| 摘要 |
PURPOSE: Provided is a polymer electrolyte for a lithium secondary battery, which has high ionic conductivity and low reactivity with lithium metal and is excellent in liquid component capacity, mechanical strength, and elasticity. CONSTITUTION: The polymer electrolyte comprise: 3-40wt.% of net-type polymers synthesized by UV-polymerization of polar monomers having at least two unsaturated groups or oligomers(crosslinking agent); 10-50wt.% of polymethyl methacrylate having an interpenetration structure with the net-type polymers and a number average molecular weight of 10,000-500,000, wherein the total amount of the net-type polymers and the polymethyl methacrylate is less than 60% based on the total amount of the electrolyte; 1-40wt.% of lithium salts; 30-85wt.% of the liquid component. And the polymer electrolyte is produced by a process comprising the steps of: preparing a polymer mixture solution by adding comonomers to the polymethyl methacrylate; adding the crosslinking agent and 0.1-2wt.%(based on the total electrolyte) of a photo-initiator to a mixture solution of the lithium salts and the liquid component and mixing the resultant with the polymer mixture solution and stirring; spreading the mixture solution on a smooth flat plane to make a film with a thickness of 0.01-1mm; irradiating the film with UV. |
