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Mixing preparation method of pulp of lithium ion battery

A lithium-ion battery and slurry technology, applied in electrode manufacturing and other directions, can solve the problems of large gap between the front and back of the coating, poor battery consistency, and difficulty in stirring evenly, and achieve the improvement of consistency, production efficiency, and uniformity. Effect

Inactive Publication Date: 2010-04-14
BAODING FENGFAN NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method takes a long time, and because the slurry is always stirred in a state of good fluidity, it is difficult to stir evenly, and the slurry is easy to settle, and the thickness is uneven when the slurry is applied to the current collector, and the gap between the front and the back of the coating is large. , battery consistency is not good

Method used

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  • Mixing preparation method of pulp of lithium ion battery
  • Mixing preparation method of pulp of lithium ion battery
  • Mixing preparation method of pulp of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: a. Weigh the raw materials according to the positive electrode battery slurry proportioning, and its mass ratio is positive electrode active material: binder: KS6: Carbon ECP=96: 2: 1: 1, wherein the solvent is N-methylpyrrolidone , NMP accounts for 40% of the mass percentage of the positive electrode active material, the binding agent is polyvinylidene fluoride PVDF, the conductive agent is KS6 type conductive graphite and Carbon ECP conductive carbon black, and the active material is lithium cobaltate; b. take the raw material Mix the solvent and binder in the raw material, stir fully, take the conductive agent in the raw material, active material mix and fully stir; c. take the mixture of 50% binder and solvent in step b and all the conductive agent, active material The mixture is mixed and fully stirred evenly; d. The remaining amount of binder and solvent mixture is added to the mixture in step c and stirred evenly. At this time, the viscosity of the o...

Embodiment 2

[0035] Embodiment 2: a. Weigh the raw materials according to the positive electrode battery slurry ratio, and its mass ratio is positive electrode active material: binder: KS6: Carbon ECP=85: 6: 4: 5, wherein the solvent is N-methylpyrrolidone , NMP accounts for 50% by mass of the positive electrode active material, the binder is polyvinylidene fluoride PVDF, the conductive agent is KS6 type conductive graphite and Carbon ECP conductive carbon black, and the active material is the ternary material nickel cobalt lithium manganese oxide; b. get the solvent in the raw material and the binder to mix, fully stir evenly, get the conductive agent in the raw material, the active material mix and fully stir; c. get the mixture of 60% of the binder and the solvent in step b and all Mix the conductive agent and the active material mixture, and stir well; d. Add the remaining binder and solvent mixture to the mixture in step c and stir evenly. At this time, the viscosity of the slurry obta...

Embodiment 3

[0036] Embodiment 3: a. Weigh the raw materials according to the positive electrode battery slurry ratio, and its mass ratio is positive electrode active material: binder: KS6: Carbon ECP=92: 5.5: 1.25: 1.25, wherein the solvent is N-methylpyrrolidone , NMP accounts for 48% of the mass percentage of the positive electrode active material, the binding agent is polyvinylidene fluoride PVDF, the conductive agent is KS6 type conductive graphite and Carbon ECP conductive carbon black, and the active material is lithium iron phosphate; Mix the solvent and binder in the raw material, stir well, take the conductive agent in the raw material, active material mix and fully stir; c. take the mixture of 40% binder and solvent in step b and all the conductive agent, active material The mixture is mixed and fully stirred evenly; d. The remaining amount of binder and solvent mixture is added to the mixture in step c and stirred evenly. At this time, the viscosity of the obtained slurry is 520...

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Abstract

The invention discloses a mixing preparation method of pulp of a lithium ion battery, which is used for solving the problems of long time consumption of mixing and not easy uniform dispersion of the pulp. In the technical scheme, the method comprises the following steps: for anodal pulp, firstly stirring a conductive agent, active substances, part of binders and solvents, and then adding the balance of raw materials to stir; and for cathodal pulp, firstly stirring a conductive agent, active substances, part of thickening agents and solvents, and then adding the balance of thickness agents and solvents to stir, and finally adding binders to stir. The method is simple to operate without replacing equipment, improves the uniform coating in the next process, is beneficial to improving the stability and the consistence of the battery and ensures that the production efficiency is nearly two times and the pulp is uniformly dispersed and not easy to deposit.

Description

technical field [0001] The invention relates to a storage battery slurry preparation method, in particular to a lithium ion battery slurry mixing preparation method, and belongs to the technical field of storage batteries. Background technique [0002] Slurry preparation is an important process in the production of lithium-ion batteries. The uniformity of the mixing is related to the subsequent manufacturing process of the battery and whether the positive and negative active materials of the battery can fully exert their characteristics. The raw materials of the battery slurry include positive and negative electrode active materials (general positive electrode lithium cobaltate LiCoO2, negative electrode graphite, mesophase carbon microspheres (MCMB), etc.), conductive agent, thickener (for negative electrode slurry), binder and Solvent, the above substances must be fully stirred evenly when preparing the battery slurry. The traditional preparation method is to firstly stir...

Claims

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Application Information

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IPC IPC(8): H01M4/04
CPCY02E60/12Y02E60/10
Inventor 韦小马石琛
Owner BAODING FENGFAN NEW ENERGY
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