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合成含三氟甲基和苯并咪唑结构的聚酰亚胺(PI)作为涂层，对商业化聚烯烃(PE)隔膜进行表面涂覆，探究不同固含量的涂覆液对涂层孔隙结构、物理性能及电化学性能的影响。结果显示：当PI溶液的质量分数为11.1%时，综合性能最优，相较于PE隔膜，复合隔膜具有较佳的热稳定性，150℃的收缩率仅为13%左右，800℃后的残炭率为27.2%,远高于PE隔膜；复合隔膜的离子电导率与离子迁移数分别达0.18 mS/cm和0.77;利用复合隔膜组装的电池具有与PE隔膜相当的倍率性能，且在1 C倍率下、循环300圈后的容量保持率为86.0%,在锂对称循环测试中，电池在工作1 000 h后，表现出更加稳定的脱(嵌)锂工作，能够形成稳定的固体电解质界面(solid electrolyte interface, SEI)层，并诱导锂的均匀沉积，从而提高电池的安全性和使用寿命。
Abstract：Polyimide(PI) containing trifluoromethyl and benzimidazole structures were synthesized as the raw materials of the coating and the commercial polyethylene(PE) separators was modified with the obtained PI solution. The effects of different solid contents of PI solutions on the pore structure of the coating and the physical and electrochemical properties of the composite separators were investigated. The results show that the composite separator obtained by PI solution of 11.1% displays optimal comprehensive performance. Compared with PE separator, the composite separator can inhibit thermal shrinkage at high temperature with the shrinkage rate of about 13% at 150 ℃ and the carbon residue rate of 27.2% after 800 ℃, which are much higher than those of PE separator. The ionic conductivity and ion mobility number of the composite separator are 0.18 mS/cm and 0.77, respectively. The cell assembled using composite separator has a rate performance comparable to that with PE separator and its capacity retention rate is 86.0% after 300 cycles at a 1 C rate. In lithium symmetric cycle testing, the battery exhibits more stable lithium insertion/delithiation after 1 000 h of operation, forming a stable(solid electrolyte interface, SEI) layer and inducing uniform deposition of lithium dendrites, thereby improving the safety and service life of the battery.
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基本信息:
DOI：10.19886/j.cnki.dhdz.2024.0063
中图分类号:TM912
引用信息:
[1]徐明礼,李琇廷,董杰等.基于聚酰亚胺改性聚烯烃复合隔膜的制备及其性能[J].东华大学学报(自然科学版),2025,51(01):22-30.DOI:10.19886/j.cnki.dhdz.2024.0063.
基金信息:
上海市自然科学基金(22ZR1403200)