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

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 degrees 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 x 10(-4 )S cm(-l) at 63 degrees C. All-solid-state LiFePO4/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.