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含LiDFOB的FEC/PC/DMC基电解液的高电压电化学性能
Authors
吕兴梅
张亮
+3 more
张兰
王轶博
陈仕谋
Publication date
1 January 2018
Publisher
Abstract
利用氟代碳酸乙烯酯(FEC)和二氟草酸硼酸锂(LiDFOB)优良的成膜性、稳定性和耐高压性,研究了在1 mol/L LiPF_6FEC/碳酸丙烯酯(PC)/碳酸二甲酯(DMC)中加入LiDFOB和三(三甲基硅烷)硼酸酯(TMSB)对高电压材料LiNi_(0.5)Mn_(1.5)O_4电化学性能的影响,利用循环伏安法和扫描电镜分析了两种电解液中电化学性能的差异.结果表明,在FEC基电解液中加入LiDFOB和添加剂TMSB使电解液的分解电位提高至5.5 V(vs.Li/Li~+)以上,对铝箔有良好的钝化作用.Li/LiNi_(0.5)Mn_(1.5)O_4半电池在含LiDFOB和TMSB的电解液中的初始放电比容量达126.8 mA·h/g,库伦效率为99%,充放电200次后比容量仍为108.2 mA·h/g,容量保持率为85.3%.而在不含LiDFOB和TMSB的电解液中,电池容量迅速衰减,85次充放电循环后容量保持率仅为60.7%
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Last time updated on 08/07/2019