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1、1LiFePO4performance2006-06-212OutlineWhatisLiFePO4?DischargecurveGSMdischargeHightemperatureStorageLowtemperaturedischargeCyclelifeOverchargeFireexposure3WhatisLiFePO4?LiFePO4isanewkindofpositivematerial.LiFePO4alsohasthefunctionthatreleaseorreceiveLi-ionlikeL
2、iCoO2.LiFePO4OlivinestructureFePO4OlivinestructureLiFePO4ChargeDischarge4DischargecurveLiFePO4hasthesamedischargecurveasLiCoO2.LiFePO4hasthelowerMPV(Mid-pointvoltage)thanLiCoO2.MPVofLiFePO4is3.1~3.2V,MPVofLiCoO2is3.6~3.7V.5GSMdischargeFollowingshowsGSMdischarg
3、ecurve(cutoffvoltageis2.8V).GSM1/0.2CGSM2/0.2C1#90.3%86.0%2#88.9%84.7%6HightemperatureStorageFollowingshowstorageresultsofLiFePO4andLiCoO2system.StorageconditionCapacitykeepingratio(capacityafterstorage/capacitybeforestorage)Capacityrecoveringratio(capacityaft
4、errecharge/capacitybeforestorage)60℃,7days85.2%92.8%85℃,48hours75.1%80.2%StorageconditionCapacitykeepingratio(capacityafterstorage/capacitybeforestorage)Capacityrecoveringratio(capacityafterrecharge/capacitybeforestorage)60℃,7days83.1%89.2%85℃,48hours72.5%79.3
5、%LiCoO2LiFePO47LowtemperaturedischargeFollowingshowsdischargeofdifferenttemperature.Temp.60℃/25℃45℃/25℃0℃/25℃-10℃/25℃-20℃/25℃ratio(%)93.498.272.664.245.48CyclelifeLiFePO4structurekeepsstablebeforeandafterdischarge,soithasgoodcyclelife.Basingonexperienceofother
6、projects,LiFePO4cyclelifecanbemorethan1000.OlivinestructureFePO4OlivinestructureLiFePO4ChargeDischarge9OverchargeLiFePO4hasgoodsafetyperformance.Followingshow1C/12Voverchargeresult.ConditionCellNo.Maxtemp.PhenomenaResult1C/12V260#117.10℃Swelling,ventopenlightl
7、y,nofire,noexplosion.Pass253#120.05℃Pass271#120.64℃Pass10OverchargeFollowingshow1C/12Voverchargecurveandcellphotos.BeforetestAftertest11OverchargeLiFePO4hasgoodsafetyperformance.Followingshow3C/32Voverchargeresult.ConditionCellNo.Maxtemp.PhenomenaResult3C/12V2
8、73#145.44℃Swelling,ventopenlightly,nofire,noexplosion.Pass12OverchargeFollowingshow3C/32Voverchargecurveandcellphotos.Aftertest13FireexposureLiFePO4hasgoodsafetyperformance.Followi
