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Fractional homogenate technology of cathode slurry of lithium ion battery

A lithium-ion battery and positive electrode slurry technology, which is applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of reducing the performance of electrode slurry, overloading energy consumption of the mixer, reducing the physical and chemical performance indicators of slurry, etc.

Inactive Publication Date: 2019-08-02
SHUANGDENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process uses a sufficient amount of active material to be added at one time, which has certain side effects in the homogenization process, and even reduces the performance of the prepared electrode slurry
The crux of the problem is that during high-speed dispersion, there is a large friction between the active material and the cylinder wall of the equipment. The heat generated by the high-speed friction directly causes the temperature of the slurry to rise. Once the temperature exceeds the specified value, some raw materials in the slurry will be denatured. Thereby reducing the original physical and chemical properties of the slurry
In addition, long-term high-speed stirring still has the problems of overloading the mixer and large energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. First, measure the following raw materials according to the predetermined components: 85.2kg of PVDF glue with a solid content of 4.0%, 3.21kg of SP and 1.28kg of KS-6 conductive agents, 120kg of active materials for lithium iron phosphate, and 17.62kg of NMP solvent.

[0022] b. Put the SP, KS-6 conductive agent and PVDF glue measured according to the predetermined components into the mixer, and mix together for 50 minutes at a stirring speed of 20 rpm and a dispersion speed of 2000 rpm.

[0023] c. Take 1 / 2 of the total amount of lithium iron phosphate and put it into the mixer. After the lithium iron phosphate is dissolved, mix together for 20 minutes at a stirring speed of 20 rpm and a dispersion speed of 2000 rpm.

[0024] d. On the basis of the previous process, put the remaining lithium iron phosphate into the mixer, and after the lithium iron phosphate is dissolved, mix together for 60 minutes at a stirring speed of 20 rpm and a dispersion speed of 1200 rpm. ...

Embodiment 2

[0028] a. First, measure the following raw materials according to the predetermined components: 85.2kg of PVDF glue with a content of 4.5%, 4.49kg of SP conductive agent, 120kg of active material of lithium iron phosphate, and 17.62kg of NMP solvent.

[0029] b. Put the SP conductive agent and PVDF glue measured according to the predetermined components into the mixer together, and mix together for 70 minutes at the stirring speed of 22 rpm and the dispersion speed of 2200 rpm.

[0030] c. Measure the active material according to the established components, take out 1 / 3 of the total amount of lithium iron phosphate and put it into the mixer. After the lithium iron phosphate is dissolved, stir at 22 rpm and 2200 rpm Mix for 40 minutes.

[0031] d. On the basis of the previous procedure, add the remaining 2 / 3 of the lithium iron phosphate into the mixer in two equal parts. Mix together for 40 minutes at a dispersion speed of 1 minute.

[0032] e. Add solvent after step d, and ...

Embodiment 3

[0035] a. First, measure the following raw materials according to the predetermined components: 85.2kg of PVDF glue with a content of 6%, 4.49kg of KS-6 conductive agent, 120kg of active material of lithium iron phosphate, and 17.62kg of NMP solvent.

[0036] b. Put the KS-6 conductive agent and PVDF glue measured according to the predetermined components into the mixer, and mix together for 90 minutes at a stirring speed of 30 rpm and a dispersion speed of 2500 rpm.

[0037] c. Take 1 / 2 of the total amount of lithium iron phosphate and put it into the mixer. After the lithium iron phosphate is dissolved, mix together for 60 minutes at a stirring speed of 25 rpm and a dispersion speed of 2500 rpm.

[0038] d. On the basis of the previous process, put the remaining lithium iron phosphate into the mixer, and after the lithium iron phosphate is dissolved, mix together for 20 minutes at a stirring speed of 25 rpm and a dispersion speed of 1800 rpm.

[0039] e. Add solvent after st...

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PUM

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Abstract

The invention discloses a fractional homogenate technology of a cathode slurry of a lithium ion battery. The technology comprises the following steps that a PVDF glue solution is measured according toset components, a measured conductive agent and the PVDF glue solution are input to a mixer and mixed, 1 / 3-1 / 2 of a measured active substance is removed, and input to the mixer for mixing; the residual active substance is added to the mixer for mixing once or twice; and a solvent is added and mixed, and the cathode slurry after homogenate is deareated in the vacuum condition for at least 2 hoursafter homogenate. The homogenate technology in which active substance is added in a fractional manner and the speed is reduced gradually is used, friction between the active substance and the inner wall of the mixer is obviously reduced, and it is ensured the temperature of the cathode slurry does not exceed 50 DEG C during homogenate.

Description

technical field [0001] The invention belongs to a technical solution in the technical field of electrochemical battery manufacturing. Specifically, the invention relates to an electrode slurry homogenization process, especially a step-by-step homogenization process for lithium-ion battery positive electrode slurry. Background technique [0002] Electrode slurry is an indispensable material for making lithium-ion batteries. It is made of a mixture of predetermined multi-component materials. The quality of slurry mixing directly affects the performance of the prepared lithium-ion battery. Under the existing process conditions, the electrode slurry is mixed and homogenized by mechanical means. The specific process is as follows: firstly, the binder is fully dispersed into the solvent with a glue machine, and a certain concentration of glue is obtained by mixing, and then the The glue is transferred to the mixer, pre-dispersed after adding a predetermined amount of conductive ag...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 韩云峰卢珊珊王富存
Owner SHUANGDENG GRP
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