文献类型：期刊文献

英文题名：A novel polymer-modified separator for high-performance lithium-ion batteries

作者：Xue, Caihong[1,3];Jin, Dandan[1];Nan, Hui[3];Wei, Haomin[3];Chen, Huiyuan[2];Zhang, Chao[2];Xu, Shiai[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]Sch Chem Engn, Xining 810016, Peoples R China;[3]Qinghai Univ, Sch Mech Engn, Qinghai Prov Key Lab New Light Alloys, Xining 810016, Peoples R China

年份：2020

卷号：449

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20195007828655);WOS:【SCI-EXPANDED(收录号:WOS:000510947000035)】；

基金：This research is financially supported by the National Natural Science Foundation of China (21764011), the Foundation from Qinghai Science and Technology Department (2020-HZ-808, 2017-ZJ-750 and 2017-ZJ-794). Thousand Talents Program of Qinghai Province, Kunlun Scholar Award Program of Qinghai Province and Shanghai Aerospace Science and Technology Innovation Foundation.

语种：英文

外文关键词：Lithium ion battery; Hyperbranched polybenzimidazole; Polyethylene separator; Surface modification

摘要：In this study, hyperbranched polybenzimidazole (HBPBI) was synthesized and coated on polyethylene membrane surface with terephthaldehyde (TPA) cross-linker to obtain high-performance CHBPBIE separator for application in lithium ion battery (LIB). The introduction of benzimidazole, amino and carboxyl groups to TPA cross-linked HBPBI (CHBPBI) could improve the wettability, electrolyte uptake, heat resistance and thermal stability of CHBPBIE separator. The absorption of the liquid electrolyte is increased from 90% for the control separator to 181% for CHBPBIE separator. More importantly, the cross-linked coating structure can greatly improve the ionic conductivity of CHBPBIE separator, and it is 0.77 mS cm(-1) at 25 degrees C, which is increased by 10.6 times compared with that of the control PE separator. The LIB half cells assembled with CHBPBI modified separator shows 73% increase in power capability at 7 C rate and a discharge capacity retention rate of 91.1% after 400 cycles at 2 C rate. Thus, the modified separator has the potential for use in high-performance LIB.