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Lithium iron phosphate water-based positive electrode slurry and preparation method thereof

A technology of lithium iron phosphate and positive electrode slurry, applied in the field of lithium ion batteries, can solve the problems of difficulty in dispersing lithium iron phosphate, increased difficulty in coating process, easy delamination of slurry, etc. The effect of high efficiency and improved electrical conductivity

Inactive Publication Date: 2020-06-05
SHENZHEN GPC ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the water-based system, nano-scale lithium iron phosphate is extremely difficult to disperse, easy to agglomerate, the prepared slurry is easy to separate, and the stability is poor, which leads to an increase in the difficulty of the coating process, thus limiting the nano-scale lithium iron phosphate cathode material. Use in aqueous systems

Method used

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  • Lithium iron phosphate water-based positive electrode slurry and preparation method thereof
  • Lithium iron phosphate water-based positive electrode slurry and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] S1: Preparation of composite glue: add 3% adhesive and part of deionized water to No. 1 mixing tank and stir at low speed for 30 minutes to prepare composite glue, wherein the stirring speed is 800rpm / min;

[0031] S2: Preparation of conductive dispersion: Add 0.5% dispersant and part of deionized water to No. 2 mixing tank and stir at a speed of 1000rpm / min for 20min, then add 2% conductive agent in batches, and stir at a speed of 1800rpm / min Stir at a high speed for 60 minutes to prepare a conductive agent dispersion;

[0032] S3: Preparation of lithium iron phosphate dispersion: add 1% dispersant and part of deionized water to No. 3 mixing tank and stir at a speed of 1000rpm / min for 20min, then add 47% lithium iron phosphate in batches, Stir at a speed of 120min for 120min to obtain a lithium iron phosphate dispersion;

[0033] S4: Primary mixing and dispersion: add the conductive agent dispersion prepared in S2 to S1, and stir at a high speed for 90 minutes to prep...

Embodiment 2

[0037] S1: Preparation of composite glue: add 4% adhesive and part of deionized water to No. 1 mixing tank and stir at low speed for 30 minutes to prepare composite glue, wherein the stirring speed is 800rpm / min;

[0038] S2: Preparation of conductive dispersion: Add 0.7% dispersant and part of deionized water to No. 2 mixing tank and stir at a speed of 1000rpm / min for 20min, then add 3% conductive agent in batches, and stir at a speed of 1800rpm / min Stir at a high speed for 60 minutes to prepare a conductive agent dispersion;

[0039] S3: Preparation of lithium iron phosphate dispersion: add 1% dispersant and part of deionized water to No. 3 mixing tank and stir at a speed of 1000rpm / min for 20min, then add 45% lithium iron phosphate in batches, at 1800rpm Stir at a speed of 120min for 120min to obtain a lithium iron phosphate dispersion;

[0040] S4: Primary mixing and dispersion: add the conductive agent dispersion prepared in S2 to S1, and stir at a high speed for 90 minu...

Embodiment 3

[0044] S1: Preparation of composite glue: add 2.5% adhesive and part of deionized water to No. 1 mixing tank and stir at low speed for 30 minutes to prepare composite glue, wherein the stirring speed is 800rpm / min;

[0045] S2: Preparation of conductive dispersion: Add 1% dispersant and part of deionized water to No. 2 mixing tank and stir at a speed of 1000rpm / min for 20min, then add 4% conductive agent in batches, Stir at a high speed for 60 minutes to prepare a conductive agent dispersion;

[0046] S3: Preparation of lithium iron phosphate dispersion: add 1% dispersant and part of deionized water to No. 3 mixing tank and stir at a speed of 1000rpm / min for 20min, then add 50% lithium iron phosphate in batches, and stir at 1800rpm Stir at a speed of 120min for 120min to obtain a lithium iron phosphate dispersion;

[0047] S4: Primary mixing and dispersion: add the conductive agent dispersion prepared in S2 to S1, and stir at a high speed for 90 minutes to prepare a conductiv...

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Abstract

The invention discloses lithium iron phosphate water-based positive electrode slurry and a preparation method thereof. The water-based slurry comprises the following components in percentage by mass:40%-50% of lithium iron phosphate powder, 2%-6% of a conductive agent, 2%-5% of a water-based binder, 0.5%-2% of a dispersing agent and the balance of deionized water. The preparation method comprisesthe following steps of: S1, preparing a composite glue solution, S2, preparing a conductive dispersion liquid, S3, preparing a lithium iron phosphate dispersion liquid, S4, mixing and dispersing forthe first time, S5, mixing and dispersing for the second time, and S6, conducting vacuum defoaming and standing. The lithium iron phosphate water-based positive electrode slurry prepared by the methodis uniform in dispersion, good in consistency and stability and convenient to coat; meanwhile, the solvent selected by the slurry is a water-based solvent, so that the slurry is environment-friendly,pollution-free and low in cost; the preparation method is simple and convenient to operate, high in production efficiency and suitable for batch production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium iron phosphate aqueous cathode slurry and a preparation method thereof. Background technique [0002] With the continuous development of industry, the pollution caused continues to increase. People began to pay attention to the harm of the environment to human health, and countries all over the world began to pay attention to environmental protection, and products related to green and environmental protection are more and more popular, such as "new energy vehicles". At present, lithium-ion batteries are mainly used in the manufacture of new energy vehicles, and lithium iron phosphate has the advantages of non-toxic, non-polluting, good safety performance, wide source of raw materials, cheap price, long life, etc., and has become a new generation of lithium-ion batteries for new energy vehicles. Ideal cathode material for ion batteries. [000...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 田军李国敏
Owner SHENZHEN GPC ENERGY GRP CO LTD
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