电动汽车用磷酸铁锂动力电池的制作及性能测试_英文_概要VIP免费

ISSN1674-8484CN11-5904/U汽车安全与节能学报,2011年,第2卷第1期JAutomotiveSafetyandEnergy,2011,Vol.2No.1ManufactureandPerformanceTestsofLithiumIronPhosphateBatteriesUsedasElectricVehiclePowerZHANGGuoqing,ZHANGLei,RAOZhonghao,LIYong(FacultyofMaterialsandEnergy,GuangdongUniversityofTechnology,Guangzhou510006,ChinaAbstract:Owingtotheoutstandingelectrochemicalperformance,theLiFePO4powerbatteriescouldbeusedonelectricvehiclesandhybridelectricvehicles.AkindofLiFePO4powerbatteries,Cylindrical26650,wasmanufacturedfromcommercializedLiFePO4,graphiteandelectrolyte.Togetbatterieswithgoodhigh-currentperformance,theoptimalcontentofconductiveagentwasstudiedanddeterminedat8%ofmassfraction.Theelectrochemicalpropertiesofthebatterieswereinvestigated.Thebatterieshadhighdischargingvoltageplatformandcapacityevenathighdischargecurrent.Whendischargedat30Ccurrent,theycouldgiveout91.1%ofratedcapacity.Moreover,theycouldbefastchargedto80%ofratedcapacityintenminutes.Thecapacityretentionrateafter2000cyclesat1Ccurrentwas79.9%.Dischargetestsat-20℃and45℃alsoshowedimpressiveperformance.Thebatteryvoltage,resistanceandcapacityvariedlittleaftervibrationtest.Throughthesafetytestsofnail,noin?ammationorexplosionoccurred.Keywords:hybridandelectricvehicles;powerbatteries;lithiumironphosphate;lithiumionbatteries;电动汽车用磷酸铁锂动力电池的制作及性能测试张国庆、张磊、饶忠浩、李雍(广东工业大学材料与能源学院,广州510006,中国摘要:磷酸铁锂电池的优异性能使其可以应用在电动汽车和混合动力汽车上。用市售磷酸铁锂、石墨和电解液制作了圆柱型26650磷酸铁锂动力电池。为改善电池的大电流性能,研究了正极导电剂的最佳质量分数为8%。研究了所制备的动力电池的充放电性能。电池在高倍率下放电仍有较高的电压平台和放电容量。30C(96A放电时,可放出额定容量的91.1%。电池大电流充电性能较好,5C(16A充电10min左右,可充入额定容量的80%。1C充放电循环2000次,仍能保持额定容量的79.9%。高低温下电池放电性能良好。电池经过振动测试,内阻、电压和容量变化很小。针刺实验中没有发生起火和爆炸,电池温度峰值为94.7℃。关键词:混合动力汽车/电动汽车;动力电池;磷酸铁锂;锂离子电池中图分类号:TQ152收稿日期/Received:2010-12-13基金项目/Supportedby:TheResearchCooperationProjectofGuangdongProvinceandtheMinistryofEducation/广东省教育部产学研结合项目(2008B090500013第一作者/Firstauthor:张国庆(1963-,男(汉,河北,教授。E-mail:pdzgq008@126.com第二作者/Secondauthor:张磊,E-mail:rockyzhang2010@gmail.comIntroductionWiththedemandformorepowertosatisfytherapidlygrowingautomotivemarkets,focusisbeingdirectedatthelithiumionbatteries,whichhaveenergydensitiesexceeding130Wh·kg-1andcyclelifeofmorethan1000cycles.However,comparedwithtraditionalmarketslikelaptopsandcellularphones,newapplicationshavemuchhigherenergyandpowerrequirements.Intheseapplications,wheresafetyisofparamountimportance,10/1368—7169ZHANGGuoqing,etal:ManufactureandperformancetestsoflithiumironphosphatebatteriesusedaselectricvehiclepowertheuseofLiCoO2anditsderivativesraisesseriousconcernsfordevelopersbecauseofinherentthermalinstability.Theseinherentsafetylimitationshaveuntilnowpreventedlithiumionbatteriesfromenteringthelargeapplicationssuchaselectricandhybridelectricvehicles.Comparatively,iron-basedolivinephosphatehasbeenthefocusofresearch[1].LiFePO4hashightheoreticalcapacityof170mAh·g-1andanaveragevoltageofabout3.5Vvs.Li+/Li.Duetothelowcost,environmentalbenignity,excellentstructuralstability,longcyclinglifeandhighreversiblecapacity,lithiumironphosph...