膜科学与技术

新型聚芳醚砜锂离子电池隔膜的制备及性能

作者：储健¹，²，王丽华²，虞鑫海¹

单位： 1.东华大学应用化学系，上海 201620；2. 中国科学院化学研究所，北京 100190

关键词：新型聚芳醚砜（BDD）；锂离子电池；隔膜；非溶剂致相分离法

出版年,卷(期):页码： 2021,41(6):75-84

摘要：

利用非溶剂致相分离法（NIPS）制备新型结构聚芳醚砜（BDD）锂离子电池隔膜，详细考察溶剂种类、聚合物浓度、凝固浴组成以及铸膜液在空气中的停留时间（T）等因素对隔膜微结构和性能的影响，得出最佳成膜条件：溶剂为磷酸三乙酯（TEP），聚合物浓度为20 wt%，凝固浴为水/异丙醇=4/6（质量比），停留时间为20 s。对最佳成膜条件下隔膜进行测试，发现与聚丙烯（PP）隔膜相比，BDD隔膜具有更高的孔隙率、吸液率以及离子电导率，分别达到了90.52%，377.76%和0.92 mS cm-1，且热稳定性能优异。该隔膜所组装的锂离子电池在0.2 C电流密度下达到了141.2 mAh g-1的放电比容量，高于PP的123.7 mAh g-1，表现出优异的倍率性能；同时在0.5 C电流密度下循环100圈后，容量保持率达到了92.3%，说明有优异的循环性能。

By using the non-solvent induced phase separation(NIPS) method to prepare a new-structure polyarylethersulfone (BDD) lithium ion battery separator, this paper has a detailed exploration of the factors such as the type of solvent, polymer concentration, coagulation bath composition and the residence time of the casting liquid in the air (T) on the microstructure and performance of the separator film, which helps to work out the best film forming conditions : the solvent should be TEP, the polymer concentration should be 20%, the coagulation bath should be water and isopropanol in the proportion of 4:6, and the residence time of the casting liquid in the air should be 20 seconds. The separator is tested under the optimal film-forming conditions, and it is found that, compared with the PP separator, the BDD separator has higher porosity, liquid-absorbing ratio and ionic conductivity reaching 90.52%, 377.76% and 0.92 mS cm-1 as well as excellent thermal stability. The lithium-ion battery assembled by the polyarylethersulfone separator has reached a discharge specific capacity of 141.2 mAh g-1 at a current density of 0.2C, which is higher than the 123.7 mAh g-1 of PP, showing excellent rate performance. Meanwhile, the capacity retention rate reaches 92.3% after 100 cycles under 0.5 C, showing excellent cycle performance.

储健（1997-），安徽安庆人，硕士研究生，主要从事锂离子电池隔膜的制备.

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