High-power lithium ion battery pole piece and preparation process thereof

Abstract

The invention relates to a high-power lithium ion battery pole piece and a preparation process thereof. The battery pole piece is provided with a current collector, wherein the positive and reverse sides of the current collector are coated with conductive base layers; the conductive base layers are coated with active substance coatings; each conductive base layer consists of a conductive agent and an adhesive according to a mass ratio of 75-95 percent to 7-25 percent. The preparation process comprises the following steps: mixing the adhesive with an organic solvent, thus obtaining an adhesive solution; stirring the conductive agent and the adhesive solution, thus obtaining slurry; grinding the slurry by using a colloid grinder, regulating the viscosity to be 300-1,000mpa.s, screening to obtain conductive slurry, coating the positive and reverse sides of the current collector with the conductive slurry, drying and compacting to obtain the conductive base layer; and coating the conductive base layer with the active substances, drying and compacting to obtain a high-power lithium ion power battery piece. The electric conductivity of the battery piece can be improved; for the battery piece under the same surface density condition, the rate discharge performance of the battery and a discharge platform are high, and over 94 percent of capacity can be preserved under the 40C-rate current discharge condition.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a high-power lithium-ion battery pole piece and a preparation process thereof. Background technique [0002] As the world is facing increasingly serious environmental and energy problems, seeking high-efficiency and renewable green energy is an inevitable trend in today's social development and scientific and technological progress. At present, the power battery has been one of the new green power sources that the world's developed countries focus on developing. [0003] Lithium-ion batteries have the advantages of no pollution, no memory effect, high specific energy, and light weight. They have been widely used in mobile communications and notebook computers since the early 1990s, and have developed rapidly. At present, lithium-ion batteries have also begun to be used as power sources for electric vehicles such as electric vehicles, electric mopeds...

AI Technical Summary

Problems solved by technology

However, with the continuous development of electric vehicles, it is difficult for lithium-ion batteries with 3-5C rate discharge to meet the requirements of existing electric vehicles. A high-power lithium-ion battery that can continuously output 5-40C current is needed to meet The power energy of the above-mentioned means of transportation

[0004] The invention patent with the publication number CN 102618097A discloses a conductive base coating for lithium ion batteries, lithium ion battery electrodes and lithium ion batteries. Black is used as a conductive agent. First, dry powder is crushed and classified, and then added to CMC glue for crushing, classification, and dispersion. Finally, SBR is added to stir to obtain a conductive base coating. The process is complicated, and several different equipment are required for processing.

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