Progress of Polymer Electrolytes Worked in Solid‐State Lithium Batteries for Wide‐Temperature Application

Solid‐state Li‐ion batteries have emerged as the most promising next‐generation energy storage systems, offering theoretical advantages such as superior safety and higher energy density. However, polymer‐based solid‐state Li‐ion batteries face challenges across wide temperature ranges. The primary issue lies in the fact that most polymer electrolytes exhibit relatively low ionic conductivity at or below room temperature. This sensitivity to temperature variations poses challenges in operating solid‐state lithium batteries at sub‐zero temperatures. Moreover, elevated working temperatures lead to polymer shrinkage and deformation, ultimately resulting in battery failure. To address this challenge of polymer‐based solid‐state batteries, this review presents an overview of various promising polymer electrolyte systems. The review provides insights into the temperature‐dependent physical and electrochemical properties of polymers, aiming to expand the temperature range of operation. The review also further summarizes modification strategies for polymer electrolytes suited to diverse temperatures. The final section summarizes the performance of various polymer‐based solid‐state batteries at different temperatures. Valuable insights and potential future research directions for designing wide‐temperature polymer electrolytes are presented based on the differences in battery performance. This information is intended to inspire practical applications of wide‐temperature polymer‐based solid‐state batteries. The diversification of electronic device applications imposes elevated requirements on the broad temperature adaptability and safety of polymer‐based solid‐state batteries. Modification strategies, including filler design, structural modification, optimization of Li salts, and interface design, can effectively address the limitations of polymer electrolytes, paving the way for versatile electrolyte applications across a wide temperature range.