| abstract |
An all-solid polymer electrolyte, in particular, a polyoxymethylene all-solid polymer electrolyte prepared by in-situ ring-opening polymerization, and use thereof in forming an all-solid secondary lithium battery. Said all-solid polymer electrolyte is formed by initiating in-situ ring-opening polymerization of a tripolyoxymethylene-based monomer, an additive, and a lithium salt by a catalyst on a porous supporting material, has a thickness of 10 μm-800 μm, ionic conductivity at room temperature of 4 × 10 -5 S/cm to 8 × 10 -3 S/cm, and an electrochemical window of not less than 4.2 V. The all-solid polymer electrolyte is easy to prepare and form, and has good mechanical properties and high ionic conductivity at room temperature; moreover, the all-solid polymer electrolyte can effectively inhibit the growth of lithium dendrites and match a high voltage positive electrode material, effectively improving the interface stability, long cycle performance, and energy density. |