Batching method of lithium ion battery positive electrode slurry

A technology for lithium ion battery and positive electrode slurry, applied in the field of lithium ion battery, can solve the problems such as the large weight difference between the active material and the conductive agent and other auxiliary materials, the agglomeration of the conductive agent particles is not easy to disperse, and the energy consumption in the kneading process is large. Eliminate the viscosity adjustment process, reduce the difficulty of the batching process, and accelerate the effect of wetting and dispersion

Active Publication Date: 2020-12-25
FENGFAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an extremely important process in the production process of lithium-ion batteries, there are still some problems at present, such as: due to the large weight difference between the active material and the conductive agent and other auxiliary materials, it is difficult to mix evenly in the simple premixing stage, and the conductive agent particles are small Agglomeration is ubiquitous and difficult to disperse, the slurry mixing process in the conventional process takes too long, and the kneading process consumes a lot of energy and equipment loads. Higher power is required to improve the dispersibility of lithium ion positive and negative electrode slurry, especially the dispersion performance. Type batteries are an area in dire need of improvement

Method used

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  • Batching method of lithium ion battery positive electrode slurry
  • Batching method of lithium ion battery positive electrode slurry
  • Batching method of lithium ion battery positive electrode slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The ratio of the positive electrode slurry formula is: ternary material NCM111: super-P: CNT (5% solid content slurry): PVDF=95%: 2%: 1%: 2%; the solvent is NMP, and the positive electrode slurry The solid content is 67%.

[0038] (1) Put the ternary material NCM111 with a D50 particle size of 5 μm and the conductive carbon black super-P with a formula content of 30% into the mechanical fusion machine, and quickly premix and disperse for 30 minutes at a speed of 1500 rpm to obtain a premix Composite material;

[0039] (2) Add PVDF 6020 into the planetary mixer according to the positive electrode formula, add NMP according to the ratio of PVDF:NMP=7:93, start the revolution and the rotation of the dispersion disc, the revolution speed of the planetary mixer is 25 rpm and disperse The rotation speed of the disc is 1200 rpm, and after stirring for 4 hours, PVDF glue is obtained; add the remaining 70% conductive carbon black super-P and CNT slurry to the glue, turn on the ...

Embodiment 2

[0044] The formula ratio of positive electrode slurry is: ternary NCM523: lithium manganese oxide: super-P: ECP (10% solid content slurry): PVDF=66.15%: 28.35%: 2%: 1.5%: 2%; solvent is NMP , the solid content of the positive electrode slurry was 68.5%.

[0045] (1) Put the ternary material NCM523 with a D50 particle size of 4 μm, lithium manganate with a D50 of 10 μm, and conductive carbon black super-P with a formula ratio of 30% into the mechanical fusion machine, and quickly premix and disperse for 30 minutes to obtain premixed materials;

[0046] (2) Add PVDF 5120 according to the positive electrode formula into the planetary mixer, add NMP according to the ratio of PVDF:NMP=7:93, turn on the revolution and the rotation of the dispersing disc, and get PVDF glue after stirring for 4 hours; Add the remaining 70% conductive carbon black super-P and ECP slurry, turn on the revolution at 10 rpm and stir slowly for 20 minutes, adjust the revolution at 30 rpm, disperse at 1500 ...

Embodiment 3

[0051] The positive electrode slurry formula ratio is: lithium iron phosphate LFP: super-P: graphene (slurry with a solid content of 5%): PVDF=93%: 3.5%: 1.5%: 2%; the solvent is NMP, and the positive electrode The solid content of the slurry was 50%.

[0052] (1) Add lithium iron phosphate LFP with a D50 of 0.4 μm, conductive agent A super-P and PVDF into an intensive mixer, and mix for 5 minutes to obtain a premix;

[0053] (2) Add the conductive agent B graphene slurry and NMP into the double planetary mixer, turn on the revolution speed of the mixer at 25 rpm, disperse at 800 rpm, and slowly add the above premix through the upper feeding port of the mixer;

[0054] (3) After adding the premix, adjust the revolution speed to 45 rpm, disperse at 1200 rpm, stir at high speed for 60 minutes, and then vacuumize and stir for 90 minutes;

[0055] (4) Finally, put the slurry in step 3 into the continuous grinding and dispersing machine through the pipeline and grind it for 4 time...

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Abstract

Disclosed is a batching method of lithium ion battery positive electrode slurry. When a positive electrode active substance in the positive electrode slurry is one or more of a ternary material, lithium manganate or lithium cobalt oxide, the batching method comprises the following steps of: coating with a conductive agent; gluing with a binder; adding the rest of a conductive agent A and all of aconductive agent B into the glue solution, and stirring and wetting to obtain slurry I; pumping the prepared slurry I into a continuous grinding dispersion machine for circular grinding to obtain slurry II; transferring the slurry II into a double planetary stirrer for stirring, and slowly adding the prepared premixed composite material into the slurry II; and after the premixed composite materialis added, stirring at a high speed, vacuumizing, stirring at a low speed, and defoaming to obtain the positive electrode slurry. According to the invention, the grinding and dispersing process is added, so that the conductive material can be better and more quickly dispersed uniformly, the working efficiency is improved, and after the premixed composite material is added into the solvent, throughthe vacuum quick dispersing process from low viscosity to high viscosity, the generation of bubbles is reduced, the viscosity adjusting process is reduced, and the slurry mixing efficiency is improved.

Description

technical field [0001] The invention relates to a compounding method of positive electrode slurry of a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] With the depletion of traditional energy and the emphasis on environmental protection, people pay more and more attention to clean new energy. Due to the dual pressure of energy crisis and environmental protection, the development of energy-saving and new energy vehicles has become an important task in the automotive field of countries all over the world. As a secondary battery, lithium-ion battery has the advantages of high energy density, long cycle life and relatively low price, and has been widely used in mobile phones, notebook computers, portable electric tools, electronic instruments, energy storage and electric vehicles. [0003] The preparation of lithium-ion batteries mainly includes main processes such as slurry mixing, coating, sheet production, assembl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F3/12B01F13/10H01M4/04H01M10/0525B02C17/10B02C17/16B02C17/20B02C25/00
CPCH01M4/04H01M10/0525B02C17/10B02C17/163B02C17/20B02C25/00B01F23/51B01F23/511B01F23/53B01F23/59B01F33/83B01F33/83613Y02P70/50
Inventor 俞晓峰刘慧洁赵晓伟顾志华杨淑娟高良秋周宏
Owner FENGFAN
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