Preparation method of conductive agent material capable of improving comprehensive performance of battery

Abstract

The invention discloses a conductive agent material capable of improving the comprehensive performance of a battery. The conductive agent material contains 100 parts of lithium cobalt oxide, 100 partsof nickel cobalt lithium manganate, 100 parts of lithium manganate, 50 parts of carbon nanotubes, 50 parts of a conductive agent and 2 parts of polyvinylidene fluoride. The invention belongs to the technical field of lithium battery material development and application, and particularly relates to a preparation method of a conductive agent material capable of improving the comprehensive performance of a battery, which reduces the comprehensive internal resistance value of the battery, increases the battery capacity value under the same volume according to the proportion of an extreme-lift active substance and prolongs the cycle service life of the battery.

Description

technical field [0001] The invention belongs to the technical field of development and application of lithium battery materials, and specifically refers to a preparation method of a conductive agent material that can improve the comprehensive performance of batteries. Background technique [0002] The existing SP prepared according to the traditional scheme has a particle size range of about 40nm, a specific surface area of ​​about 65m2 / g3, a DBP oil absorption value of 110-160ml / 100g, and a recovery of about 0.5Wt%. The SP conductive agent prepared by high-temperature pyrolysis using a new process The recovery value of the material is within 0.1Wt%, and the content of metal and other impurities is much lower than that of the conventional process, which improves the comprehensive performance of the material, and its oil absorption value can reach 210ml / 100g, above. The original positive electrode ingredient process is conductive liquid, linear conduction or chain or The comp...

AI Technical Summary

Problems solved by technology

[0002] The existing SP prepared according to the traditional scheme has a particle size range of about 40nm, a specific surface area of ​​about 65m2 / g3, a DBP oil absorption value of 110-160ml / 100g, and a recovery of about 0.5Wt%. The SP conductive agent prepared by high-temperature pyrolysis using a new process The recovery value of the material is within 0.1Wt%, and the content of metal and other impurities is much lower than that of the conventional process, which improves the comprehensive performance of the material, and its oil absorption value can reach 210ml / 100g, above. The original positive electrode ingredient process is conductive liquid, linear conduction or chain or The comprehensive ratio of the grape-shaped conductive agent used alone is in the range of 1.5% to 3.5%. Now the new preparation method of CNT+SP can be used to reduce the comprehensive addition ratio to the range of 0.6 to 1.5%. 0.9-2.0% ratio, the battery capacity has been further increased, the battery capacity has been reduced by about 30% and the cycle performance has increased by about 10%. Currently, conductive materials have a large internal resistance problem caused by insufficient conductivity, and the battery capacity cannot be broken. Existing value, existing system materials are difficult to improve battery cycle performance