Interface Engineered Electrolyte Design Strategy for Ultralong‐Cycle Solid‐State Lithium Batteries Over Wide Temperature Range

transport, promotes the in-situ formation of the LiF-rich inorganic-organic hybrid SEI, and enhances the overall stability of the battery. Consequently, FPCE assists in preserving stable LFP|FPCE|Li cells cycling, with 5000 cycles at a high current density of 10 C and an average capacity decay rate of merely 0.00448% per cycle. Furthermore, the Ah-level pouch cells demonstrate the capacity to operate stably within the temperature range of -10 to 80 °C. This study provides a valuable strategy for the design of wide-temperature solid-state polymer electrolytes.