电池BATTERYBIMONTHLY第53卷图6石墨/LiFePO4软包装电池的EISFig.6Electrochemicalimpedancespectroscopy(EIS)ofgra-phite/LiFePO4pouchbatteriesRCT仍保持较低状态,表明PhIS会在石墨负极表面形成富含硫元素的SEI膜,可提高离子电导率,有利于Li+迁移,降低电池阻抗。这说明,添加PhIS对电池高温存储前/后的DCR有较好的降低效果。3结论本文作者引入PhIS添加剂,以提高LiFePO4电池的高温存储性能、低温放电性能、DCR以及循环性能,发现0.5%PhIS添加量电池综合性能提升最均衡,1.0%PhIS添加量电池的低温放电和低温循环性能表现最优,此时,低温放电容量剩余率比未添加PhIS的提高了3.8%,DCR降低49mΩ。以0.2C充电、0.5C放电,在-10℃低温下、2.00~3.65V循环200次,电池容量保持率仍有88.1%。PhIS克服了LiFePO4电池低温循环性能差的问题,同时解决了VC添加剂带来的高阻抗问题,对LiFePO4电池各方面性能表现出积极的效果。参考文献:[1]殷志刚,王静,曹敏花.镍钴锰三元电池与磷酸铁锂电池性能对比[J].电池工业,2021,25(3):136-142.YINZG,WANGJ,CAOMH.Performancecomparisonbetweennickel-cobalt-manganeseternarybatteryandlithium-iron-phosphatebattery[J].ChineseBatteryIndustry,2021,25(3):136-142.[2]宋海申.LiFePO4/石墨动力电池高温循环失效研究[D].长沙:中南大学,2013.SONGHS.CapacityfadingofLiFePO4/graphitebatteriescycledatelevatedtemperature[D].Changsha:CentralSouthUniversity,2013.[3]吴弘,万华,王治安,等.VC劣化电解液高电压性能的原因探索[J].电池,2022,52(2):190-193.WUH,WANH,WANGZA,etal.ExploringthecausesofVCde-terioratinghighvoltageperformanceofelectrolyte[J].BatteryBi-monthly,2022,52(2):190-193.[4]王振,李保国.电池热管理系统散/加热特性研究及保温安全设计[J].包装工程,2022,43(11):174-182.WANGZ,LIBG.BatteryThermalmanagementsystemheatdissi-pation/heatingcharacteristicsresearchandheatpreservationsafetydesign[J].PackagingEngineering,2022,43(11):174-182.[5]LINYC,YUEXP,ZHANGH,etal.Usingphenylmethanesulfo-nateasanelectrolyteadditivetoimproveperformanceofLiNi0.5Co0.2Mn0.3O2/graphitecellsatlowtemperature[J].ElectrochimActa,2019,300:202-207.[6]CHOIW,SHINHC,KIMJM,etal.Modelingandapplicationsofelectrochemicalimpedancespectroscopy(EIS)forlithium-ionbat-teries[J].JElectrochemSciTechnol,2020,1...
