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Preparation and performance of composite separators containing amphiphilic polymer lithium salt for lithium batteries

Authors： XU Yanyan, ZHAO Zihao, WANG Liujian, ZHU Ziran, PAN Leyi, HUANG Zheng, ZHANG Yujie，ZHU Liheng, ZHU Baoku

Units： Engineering Research Center of Membrane and Water Treatment, MOE, International Research Central for Functional Polymers, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, China

KeyWords： amphiphilic polyester nanoparticles; polymeric lithium salt; separator; lithium battery; lithium dendrite

ClassificationCode：TQ028； TM912

year,volume(issue):pagination： 2026,46(1):1-10

Abstract：

Polyolefin separators are critical materials for lithium-ion batteries (LIBs). However, polyolefin separators exhibit intrinsic drawbacks such as poor electrolyte compatibility, low thermal stability and uneven pore structures. Surface-coating modifications of the separator are widely used to address these issues. In order to obtain efficient, environmentally friendly and low-cost polyolefin separator coating materials, this study prepared a novel lithium salt of amphiphilic polyester polymer nanoparticle (APNL) and applied it to the surface of polypropylene (PP) separators using an aqueous-based coating method. The composition and properties of modified separators (APNL@PP) were investigated. The APNL coating could improve the ionic conductivity of the separator, enhance the compatibility of the separator/electrode interfaces, effectively reduce the resistance during the transport of lithium ions, promote uniform deposition of lithium ions on the lithium electrode, and inhibit the growth of lithium dendrites. As a result, the LFP/Li battery assembled with the APNL@PP-1 separator maintained a capacity retention rate of 80.0% after 200 cycles at 1 C, while the NCM811/Li battery assembled with the APNL@PP-1 separator exhibited a higher capacity retention rate (94.76%) after 50 cycles at 1 C. Both the performances of these two battery samples demonstrating the better cycling stability of APNL@PP separators.

Funds：

浙江省自然科学基金项目（LD22E030006）

AuthorIntro：

徐艳艳（1999-），女，浙江丽水人，硕士研究生，主要从事锂金属电池用隔膜材料研究

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