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Aqueous lithium iron phosphate positive electrode slurry as well as preparation method and application thereof

A technology of lithium iron phosphate and positive electrode slurry, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of oily system lithium iron phosphate slurry, such as environmental pollution, high density on one side, and high energy density, and achieve flexibility Effects of high strength, enhanced fluidity, and good thixotropic properties

Pending Publication Date: 2022-05-10
广东羚光新材料股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned technical problems, the present invention provides a water-based lithium iron phosphate positive electrode slurry, which solves the problems of environmental pollution and high cost of the oily system lithium iron phosphate slurry, and the stickiness of the positive electrode slurry after coating High strength, no cracking, high density on one side, high energy density

Method used

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  • Aqueous lithium iron phosphate positive electrode slurry as well as preparation method and application thereof
  • Aqueous lithium iron phosphate positive electrode slurry as well as preparation method and application thereof
  • Aqueous lithium iron phosphate positive electrode slurry as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A water-based lithium iron phosphate positive electrode slurry is prepared in the following manner:

[0056] 1. Prepare compound glue.

[0057] Stir and mix 1.3 parts of acrylic resin powder with 106 parts of deionized water, and then stir in a planetary slurry mixer at a low speed. After mixing at a low speed, turn on the vacuum, the stirring time is 30min, the stirring speed is 30r / min, and the dispersion speed is 2000r / min, the relative vacuum is -90kPa~-100kPa, and the acrylic resin water-based glue containing the acrylic resin of 1.3% in mass percent concentration is obtained;

[0058] Add 11.33 parts of NV-1A glue in the acrylic resin water-based glue, the solid content of the NV-1A glue is 15%, and the solid matter after 11.33 parts of NV-1A glue is dried, that is, NV-1A glue It is 1.7 parts, then stir at a low speed in a planetary slurry mixer, start vacuuming after mixing at a low speed, the stirring time is 35 minutes, the stirring speed is 30r / min, the disp...

Embodiment 2

[0069] A water-based lithium iron phosphate positive electrode slurry is prepared in the following manner:

[0070] 1. Prepare compound glue.

[0071] Stir and mix 1.15 parts of acrylic resin powder with 106 parts of deionized water, and then stir in a planetary slurry mixer at a low speed. After mixing at a low speed, turn on the vacuum, the stirring time is 30min, the stirring speed is 30r / min, and the dispersion speed is 2000r / min, the relative vacuum is -90kPa~-100kPa, and the acrylic resin water-based glue that contains the acrylic resin with a mass percentage concentration of 1.1% is obtained;

[0072] Add 12.33 parts of NV-1A glue solution in the described acrylic resin water-based glue solution, the solid content of this NV-1A glue solution is 15%, the solid matter after 12.33 parts of NV-1A glue solution drying, namely NV-1A glue solution It is 1.85 parts, then stir at a low speed in a planetary slurry mixer, start vacuuming after mixing at a low speed, the stirring...

Embodiment 3

[0083] A water-based lithium iron phosphate positive electrode slurry is prepared in the following manner:

[0084] 1. Prepare compound glue.

[0085] Stir and mix 1.3 parts of acrylic resin powder with 100 parts of deionized water, and then stir in a planetary slurry mixer at a low speed. After mixing at a low speed, turn on the vacuum, the stirring time is 35min, the stirring speed is 30r / min, and the dispersion speed is 2000r / min, the relative vacuum is -90kPa~-100kPa, and the acrylic resin water-based glue containing the acrylic resin of 1.3% in mass percent concentration is obtained;

[0086] Add 13.33 parts of NV-1A glue solution in the described acrylic resin water-based glue solution, the solid content of this NV-1A glue solution is 15%, the solid matter after 13.33 parts of NV-1A glue solution drying, namely NV-1A glue solution It is 2 parts, then stir at a low speed in a planetary slurry mixer, start vacuuming after mixing at a low speed, the stirring time is 40 minu...

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Abstract

The invention relates to aqueous lithium iron phosphate positive electrode slurry which comprises the following raw materials in parts by weight: 90-94 parts of lithium iron phosphate, 3-5 parts of a conductive agent, 1-1.8 parts of acrylic resin, 1.3-2.5 parts of NV-1A glue, 107-111 parts of deionized water and 5-8 parts of a defoaming agent. The slurry solves the problems of environmental pollution, high cost and the like of an oily system lithium iron phosphate slurry, and the positive electrode slurry has the advantages of high adhesion strength, no cracking, high single surface density and high energy density after being coated.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion battery slurry, in particular to a water-based lithium iron phosphate positive electrode slurry and a preparation method and application thereof. Background technique [0002] The positive electrode slurry is the basis of an important pole in the two poles (positive and negative electrodes) of lithium-ion batteries. The existing lithium iron phosphate positive electrode slurry for lithium-ion batteries is prepared with an oily system (NMP is used as a solvent) and an aqueous system (deionized water is used as a solvent). solvent) two processing techniques. The oil-based process has high requirements on the environment and materials, and is prone to problems such as difficult recovery of organic solvents, high cost, and environmental pollution. It is necessary to control the humidity in the workshop. If you are not careful, the slurry in the oil-based process is prone to absorb w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/621H01M4/362H01M4/625H01M10/0525Y02E60/10
Inventor 丁锡辉董民运曾盛芳陈莹林婉婷丁美蓉娄红涛黄润鸿冼子宁
Owner 广东羚光新材料股份有限公司
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