混合锂盐LiTFSI-LiODFB基电解液的高温性能  

High temperature performance of electrolyte with mixed lithium salts of LiTFSI and LiODFB

作　　者：王青磊 李法强[1] 贾国凤[1] 上官雪慧 

机构地区：[1]中国科学院青海盐湖研究所,青海西宁810008 [2]中国科学院大学,北京100049

出　　处：《电池》2016年第4期177-180,共4页Battery Bimonthly

基　　金：国家自然科学基金(U1507106;U1507114);青海省自然科学基金(2015-ZJ-935Q);青海省重点研发与转化计划(2016-GX-101)

摘　　要：研究双（三氟甲基磺酰）亚胺锂（LiTFSI）和二氟草酸硼酸锂（LiODFB）混合锂盐电解液用于磷酸铁锂（LiFePO_4）锂离子电池时的高温60℃性能,用SEM和X射线光电子能谱（XPS）研究高温60℃下LiTFSI基电解液对铝箔的腐蚀及LiODFB的防腐蚀机理。在高温60℃下,LiODFB的加入能减少LiTFSI基电解液对铝箔的腐蚀;当LiTFSI与LiODFB物质的量比为4∶6时,混盐基电解液电池以1 C在2.5~4.2 V充放电,第80次循环的放电容量保持率为99.7%,优于商业化六氟磷酸锂（LiPF_6）基电解液电池的58.6%。The high temperature 60℃ performance of electrolyte based on mixed salts of lithium bis （trifiuoromethane sulfonylimide） （LITFSI） and lithium difluoro（oxalato） borate （LiODFB） for lithium iron phosphate （ LiFePO4 ） L-ion battery was studied. The corrosion to AI current collector caused by LiTFSI based electrolytes at high temperature 60℃ and the anticorrosion mechanism of LiODFB were studied by using SEM and X-ray photoelectron spectroscopy（XPS）. The AI foil corrosion from LiTFSI- based electrolytes at high temperature 60℃ was reduced by adding LiODFB. When the mixed salts LiTFSI-LiODFB based electrolyte with 4：6 molar ratio were used for battery, the discharge capacity retention was 99.7% at the 80th cycle under 1 C charge-discharge in 2. 5- 4. 2 V. As a comparison, when the commercial lithium hexafluoropbosphate（ LiPF6 ） based electrolyte was used,it＇ s discharge capacity retention ratio was 58.6% under the same condition.

关 键 词：双(三氟甲基磺酰)亚胺锂 二氟草酸硼酸锂 电解液 高温 

分 类 号：TM912[电气工程—电力电子与电力传动]