A kind of preparation method of positive electrode slurry of lithium ion battery

Abstract

The invention discloses preparation method of lithium ion battery positive pole size. The preparation method comprises the following steps: firstly mixing polyvinylidene fluoride and N-methyl pyrrolidone to prepare glue solution; mixing a relatively thick mixture of N-methyl pyrrolidone, a carbon nano tube, graphene and conductive carbon black at a high speed and dispersing to obtain conductive agent size; adding lithium iron phosphate and a certain amount of N-methyl pyrrolidone for twice to obtain a relatively thick mixture to mix at a high speed; and adding the N-methyl pyrrolidone to mix at a high speed, adding the glue solution to mix; and finally adjusting the viscosity and screening to obtain the lithium ion battery positive pole size which is good in performance.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a method for preparing positive electrode slurry of lithium ion batteries. Background technique [0002] Lithium-ion batteries have high energy density, long cycle life, good rate performance and safety performance, and are environmentally friendly. They are currently the main energy products. Especially the lithium iron phosphate cathode material lithium-ion battery has better cycle life, rate performance and safety performance. Based on its unique advantages, it is widely used in power fields such as electric buses. [0003] As an important part of lithium-ion batteries, the positive electrode of lithium-ion batteries has a great impact on the performance of lithium-ion batteries. The preparation of lithium-ion battery cathode slurry directly affects the overall performance of lithium-ion batteries. At present, most lithium-ion battery manufacturers have disadvantages ...

AI Technical Summary

Problems solved by technology

At present, most lithium-ion battery manufacturers have disadvantages such as uneven dispersion of lithium iron phosphate lithium-ion battery cathode slurry and poor processing performance of the pole piece. People usually use extended stirring time, accelerated stirring speed, powder distribution and addition, dry powder stirring, etc. Ways to improve the dispersion effect and processing performance of the material, but the effect is not obvious, and even some high-speed and long-time stirring cause the colloid to deteriorate at high temperature instantly, reduce the viscosity of the colloid, and affect the processing performance of the battery

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