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
View PDF5 Cites 14 Cited by
  • 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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1:

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

[0031] S2: Preparation of conductive dispersion: add 0.5% dispersant and part of deionized water to the No. 2 mixing tank and stir at 1000rpm / min for 20min, then add 2% conductive agent in batches at 1800rpm / min Stir at a speed of 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 the No. 3 agitator and stir at 1000 rpm / min for 20 minutes, then add 47% lithium iron phosphate in batches at 1800 rpm Stir at a speed of 120 min / min to prepare a lithium iron phosphate dispersion;

[0033] S4: One-time mixing and dispersion: Add the conductive agent dispersion prepared by S2 to S1, stir at high speed for 90 minutes to prepare a ...

Example Embodiment

[0036] Example 2:

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

[0038] S2: Preparation of conductive dispersion: Add 0.7% dispersant and part of deionized water to the No. 2 mixing tank and stir at 1000rpm / min for 20min, then add 3% conductive agent in batches at 1800rpm / min Stir at a speed of 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 agitating tank and stir at 1000rpm / min for 20min, then add 45% lithium iron phosphate in batches at 1800rpm Stir at a speed of 120 min / min to prepare a lithium iron phosphate dispersion;

[0040] S4: One-time mixing and dispersion: Add the conductive agent dispersion prepared by S2 to S1, stir at high speed for 90 minutes to prepare a conductive glu...

Example Embodiment

[0043] Example 3:

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

[0045] S2: Preparation of conductive dispersion: add 1% dispersant and part of deionized water to the No. 2 agitator and stir at 1000rpm / min for 20min, then add 4% conductive agent in batches at 1800rpm / min Stir at a speed of 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 agitating tank and stir at 1000rpm / min for 20min, and then add 50% lithium iron phosphate in batches at 1800rpm Stir at a speed of 120 min / min to prepare a lithium iron phosphate dispersion;

[0047] S4: One-time mixing and dispersion: Add the conductive agent dispersion prepared by S2 to S1, stir at high speed for 90 minutes to p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap