Facile Chemistry Towards All Solid State Polymer Electrolytes and Lithium Ion Batteries

Abstract: All solid state lithium batteries have been attracted intensive attention due to higher energy density and higher safety characteristics. Compared with inorganic solid state batteries, all solid polymer electrolyte lithium batteries possess advantages of readily processability and lower electrolyte/electrode interfacial impedance. These unique characteristics endow it a very promising power sources for large format application. However, the conventional fabrication for the solid polymer lithium battery involved a prefab solid polymer membrane laminated by the cathodes and anodes sheets. Herein an in situ polymerization process is developed to prepare all solid polymer electrolyte during the battery assembly. Some liquid precursors, such as epoxy compounds, are injected into battery and then catalyzed by LiFP6salt into all solid polymer electrolyte. In situ polymerization results in even lower electrolyte/electrode interfacial resistance, greatly improving the battery rate capability and cycling performance. These facile chemistry demonstrates a manufacturing innovation for all-solid-state polymer electrolyte batteries with cost-effectiveness and high performance.   Keywords: solid polymer electrolyte, in situ polymerization, solid lithium battery;