文献类型：期刊文献

英文题名：Advanced polyethylene separator coated with core-shell structured polydopamine-aluminum nitride composite for enhancing electrochemical performance of high-rate lithium-ion batteries

作者：Wang, Xiaoming[1,2];Zhu, Jin[2];Niu, Xuhong[3];Yang, Haotian[3];Liu, Qizhou[2];Lei, Wei[1];Xie, Jinku[2];Wu, Yongzhen[1,4];Zhu, Wei-Hong[1,4]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]JiangSu Adv Mat Tech Co LTD, Changzhou 320400, Peoples R China;[3]NingDe Adv Mat Tech Co LTD, Ningde 352100, Peoples R China;[4]East China Univ Sci & Technol, Ctr Photosensit Chem Engn, Shanghai 200237, Peoples R China

年份：2026

卷号：152

外文期刊名：JOURNAL OF ENERGY STORAGE

收录：;EI(收录号：20260419955276);WOS:【SCI-EXPANDED(收录号:WOS:001676289600001)】；

语种：英文

外文关键词：Lithium-ion batteries; Polyethylene separator; Functional coating; Aluminum nitride nanoparticles; Polydopamine

摘要：As a key component of lithium-ion batteries (LIBs), separators are crucial for rate performance and security. Nonetheless, commercial polyolefin separator has several shortcomings including poor electrolyte wettability, low porosity, and insufficient thermal stability, seriously limiting the electrochemical performance and security of LIBs. Herein, a polydopamine (PDA) layer was uniformly coated on the surface of aluminum nitride nanoparticles (AlN) via self-polymerization of dopamine (DA) under alkaline conditions and it-it stacking interaction. This modification was directly applied to the polyethylene (PE) separator as a functional coating to effectively address these challenges. Compared to commercial PE separator, PDA-AlN@PE composite separator exhibited a layered porous structure that significantly improved electrolyte wettability and thermal stability. The capacity retention rate of Li||LFP cell assembled with PDA-AlN@PE composite separator could reach 93% after 150 cycles at 0.5C. Furthermore, the capacity retention rate could still reach 71% after 100 cycles at a high rate of 3C. Additionally, PDA-AlN@PE composite separator did not experience significant thermal shrinkage at 180 degrees C, providing superior security than commercial PE separator. Meanwhile, PDA-AlN functional layer provided an enhanced level of thermal conductivity and mechanical strength for the composite separator, thereby enhancing the security of batteries. Our work presents a feasible thought for designing a high-security and heat-resistant separator for LIBs.