10 μm-Thick High-Strength Solid Polymer Electrolytes with Excellent Interface Compatibility for Flexible All-Solid-State Lithium-Metal Batteries.

Abstract

An ultrathin solid polymer electrolyte (SPE) consisting of modified polyethylene (PE) as the host and poly(ethylene glycol) methyl ether acrylate and lithium salts as fillers is presented. The porous poly(methyl methacrylate)-polystyrene interface layers closely attached on both sides of the PE effectively improve the interface compatibility among electrolytes and electrodes. The resultant 10 μm-thick SPEs possess an ultrahigh ionic conductance of 34.84mS at room temperature and excellent mechanical properties of 103.0MPa with elongation up to 142.3%. The Li//Li symmetric cell employing an optimized solid electrolyte can stably cycle more than 1500h at 60°C. Moreover, the LiFePO4 //Li pouch cell can stably cycle over 1000 cycles at 1C rate and with a capacity retention of 76.4% from 148.9 to 113.7mAhg-1 at 60°C. The LiCoO2 //Li pouch cell can stably operate at 0.1 and 0.2C rate for each 100 cycles. Furthermore, the LiFePO4 //Li pouch cell can work stably after curling and folding, which proves its excellent flexibility and safety simultaneously. This work offers a promising strategy to realize ultrathinness, excellent compatibility, high strength, as well as safe solid electrolytes for all-solid-state lithium-metal batteries.