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Lithium iron phosphate anode slurry stirring technology

A lithium iron phosphate and stirring process technology, applied in electrode manufacturing, battery electrodes, nanotechnology for materials and surface science, etc., can solve the problems of poor dispersibility and poor consistency of lithium iron phosphate cathode slurry, and achieve consistency Excellent, good dispersion effect

Inactive Publication Date: 2017-10-27
江西安驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor dispersion and poor consistency of the existing lithium iron phosphate positive electrode slurry, the present invention proposes a lithium iron phosphate positive electrode slurry stirring process

Method used

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  • Lithium iron phosphate anode slurry stirring technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A lithium iron phosphate positive electrode slurry is prepared according to the following stirring process, which process includes:

[0034] (1) Add 75kg of conductive paste (6% solid content) and 8.75kg of NMP into the mixing tank; (2) Add 17kg of PVDF into the mixing tank, set the stirring speed to 15Hz, the dispersion speed to 400 rpm, and stir for 50min; (3) Add 350kg of lithium iron phosphate and 4kg of conductive carbon black, set the stirring speed to 30Hz, and disperse at 800 rpm, and dry mix for 150min; (4) Add 180kg of NMP, set the stirring speed to 30Hz, and the dispersion speed When the temperature is 1200 rpm, stir for 120min; (5) reverse defoaming, set the stirring speed to 15Hz, and stir for 30min; (6) detect the viscosity value of the slurry is 7000-13000mPa·s, and the fineness of the slurry is ≤30um , the solid content is 50-65%, and the slurry preparation is completed.

Embodiment 2

[0036] The difference from Example 1 is that the amount of NMP added in the step (1) is 12.25kg.

Embodiment 3

[0038] Different from Example 1, the amount of NMP added in the step (1) is 15.75kg.

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Abstract

The invention relates to a lithium iron phosphate anode slurry stirring technology which comprises the following steps: (1) adding conductive slurry and NMP according to a weight ratio being (6-9) to (1-4) in a stirring tank, wherein the conductive slurry is one or two of graphene slurry and carbon nanotube slurry; (2) adding PVDF in the stirring tank, and stirring for 20-60min; (3) adding lithium iron phosphate and conductive carbon black, dry blending for 80-180min; (4) adding NMP, stirring for 60-150min; (5) carrying out reverse stirring for defoaming; (6) detecting and regulating parameters of slurry, and preparing the slurry, wherein a solvent of the conductive slurry is the NMP, the concentration is 4-10 percent, and the weight of the NMP added in the step (1) is 2-5 percent of that of the lithium iron phosphate. The lithium iron phosphate anode slurry prepared by the stirring technology provided by the invention is good in dispersibility and excellent in consistency.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium iron phosphate cathode slurry stirring process. Background technique [0002] With the continuous improvement of social energy-saving awareness and the continuous improvement of lithium-ion battery manufacturing technology, lithium iron phosphate cathode materials have been widely used. Although lithium iron phosphate has the advantages of good safety performance, long cycle life, wide source of raw materials, and no pollution, etc. , but at the same time there is a fatal shortcoming of poor conductivity. In order to improve conductivity, graphene and carbon nanotubes with high conductivity are added when preparing lithium iron phosphate cathode slurry, such as patent CN105047918A, patent CN103872287A and patent CN101562248A, etc., but Since graphene and carbon nanotubes are easy to agglomerate and difficult to disperse, the lithium iron phosph...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/04H01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 白科谢佳刘晟钢郭娜娜赵阳关
Owner 江西安驰新能源科技有限公司
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