Preparation method of lithium ion battery positive pole size

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 is a method for preparing lithium ion battery positive electrode slurry. Background technique [0002] Lithium-ion batteries have high energy density, long cycle life, good rate performance and safety performance, and are green and environmentally friendly. They are currently the main energy products. In particular, lithium iron phosphate cathode material lithium-ion batteries have better cycle life, rate performance and safety performance. Based on their unique advantages, they are widely used in power fields such as electric buses. [0003] As an important part of the lithium ion battery, the positive electrode of the lithium ion battery has a great influence on the performance of the lithium ion battery. The preparation of the positive electrode slurry of the lithium ion battery directly affects the comprehensive performance of the lithium ion battery. At present, most lithium ion batte...

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

Images