电解液添加剂对硬碳掺杂电池性能的影响  

Effect of electrolyte additives on the performance of hard carbon doped battery

作　　者：靳卓 万柳 曾涛 薛有宝 JIN Zhuo;WAN Liu;ZENG Tao;XUE You-bao(Tianjin Lishen New Energy Technology Co.,Ltd.,Tianjin 300384,China)

机构地区：[1]天津力神新能源科技有限公司,天津300384

出　　处：《电池》2023年第6期639-642,共4页Battery Bimonthly

基　　金：国家重点研发计划项目(2019YFC1907800);天津市科技计划项目(20YFYSGX00050)。

摘　　要：为减少硬碳导致的容量损失及循环衰减,从比容量、直流内阻(DCIR)、倍率放电性能、高低温性能、高温存储性能和常温循环性能等方面,研究电解液中氟代碳酸乙烯酯(FEC)、硫酸乙烯酯(DTD)和甲烷二磺酸亚甲酯(MMDS)等添加剂对电池性能的影响。与基准电解液相比,单独添加2.0%FEC或1.5%DTD后,电池比容量分别降低4.4%或5.2%。1.0%FEC、1.5%DTD与0.5%MMDS搭配使用,比容量降低1.9%;1.0%FEC与1.5%DTD搭配使用,可改善电池容量低和循环衰减快等问题,比容量提升0.5%,45℃放电性能提升3.2%,60℃高温存储7 d,残余容量保持率和恢复容量保持率分别达到94.33%和96.77%,以额定功率在2.50~3.65 V常温循环360次,容量保持率提高1.5个百分点。In order to reduce the capacity loss and cycle decay caused by hard carbon,the effects of additives of vinyl fluorocarbonate(FEC),vinyl sulfate(DTD)and methyl methanesulfonate(MMDS)in the electrolyte on the battery performance were studied from the aspects of specific capacity,DC internal resistance(DCIR),rate discharge performance,high and low temperature performance,high temperature storage performance and room temperature cycle performance.Compared with the reference electrolyte,when FEC or DTD were added by 2.0%or 1.5%alone,the specific capacity of battery decreased by 4.4%or 5.2%,respectively.The use of 1.0%FEC,1.5%DTD and 0.5%MMDS together reduced the specific capacity by 1.9%.The combination of 1.0%FEC and 1.5%DTD could improve the problems of low capacity and fast cycle decay.The specific capacity increased by 0.5%,the discharge performance increased by 3.2%at 45℃,the residual capacity retention rate and recovery capacity retention rate stored at 60℃for 7 d reached 94.33%and 96.77%,respectively.After 360 cycles at rated power in 2.50-3.65 V at room temperature,the capacity retention rate increased by 1.5 percentage point.

关 键 词：磷酸铁锂(LiFePO_(4)) 硬碳 电解液 成膜添加剂 容量 

分 类 号：TM912.9[电气工程—电力电子与电力传动]