YFB0104100)作者简介:王坤(1989—),女,河南省人,工程师,硕士,主要研究方向为动力电池。通信作者:王力臻,E-mail:wlz@zzuli.edu.cn氧化石墨烯改性LiFePO4正极材料的电化学性能王坤1,昝振峰1,李龙1,王力臻2(1.宇通客车股份有限公司,河南郑州450016;2.郑州轻工业大学材料与化工学院,河南郑州450002)摘要:采用球磨法制备不同氧化石墨烯添加量的LiFePO4/GO复合材料,研究氧化石墨烯添加量对LiFePO4正极锂离子电池性能的影响。通过XRD、SEM、FTIR、XPS和相关的电化学方法研究了材料的物理和电化学性能。结果表明,球磨法制备LiFePO4/GO复合材料不改变LiFePO4的物性,与纯LiFePO4相比,LiFePO4/GO复合材料表现出更好的高倍率性能和循环稳定性。其中LiFePO4与GO质量比为100∶1.25时,GO-1.25混合材料在0.5C放电倍率下循环100次后显示出154.9mAh/g的放电比容量,其容量保持率为98.7%。关键词:球磨法;氧化石墨烯;LiFePO4/GO中图分类号:TM912文献标识码:A文章编号:1002-087X(2023)03-0287-04DOI:10.3969/j.issn.1002-087X.2023.03.003ElectrochemicalperformanceofLiFePO4cathodematerialmodifiedbygrapheneoxideWANGKun1,ZANZhenfeng1,LILong1,WANGLizhen2(1.YutongBusCo.,Ltd.,ZhengzhouHenan450016,China;2.SchoolofMaterialandChemicalEngineering,ZhengzhouUniversityofLightIndustry,ZhengzhouHenan450002,China)Abstract:TheLiFePO4/GOcompositeswithdifferentGOcontentswerepreparedbyballmilling.TheeffectofgrapheneadditionontheenergystorageperformanceofLiFePO4/GOlithium-ionbatterycathodematerialwasstudied.ThephysicalandelectrochemicalpropertiesoftheLiFePO4/GOcompositeswereinvestigatedbyXRD,SEM,FTIR,XPSandrelatedelectrochemicalmethods.TheexperimentalresultsshowthatthephysicalpropertiesofLiFePO4intheLiFePO4/GOcompositepreparedbyballmillingdonotchangecomparedwithpureLiFePO4.TheLiFePO4/GOcompositeexhibitsmuchbetterhigh-rateperformanceandcyclingstability.WhenthemassratioofLiFePO4/grapheneby100∶1.25,thedischargespecificcapacityoftheGO-1.25compositeisabout154.9mAh/gafter100cyclesat0.5C,thecapacityretentionofthecompositeis98.7%.Keywords:ball-millingmethod;grapheneoxide;LiF...