VIPS法制备PBI/PEI高吸液率锂离子电池隔膜  

Preparation of high electrolyte uptake PBI/PEI lithium ion battery separator by vapor induced phase separation method

作　　者：鲁成明 王丽华[1] 储健 虞鑫海[2] LU Chengming;WANG Lihua;CHU Jian;YU Xinhai(Key laboratory of Green Printing,Institute of Chemistry Chinese Academy of Sciences,Beijing 100190,China;Department of Applied Chemistry,Donghua University,Shanghai 201620,China)

机构地区：[1]中国科学院化学研究所,绿色印刷院重点实验室,北京100190 [2]东华大学应用化学系,上海201620

出　　处：《膜科学与技术》2022年第3期23-31,共9页Membrane Science and Technology

摘　　要：以聚苯并咪唑(PBI)和聚醚酰亚胺(PEI)为原料,通过蒸汽诱导相分离(VIPS)法制备高吸液率PBI/PEI(简称PBEI)锂离子电池隔膜.PBEI隔膜内部孔结构为三维网状结构,当PBI的含量达到40%时(PBEI-4),隔膜内部的孔结构最为疏松,孔隙率最大,并且由于醚键、酰胺键和咪唑极性基团的存在使PBEI隔膜的吸液率更高.PBEI-4隔膜具有优良的热稳定性,在160℃下基本不收缩.PBEI-4隔膜的离子电导率为1.943 mS/cm,远高于商业聚丙烯(PP)膜和PEI隔膜.相同电流密度下,PBEI-4隔膜的放电容量高于PP及PEI隔膜;0.5 C电流密度循环50次后,容量保持率为95.2%,表现出优异的循环稳定性.A kind of high electrolyte uptake PBI/PEI(PBEI) lithium ion battery separator was prepared by blending with polybenzimidazole(PBI) and polyetherimide(PEI) via vapor induced phase separation(VIPS) method. The internal microstructure of PBEI membrane presents a three-dimensional network structure. When the content rate of PBI reaches 40%(PBEI-4), the pore structure is the loosest and the porosity is the highest. Besides, due to the existence of ether bond, amide bond and imidazole polar groups, the electrolyte uptake of PBEI-4 separator is the highest. PBEI-4 membrane has good thermal stability and almost does not shrink at 160 ℃.The ionic conductivity of PBEI-4 membrane is 1.943 mS/cm, much higher than that of PP membrane and PEI membrane. Under the same current density, the discharge capacity of PBEI-4 membrane is also higher than that of PP and PEI membrane. After 50 cycles of 0.5 C current density, the capacity retention rate is 95.2%, which shows excellent cycle performance.

关 键 词：VIPS法 聚苯并咪唑 聚醚酰亚胺 锂离子电池 隔膜 

分 类 号：TQ028[化学工程] TM911[电气工程—电力电子与电力传动]