高比能磷酸铁锂电池电解液浸润性能改善研究  

Improvement of electrolyte wettability of high specific energy LiFePO4 battery

作　　者：秦凯[1] 孙新华[1] 杨良君 刘雨辰 郑钧元 QIN Kai;SUN Xin-hua;YANG Liang-jun;LIU Yu-chen;ZHENG Jun-yuan(Tianjin Jinniu Power Sources Material Co.,Ltd.,Tianjin 300400,China)

机构地区：[1]天津金牛电源材料有限责任公司,天津300400

出　　处：《电源技术》2020年第8期1099-1101,1181,共4页Chinese Journal of Power Sources

摘　　要：磷酸铁锂电池理论比容量较低,通过提高电极材料的压实密度、面密度等来提高其能量密度,对电解液的浸润性提出了更高要求。针对高比能磷酸铁锂电解液体系进行研究,包括溶剂体系、锂盐含量和浸润型添加剂,采用电导率/粘度对比、定量滴定和电池评价等方法。结果表明,采用溶剂体系比例为w(EC):w(EMC):w(DMC)=25:45:30,LiPF6含量为1 mol/L,浸润添加剂FB含量2%、FS001含量0.01%,成膜添加剂VC含量1%组成的电解液方案在高比能磷酸铁锂电池上表现出优异的浸润性能和电化学性能。The theoretical specific capacity of LiFePO4 battery is relatively low.The energy density can be increased by increasing the compaction density and surface density of the electrode materials,and the electrolyte wettability needs to be improved.The electrolyte system of high specific energy LFP was studied,including the solvent system,lithium salt content and wettability additives in the electrolyte composition.The experiment program included the electrical conductivity/viscosity contrast,quantitative titration and battery evaluation.The results show that when the solvent system proportion is w(EC):w(EMC):w(DMC)=25:45:30,the content of LiPF6 is 1 mol/L,the wettability additives include 2% FB and 0.01% FS001,and the content of film-forming additive VC is 1%,the high specific energy LFP battery has excellent wettability and electrochemical performance.

关 键 词：磷酸铁锂(LiFePO4) 浸润性 溶剂 LIPF6 氟苯(FB) 氟表面活性剂(FS001) 

分 类 号：TM912[电气工程—电力电子与电力传动]