Patent ID: 6994737

Claim:
A process for preparing polymeric Li-ion cell with high-capacity, comprising the steps of: (1) preparing the anode comprising the steps of: (a) preparing an anode paste using acetone as a solvent, said paste comprising a mixture of materials in the following weight ratios: Mixture adulterated with lithium salt and cobalt oxide: 60%+14 70% Polyvinylidene fluoride (PVDF): +11 5%+14 10% Conductive carbon black: +11 8%+14 15% O-dibutyl phthalate ester: 12%+14 20% (b) mixing ethylene-acrylate copolymer (EAA), conductive carbon black, and acetone to form a aluminum current collector preprocessing paste; (c) coating said current collector preprocessing paste onto the aluminum current collector evenly to pre-process the aluminum current collector; (d) coating said aluminum current collector with said anode paste to generate a coated anode; (e) pressing said coated anode into a finished anode on a flat-press machine under certain temperature and pressure; (2) preparing the cathode comprising the steps of: (a) preparing an cathode paste using acetone as a solvent, said paste comprising a mixture of materials in the following weight ratios: Lithium-embedded carbon materials: 60%+14 70% Polyvinylidene fluoride (PVDF): +11 6%+14 15% Conductive carbon black: +11 9%+14 15% O-dibutyl phthalate ester: 18%+14 25% (b) mixing EAA, conductive carbon black, and acetone to form a copper current collector preprocessing paste; (c) coating a copper current collector evenly with said copper current collector preprocessing paste to form a treated copper current collector; (d) coating evenly said treated copper current collector with said cathode paste to form a coated cathode; (e) pressing said coated cathode into a finished cathode on a flat-press machine under certain temperature and pressure; (3) preparing a diaphragm comprising the steps of: (a) mixing with acetone the following materials according to the following weight ratios to form a paste Polyvinylidene fluoride (PVDF): 40%+14 65% Silicon dioxide with gas phase: +11 4%+14 10% O-dibutyl phthalate ester: 25%+14 45% (b) spraying said paste onto a polyester film to form said diaphragm: (4) preparing a single cell comprising the steps of: (a) laminating said anode, diaphragm, and cathode; (b) heat pressing said laminated anode, diaphragm, and cathode on a flat-press machine to produce said single cell; (5) removing of plasticizer comprising the step of: (a) extracted said single cell with absolute methanol for 3 times; (b) drying said single cell; (6) welding a current collector comprising the steps of: (a) welding said copper current collector and the aluminum current collector with nickel lugs together with an ultrasonic welding machine to form two electrodes of the cell; (7) immersing said single cell in an electrolyte solution; (8) packing said single cell with aluminum-plastic composite film and then formation is carried out for it.