Patent ID: 8343655

Claim:
A method of preparing a gel polymer Li-ion battery electrode slice, characterized in that the electrode slice comprises a two-layer composite structure of electrode active material/gel electrolyte or a three-layer composite structure of electrode active material/gel electrolyte/electrode active material, and the method includes the following steps: a) grinding an electrode active material, and adding an adhesive, a surfactant, a dispersant, an electrical conductive agent and a solvent for Li-ion battery electrode material thereto to obtain a raw slurry of the electrode active material; b) filtering the raw slurry of the electrode active material to obtain a uniform, fine precoating slurry; c) dispersing a monomer, a curing agent and an electrolyte of a gel polymer electrolyte into a solvent, and filtering the resultant dispersion to obtain a precoating gel electrolyte slurry; d) coating directly the precoating slurries obtained in steps b) and c) on a composite film of current collector and polyester by a multi-layer one-step coating process to obtain a battery electrode coating of a two-layer composite structure of electrode active material/gel electrolyte or of a three-layer composite structure of electrode active material/gel electrolyte/electrode active material; e) as to the battery electrode coating obtained in step d), using an oven or a horizontal channel drier to cure the polymeric monomer and dry the whole battery electrode coating, the drying temperature being 20-100° C., and the drying time being 10 seconds to 100 minutes.