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VIPS法制备PBI/PEI高吸液率锂离子电池隔膜

作者：鲁成明，王丽华，储健，虞鑫海

单位： 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

关键词： VIPS法，聚苯并咪唑，聚醚酰亚胺，锂离子电池，隔膜

DOI号：

分类号： TM911

出版年,卷(期):页码： 2022,42(3):23-31

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-1，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；0.5C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 (Short Name: 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 most loose 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, up to 391.84%. 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-1, much higher than that of PP (Polypropylene) 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 5C current density, the capacity retention rate is 95.2%, which shows excellent cycle performance.

基金项目：

作者简介：

鲁成明（1996-），男，浙江绍兴人，硕士研究生，主要从事锂离子电池隔膜的制备

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