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Lithium ion battery positive plate water coating adhesive and preparing method thereof

A lithium-ion battery, water-based coating technology, applied in the direction of battery electrodes, adhesives, adhesive types, etc., can solve problems such as insufficient adhesion and imperfect adhesion of adhesives, and achieve uniform dispersion and good appearance Brighter and more beautiful, strong adhesive effect

Inactive Publication Date: 2008-07-02
林云青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the three-component adhesive also has defects, that is, coarse particles often appear in the prepared slurry, and the adhesive force of the adhesive is not perfect, especially for LiFePO 4 Insufficient adhesion of new cathode material powder

Method used

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  • Lithium ion battery positive plate water coating adhesive and preparing method thereof
  • Lithium ion battery positive plate water coating adhesive and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In this example, the positive electrode material is LiCoO 2 (CITIC Guoan), the adhesion promoter is JN-105A (titanate fat coupling agent).

[0051] The following ingredients are LiCoO2: conductive agent: gelatin: PEO: SBR: JN-105A = 100: 3: 2: 0.7: 1: 0.5. First, dissolve PEO in 300ml of water for later use. Then dissolve the gelatin in 400ml of clean water. Then add 1000 grams of LiCoO2 powder to the gelatin solution and stir it. Finally, add SuperP carbon black in three batches and stir at high speed for 2-3 hours. Then add 10 grams of SBR in turn, the pre-prepared PEO solution and JN-105A continue to stir for 2-3 hours. After defoaming treatment and sieving, the slurry available for coating is obtained.

[0052] The resulting slurry is not easy to sink, uniformly dispersed, no fine particles at the bottom, black and shiny. The electrochemical performance of the positive sheet battery obtained with such a slurry is comparable to that of the oil-phase battery. F...

Embodiment 2

[0054] In this example, the positive active powder is Lithium Iron Phosphate (LiFePO 4 ). Same as Comparative Example 1, PEO is also used as thickener, and SBR latex is used as auxiliary adhesive. Although the slurry prepared with the three-component adhesive of Comparative Example 1 can also be coated, the coating of the obtained pole piece is not firmly bonded to the aluminum foil. In this example, LiFePO 4 : conductive carbon black: gelatin: PEO: SBR: titanate coupling agent (JN-AT) = 100:3:3:1:4:0.5 ingredients.

[0055] First, dissolve 30 grams of gelatin in 1200 ml of purified water at 50°C to form a transparent solution. Then, 1000 g LiFePO 4 Slowly add to the gelatin solution under stirring, and stir for half an hour. Except that 40 grams of SBR latex and 5 grams of water-based JN-AT titanate were added in this example as an adhesion promoter, the rest of the procedures were the same as in Comparative Example 1. According to this method, more uniform dispersion, ...

Embodiment 3

[0057] Polyacrylamide with a molecular weight of 430,000 is used as a thickener, and water-based titanate is used as an adhesion enhancer, according to LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 : conductive agent: gelatin: polyacrylamide: SBR: titanate = 100:3:1:0.7:1.5:0.5 ingredients.

[0058] First, dissolve 10 grams of gelatin with 400ml of pure water to obtain a transparent gelatin solution, then slowly add LiNi under stirring 1 / 3 co 1 / 3 mn 1 / 3 o 2 Ternary cathode material powder. After the addition is complete, stir at a high speed of 300 RPM for half an hour. Then add 20 grams of conductive agent Superp and 10 grams of KS2 to the above mixed liquid three times and continue to stir at high speed for 2 hours. After the slurry is roughly mixed, add 15 grams of SBR and 5 grams of JN-AT titanate and stir for another half an hour. Finally, a pre-made solution of polyacrylamide dissolved in 300 ml of water was added. After stirring for another 2-3 hours, the resulting slurry has goo...

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Abstract

An aqueous coating adhesive for a positive electrode sheet of a lithium ion battery relates to the field of battery manufacture technique. The adhesive is obtained by mixing and stirring uniformly a main adhesive, a thickening agent, an auxiliary adhesive and an adhesion-enhanced surfactant. The adhesive of the invention has the advantages of strong adhesion, more uniform diffusion of slurry material, and more fresh and beautiful appearance of the coated electrode sheet, thus meeting the requirement for scale production of the positive electrode sheet of the lithium ion battery and achieving water-phase coating manufacture of the positive electrode sheet of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing. Specifically, it is an adhesive used for a positive electrode sheet of a rechargeable lithium ion battery, and a method for preparing the adhesive. Background technique [0002] Lithium-ion battery is a high-performance rechargeable battery. Due to its high operating voltage, high energy density, long life, no memory effect, low self-discharge rate, and environmental friendliness, it is now widely used in various portable electronics Equipment, developed into a considerable scale industry. Although the relevant materials and manufacturing technology of lithium-ion batteries have made great progress in recent years, for example, the strength of the current collector copper foil has also been greatly improved, and the thickness has been reduced to 10 μm, and the thickness of the current collector aluminum foil has also been reduced to 20 μm. From the initial petroleum coke and mesoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J189/00H01M4/62C09J123/16C09J109/02C09J109/06
CPCY02E60/10
Inventor 林云青王岩
Owner 林云青
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