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Preparation method of lithium ion battery slurry

A lithium-ion battery and slurry technology, which is applied in the field of lithium-ion battery slurry preparation, can solve the problems of difficult uniform dispersion of powder, difficulty in suspension stability, and low utilization rate of equipment, so as to improve mixing uniformity, Effect of shortening mixing and stirring time and reducing production cost

Inactive Publication Date: 2017-05-31
SHENZHEN TOPBAND NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. It is difficult for the powder to disperse evenly into the liquid solvent;
[0005] 2. It is difficult for the powder to maintain long-term suspension stability in the solvent;
[0006] 3. The mixing time is long and the energy consumption of the equipment is high;
[0007] 4. Low equipment utilization

Method used

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  • Preparation method of lithium ion battery slurry
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preparation example Construction

[0027] The invention discloses a preparation method of lithium-ion battery slurry, which rapidly mixes raw materials evenly by adopting the method of variable speed and reversing stirring during the stirring process, and can efficiently prepare a slurry with good dispersibility and stability. The lithium-ion battery slurry uses the principle of chaotic mixing to improve the mixing efficiency, shorten the mixing time and improve the mixing uniformity, so that the energy consumption in the production process is low, the production efficiency is improved, and the production cost is reduced.

[0028] refer to figure 1 , the preparation method of lithium ion battery slurry of the present invention, comprises the following steps:

[0029] S1. Mix the active material and additives at a low speed to form a mixed powder. In this step, the mixing time is 10-30 minutes, and the low speed is 10-20 r / min. The mixing method is not subject to specific restrictions and can be selected accord...

Embodiment 1

[0046] Set each of the following to represent 1000g;

[0047] Take 2.5 parts of PVDF (polyvinylidene fluoride), 2 parts of Super-P (conductive carbon black), 1 part of KS-6 (conductive graphite) and 94.5 parts of lithium iron phosphate, add them to a mixer and mix them uniformly for 20 minutes at a speed of 10r to form Mix powder. Add 47 parts of N-methylpyrrolidone, accelerate the stirring from 0r / min to 30r / min, stir at a constant speed for 5min, stop stirring, decelerate the stirring speed from 30r / min to 0r / min, start the reverse stirring, and accelerate the stirring from 0r / min To 30r / min, stir at a constant speed for 5min, and so on. During the process, the dispersion continued to run at a speed of 15m / s, and the total time was 80 minutes. After adding 53 parts of N-methylpyrrolidone, vacuumize to -0.095Mpa, accelerate from 0r / min to 30r / min, stir at a constant speed for 5min, stop stirring, slow down from 30r / min to 0r / min, start reverse Stirring, the stirring is acc...

Embodiment 2

[0049] Set each of the following to represent 1000g;

[0050] Take 1.5 parts of CMC (sodium carboxymethyl cellulose), 1.5 parts of Super-P (conductive carbon black), and 94.8 parts of artificial graphite, add them into a mixer and mix them uniformly for 30 minutes at a speed of 10r to form a mixed powder. Add 48 parts of deionized water, stir from 0r / min to 30r / min, stir at a constant speed for 5min, stop stirring, slow down from 30r / min to 0r / min, start reverse stirring, and accelerate from 0r / min to 30r / min, stir at a constant speed for 5min, and so on. During the process, the dispersion continued to run at a speed of 18m / s, and the total time was 90 minutes. After adding 52 parts of deionized water, vacuumize to -0.095Mpa, accelerate the stirring from 0r / min to 30r / min, stir at a constant speed for 5min, stop stirring, slow down the stirring speed from 30r / min to 0r / min, start reverse stirring, Stirring is accelerated from 0r / min to 30r / min, stirring at a constant speed ...

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Abstract

The invention relates to a preparation method of lithium ion battery slurry. The preparation method of the lithium ion battery slurry comprises the following steps: S1, mixing an active material and aids at low speed to form mixed powder; S2, adding part of solvent into the mixed powder, performing variable-speed and positive and negative rotation reversing stirring, and mixing uniformly to form a mixed material; S3, adding the residual solvent into the mixed material, performing variable-speed and positive and negative rotation reversing stirring under the vacuum state, and dispersing uniformly to form the lithium ion battery slurry. The raw materials can be mixed uniformly by adopting variable-speed and positive and negative rotation reversing stirring in the stirring process, the mixing efficiency is improved by utilizing a chaotic mixing principle, and the aims of shorting the mixing and stirring time and improving the mixing uniformity are fulfilled, so that energy consumption is reduced and production efficiency is improved in the production process, and production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and more specifically, relates to a preparation method of slurry for lithium ion batteries. Background technique [0002] Due to its outstanding advantages such as light weight, large energy storage, high power, no pollution, long life, small self-discharge coefficient, and wide temperature range, lithium-ion batteries are the best choice for mobile devices and automotive power sources, and have a bright future broad. [0003] Lithium-ion batteries are obtained by winding the positive and negative electrodes and the separator into a cell, and then filling the case with electrolyte. The positive and negative electrode sheets are obtained by dispersing the active materials of the positive and negative electrodes in a solvent to form a slurry, and then uniformly coating the slurry on the current collector and drying it. This kind of slurry not only has positive and negative active ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/58H01M4/583H01M4/04H01M10/0525H01M10/0587
CPCH01M4/0404H01M4/505H01M4/525H01M4/5825H01M4/583H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 赖真龙武永强
Owner SHENZHEN TOPBAND NEW ENERGY CO LTD
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