TY  - EJOU
AU  - Li, Haoran 
AU  - Xu, Yayou 
AU  - Zhang, Zihan 
AU  - Han, Feng 
AU  - Pan, Ye-Tang 
AU  - Yang, Rongjie 

TI  - Advancements and Challenges in Enhancing Thermal Stability of Lithium-Ion Battery Separators: Review on Coating Materials, High-Temperature Resistant Materials and Future Trends
T2  - Journal of Polymer Materials

PY  - 2025
VL  - 42
IS  - 1
SN  - 0976-3449

AB  - The thermal stability of lithium-ion battery separators is a critical determinant of battery safety and performance, especially in the context of rapidly expanding applications in electric vehicles and energy storage systems. While traditional polyolefin separators (PP/PE) dominate the market due to their cost-effectiveness and mechanical robustness, their inherent poor thermal stability poses significant safety risks under high-temperature conditions. This review provides a comprehensive analysis of recent advancements in enhancing separator thermal stability through coating materials (metal, ceramic, inorganic) and novel high-temperature-resistant polymers (e.g., PVDF copolymers, PI, PAN). Notably, we critically evaluate the trade-offs between thermal resilience and electrochemical performance, such as the unintended increase in electronic conductivity from metal coatings (e.g., Cu, MOFs) and reduced electrolyte wettability in ceramic coatings (e.g., Al<sub>2</sub>O<sub>3</sub>). Innovations in hybrid coatings (e.g., BN/PAN composites, gradient-structured MOFs) and scalable manufacturing techniques (e.g., roll-to-roll electrospinning) are highlighted as promising strategies to balance these competing demands. Furthermore, a comparative analysis of next-generation high-temperature-resistant separators underscores their ionic conductivity, mechanical strength, and scalability, offering actionable insights for material selection. The review concludes with forward-looking perspectives on integrating machine learning for material discovery, optimizing interfacial adhesion in ceramic coatings, and advancing semi-/all-solid-state batteries to address both thermal and electrochemical challenges. This work aims to bridge the gap between laboratory innovations and industrial applications, fostering safer and more efficient lithium battery technologies.
KW  - Lithium battery; thermal stability; separator; coating

DO  - 10.32604/jpm.2025.062352