使用新型电解液的磷酸铁锂电池高低温性能
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摘要
在某商用锂离子电池电解液(CE)中加入双草酸硼酸锂(Li BOB)和氟代碳酸乙烯酯(FEC)制备了一种电解液(WY)。对使用WY电解液的18 Ah磷酸铁锂/石墨动力电池进行高低温电性能测试,并与使用CE电解液的同规格LiFePO_4电池高低温数据进行了对比。结果表明:与商用电解液相比,使用WY电解液的电池在25℃不同倍率下放电容量均高于商用电解液电池。WY电池在-20℃低温下0.1 C和0.2 C放电容量增加了16.0%和15.8%。WY电池-20℃与室温下的放电容量高于CE电池。在-40℃低温下,WY电池性能优于CE电池。在60℃高温下,使用WY电解液的电池性能优于使用CE电解液的电池性能。
A novel electrolyte(noted as WY)was designed by adding Li BOB salt and FEC to a commercial electrolyte(named as CE)for high/low temperature application of a LiFePO_4/artificial graphite batteries.Two 18 Ah LiFePO_4/artificial graphite cells with WY and CE electrolyte were investigated by discharge capacity test at different temperatures and the results were compared.The results show that the discharge capacity of WY cell at room temperature is higher than that of CE cell at various rates.The discharge capacity of WY cell increases by 16.0% and 15.8% at 0.1 C and 0.2 C rate comparing to CE cell at -20℃.Relative capacity at -20℃(related to capacity at 25℃)of WY cell is higher than that of CE cell at 0.1 C and 0.2 C.Also WY cell has better performance even at -40℃.At 60℃,WY cell has more discharge capacity than CE cell.
A novel electrolyte(noted as WY)was designed by adding Li BOB salt and FEC to a commercial electrolyte(named as CE)for high/low temperature application of a LiFePO_4/artificial graphite batteries.Two 18 Ah LiFePO_4/artificial graphite cells with WY and CE electrolyte were investigated by discharge capacity test at different temperatures and the results were compared.The results show that the discharge capacity of WY cell at room temperature is higher than that of CE cell at various rates.The discharge capacity of WY cell increases by 16.0% and 15.8% at 0.1 C and 0.2 C rate comparing to CE cell at -20℃.Relative capacity at -20℃(related to capacity at 25℃)of WY cell is higher than that of CE cell at 0.1 C and 0.2 C.Also WY cell has better performance even at -40℃.At 60℃,WY cell has more discharge capacity than CE cell.
引文
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[2]ZHANG W.Structure and performance of LiFePO4cathode materials:A review[J].Journal of Power Sources,2011,196:2962.
[3]WANG J,TANG Y,YANG J.Nature of LiFePO4aging process:Roles of impurity phases[J].Journal of Power Sources,2013,238:454.
[4]ZHANG Z,ZHAO X,PENG B,et al.Mixed salts for lithium iron phosphate-based batteries operated at wide temperature range[J].Transactions of Nonferrous Metals Society of China,2015,25:2260.
[5]ZHANG S S,XU K,JOW T R.An improved electrolyte for the LiFePO4cathode working in a wide temperature range[J].Journal of Power Sources,2006,159:702.
[6]TAN L,ZHANG L,SUN Q,et al.Capacity loss induced by lithium deposition at graphite anode for LiFePO4/graphite cell cycling at different temperatures[J].Electrochimica Acta,2013,111:802.
[7]SONG H,CAO Z,ZHANG Z.Effect of vinylene carbonate as electrolyte additive on cycling performance of LiFePO4/graphite cell at elevated temperature[J].Transactions of Nonferrous Metals Society of China,2014,24:723.
[8]CHANG C C,LEE K Y,LEE H Y.Trimethyl borate and triphenyl borate as electrolyte additives for LiFePO4cathode with enhanced high temperature performance[J].Journal of Power Sources,2012,217:524.
[9]KJELL M H,MALMGREN S,CIOSEK K.Comparing aging of graphite/LiFePO4cells at 22℃and 55℃electrochemical and photoelectron spectroscopy studies[J].Journal of Power Sources,2013,243:290.
[10]LIAO L,CHENG X,MA Y.Fluoroethylene carbonate as electrolyte additive to improve low temperature performance of LiFePO4electrode[J].Electrochimica Acta,2013,87:466.