▎ 摘　　要

NOVELTY - Preparation of low temperature rate power lithium ion battery involves adding composite anode material, binder and composite conductive slurry into vacuum high speed stirrer, spray-granulating and low temperature cracking; stirring nano lithium titanate (Li4Ti5O12), graphite secondary particles and binder, spray-granulating and low temperature cracking; adding composite anode material carbon fused secondary particle, conductive carbon black, binder and organic solvent to stirrer, coating on aluminum current collector and preparing into anode sheet; adding graphite secondary particle surface fused with nano lithium titanate, conductive agent, conductive graphite, binder, dispersant and water to stirrer, coating on copper current collector and preparing into cathode sheet; cutting to anode sheet and cathode sheet to size requirement, vacuum baking, welding, winding composite diaphragm paper, assembling and forming, and injecting low temperature electrolyte; and packaging battery. USE - The method is used for preparing low temperature rate power lithium ion battery. ADVANTAGE - The method enables preparation of low-temperature-rate power lithium-ion battery having excellent charging and discharging characteristics at low temperature of -40 degrees C to 10 C. DETAILED DESCRIPTION - Preparation of low temperature rate power lithium ion battery comprises: (A) adding composite anode material, binder and composite conductive slurry into vacuum high speed stirrer, spray-granulating and low temperature cracking under atmosphere furnace to obtain composite anode material carbon fused secondary particle; (B) adding nano lithium titanate (Li4Ti5O12), graphite secondary particles and binder into vacuum high speed stirrer, stirring, spray-granulating and low temperature cracking under atmosphere furnace to obtain graphite secondary particle surface fused with nano lithium titanate; (C) adding composite anode material carbon fused secondary particle, conductive carbon black, binder and organic solvent at mass ratio of 1: 0.01-0.03: 0.01-0.03: 0.3-0.5 to vacuum high speed stirrer, coating on aluminum current collector and preparing into anode sheet meeting process standard; (D) adding graphite secondary particle surface fused with nano lithium titanate, conductive agent, conductive graphite, binder, dispersant and water at mass ratio of 1: 0.005-0.03: 0.005-0.03: 0.01-0.03: 0.01-0.03: 0.8-1.4 to vacuum high speed stirrer, coating on copper current collector and preparing into cathode sheet meeting process standard; (E) preparing solvent, lithium salt and additive using 14-16 mass% lithium hexafluorophosphate, 2-4 mass% lithium bisfluorosulfonimide, 15-25 mass% ethylene carbonate, 10-15 mass% propylene carbonate, 15-30 mass% ethyl methyl carbonate, 25-40 mass% ethyl acetate, 2-3 mass% fluoroethylene carbonate and 2-3 mass% (trimethylsilane) phosphate; (F) cutting to anode sheet and cathode sheet to size requirement meeting process standard, vacuum baking, welding electrode tab to size position, winding composite diaphragm paper, assembling and forming, and injecting low temperature electrolyte; and (G) packaging battery according to specification requirement, specific activating and aging.