PEO/hollow mesoporous polymer spheres composites as electrolyte for all solid state lithium ion battery

Abstract Practical, high-yield mesoporous organic polymer (MOP) spheres were successfully synthesized by a novel self-template method, which can be used as fillers to prepare poly (ethylene oxide) (PEO)-based polymer electrolytes membranes. The result shows that both the electrical conductivity and lithium-ion conductivity of PEO-based electrolytes can be improved effectively by adding the MOP filler. The electrolyte membranes are mechanically robust, thermally stable to over 270 °C, and can effectively block dendrites penetrating from metallic-lithium anode to cathode. The Li + transfer conductivity of composite electrolyte membrane increases to 4.4 × 10 −4  S cm −1 at 63 °C. All-solid-state LiFePO 4 /MOP-PEO-LiTFSI/Li cell shows excellent cycling (144 mAh g −1 after 300 cycles) and rate (167 mAh g −1 at 0.2 C, 170 mAh g −1 at 0.5 C, 160 mAh g −1 at 1 C and 145 mAh g −1 at 2 C) performance.