▎ 摘　　要

NOVELTY - High rate and high specific energy lithium ion battery comprises a positive electrode sheet, negative electrode sheet, separator, and electrolyte, steel shell, and the cap, where the positive electrode sheet comprises 86-97.5 wt.% nickel cobalt lithium aluminate or nickel cobalt manganese lithium, 0-10 wt.% lithium manganate, 0.5-1 wt.% graphene, 1-1.5 wt.% ketjen black, 1-1.5 wt.% polyvinylidene fluoride, and the negative electrode sheet comprises 95.3-97 wt.% graphite silicon carbon, 1-2 wt.% conductive carbon black, 1-1.2 wt.% sodium carboxymethyl cellulose and 1-1.5 wt.% styrene-butadiene rubber. USE - High rate and high specific energy lithium ion battery used in electric tool, grass cutter and other large power electric appliance. ADVANTAGE - The high rate and high specific energy lithium ion battery has high rate high specific energy lithium ion battery, good stability, high cycle performance and high power density. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a high rate and high specific energy lithium ion battery, which involves: (A) mixing nickel cobalt lithium aluminate or nickel cobalt manganese oxide, lithium manganate, graphene, Ketjen black, and polyvinylidene fluoride into a double-star beater to make a slurry for 2 hours; (B) adding the prepared primary slurry to the high-speed disperser to make the viscosity reach 8000 divide by 1000 megaPascal to obtain the secondary slurry; (C) coating obtained secondary slurry on 14-16 micrometer thick aluminum foil with a surface density of 120-160g by spraying equipment, and drying to make a semi-finished positive electrode sheet with a moisture content of 0.15%; (D) rooling semi-finished positive electrode sheet into a compact electrode sheet according to the compaction density of the active material 3.3-3.6 g/mm3, cutting into a compact electrode sheet with a fully automatic cutting device 57-58 millimeter wide small piece to obtain the positive electrode; (E) mixing graphite silicon carbon, conductive carbon black, sodium carboxymethyl cellulose, and styrene-butadiene rubber into a double star machine to make a 2 hour primary slurry; (F) adding prepared primary slurry to the high-speed disperser to make the viscosity reach 6000 divide by 1000 megaPascal to obtain the secondary slurry; (G) using spraying equipment to coat the obtained secondary slurry on 9-10 m thick copper foil with an areal density of 70-85 g, and drying to produce semi-finished pole pieces with a moisture content of 0.15%; (H) rolling the semi-finished positive electrode sheet according to the compaction density of the active material of 1.4-1.6 g/mm3 to make compact electrode sheets, and then cutting into 58.5-59.5 millimeter wide pieces with automatic slitting equipment to obtain the negative electrode sheets; (I) welding the positive electrode sheet made with a 0.1 millimeter thick 4mm wide aluminum tape, welding negative sheet made weld a 0.08mm thick 4mm wide nickel tape when the positive sheet with 0.1mm thick 4mm wide aluminum; (J) welding welded positive electrode sheet and the negative electrode sheet with a ceramic separator and wound on a fully automatic winding machine and installing negative sheet made on the automatic winding machine as required, and the diameter is 17.5 divide by 0.25 millimeter core with a height of 61 divide by 1 millimeter; (K) installing the finished roll core into the jig, placing in a vacuum oven, vacuumizing, filling with nitrogen, and baking at a temperature of 85 divide by 10 degrees C and a pressure of -40-90 megaPascal, three-step cycle baking for 16 hours, reducing the moisture content in the core by 200 parts per million to obtain semi-finished batteries; (L) using automatic upper and lower gaskets into the shell, welding the negative lug and the steel shell, inserting the PIN, placing on the gasket, rolling the groove, testing for short circuit, and injecting 5.6 divide by 0.2g of electrolyte; (M) aging battery cell made for 36 hours in an environment with a temperature of 35-45 degrees C, placing on the forming cabinet for forming, using 0.2C After charging for 10 hours, aging cells for five days in an environment with a temperature of 40 divide by 5 degrees C, screening cells for internal voltage resistance, and the single charging voltage of qualified cells is controlled at 3.6-3.9 V; and (N) aging for five days in an environment with a temperature of 40 divide by 5 degrees C, wrapping the PET during the aging process, and then screening the cells into different voltage internal resistance grades through a matching machine, dividing the qualified cells, and finally set the capacity 2500 milliAmphere batteries, assembling batteries that have passed the FQC appearance inspection according to the capacity of 40 milliAmphere, voltage of 3 mV, and internal resistance of 2 mO and passing the inspection to obtain product.