苏州大学材料与化学化工学部 江苏省先进功能高分子材料设计及应用重点实验室苏州市大分子设计与精密合成重点实验室 苏州
隔膜是锂离子电池的重要组成部分,制备高性能的隔膜是提升电池性能的一个重要途径。本文通过化学交联方法制备了可用于锂离子电池的纤维素隔膜,即醋酸纤维素(CA)和交联剂六亚甲基二异氰酸酯(HDI)经缩合反应形成交联结构的纤维素基膜。实验结果表明：与商用聚乙烯隔膜相比,该膜拥有优异的热稳定性、机械强度和电化学性能,在200 °C下加热30 min几乎不发生热收缩,拉伸强度可达30.70 MPa,其组装的锂离子电池也拥有良好的循环充放电性能,在0.5 C/0.5 C的充放电条件下循环100 圈后电池放电比容量可保持95 %。
The separator is an important part of lithium-ion batteries, and obtaining high-performance separators is a significant way to improve the battery performance. In this paper, the cellulose separator which can be used in lithium-ion batteries was prepared by chemical cross-linking. That is, a cellulose-based cross-linked structure membrane was synthesized withcellulose acetate (CA) and cross-linking agent hexamethylene diisocyanate (HDI) by a condensation reaction. The experimental results showed that: compared with the commercial polyethylene separator, this membrane had excellent thermal stability, mechanical strength and electrochemical performance, which hardly shrinked at 200 ?C for 30 minutes. The tensile strength could reach 30.70 MPa , The assembled lithium-ion battery also had good cycle charge and discharge performance, and the specific discharge capacity of the battery maintained at 95% after 100 cycles under the charge and discharge conditions of 0.5 C/0.5 C.