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Aqueous adhesive and preparation method thereof

A water-based adhesive and adhesive technology, used in non-aqueous electrolyte batteries, electrical components, electrochemical generators, etc. Fluid and other issues, to achieve the effect of a wide range of market application value

Active Publication Date: 2019-09-10
BLUE OCEAN & BLACK STONE TECH CO LTD FUJIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing water-based adhesives cannot adjust the pH of the slurry during use. During the storage of the slurry, as the pH changes, the viscosity of the slurry will fluctuate accordingly, which will affect the consistency of the pole piece coating; In addition, the current collector of the positive electrode plate is made of aluminum foil, which itself is an amphoteric substance, that is, it will participate in the reaction under the condition of overacid or overalkali, and release gas, that is, corrode the positive electrode current collector.
Therefore, the existing water-based adhesives cannot meet the needs of lithium-ion batteries for slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Dissolve 3 parts of polyacrylamide in the reaction kettle, after the polyacrylamide is completely dissolved, add 0.8 parts of sodium vinyl sulfonate, 30 parts of ethyl acrylate, 15 parts of methacrylic acid and 5 parts of vinyl acetate , raise the temperature to 68°C, quickly add 0.4 parts of ammonium persulfate solution, react for 180 minutes, and prepare the first-stage polymer; keep the temperature constant after the reaction is completed, quickly add 10 parts of vinyl acetate and 0.1 parts of ammonium persulfate solution, Maintain a constant temperature of 68°C for 60 minutes. After the reaction is completed, prepare a pre-emulsion with 30 parts of ethyl acrylate and 10 parts of vinyl acetate in 0.35 parts of sodium dodecylbenzenesulfonate, and mix the pre-emulsion with 0.3 parts of persulfuric acid The ammonium solution is slowly added dropwise, and the dropwise addition is completed in 180 minutes. The temperature is raised to 70°C and kept for 240 minutes; the wat...

Embodiment 2

[0034] Mix 40g of the adhesive prepared in Example 1 and 85g of water, stir slowly for 5min, add 4g of conductive agent Super P and stir at high speed for 100min, then add 188g of positive electrode ternary material (NCA811) and stir at high speed for 100min, and the prepared positive electrode ternary material slurry The solid content of the slurry is 70%, and the viscosity is 5000cP.s. The slurry is placed for 24 hours. The viscosity and pH of the slurry have no obvious changes. It is coated on the aluminum foil, and the appearance is good, and no exposed foil and bubbles are formed. The viscosity and pH data changes of the slurry are shown in Table 1:

[0035] Viscosity and pH data change of table 1 slurry

[0036] time 0h 1h 4h 24h viscosity 5000 6000 8000 9200 pH 8.4 9 9.4 9.8

[0037] Disperse 188g of positive electrode ternary material in 129g of water at high speed for 20 minutes, then let the slurry stand still, and test its pH valu...

Embodiment 3

[0042] In this example, 3 parts of polyacrylamide were dissolved in the reaction kettle, and after the polyacrylamide was completely dissolved, 0.8 parts of sodium vinyl sulfonate, 30 parts of butyl acrylate, 15 parts of methacrylic acid and 5 parts of vinyl acetate, raise the temperature to 68°C, quickly add 0.4 parts of ammonium persulfate solution, react for 240 minutes, and prepare the front-end polymer; keep the temperature constant after the reaction is completed, quickly add 5 parts of vinyl acetate and 0.1 parts of Ammonium persulfate solution, kept at a constant temperature of 68°C for 30 minutes, after the reaction was completed, 30 parts of butyl acrylate, 10 parts of vinyl acetate and 10 parts of methacrylic acid were prepared in 0.3 parts of sodium dodecylbenzenesulfonate Pre-emulsion, slowly add the pre-emulsion and 0.3 parts of ammonium persulfate solution dropwise, after 240 minutes, the dropwise addition is completed, raise the temperature to 70°C, and keep it ...

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PUM

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Abstract

The invention discloses an aqueous adhesive prepared by a following method including: (1) mixing a carboxyl-containing functional monomer, a vinyl acetate monomer and an acrylate monomer under the action of protective gel and performing front-segment copolymerization to form a front segment of the adhesive; (2) after the front-segment copolymerization is finished, adding the vinyl acetate monomerfor middle-segment polymerization to form the middle segment of the adhesive; and (3) after the middle-segment polymerization is finished, adding dropwise a pre-emulsion prepared from the carboxyl-containing functional monomer, the vinyl acetate monomer and the acrylate monomer in advance, and forming the rear segment of the adhesive after the reaction is finished. The adhesive can adapt to pulping and coating processes under a high-alkalinity environment, is suitable for a ternary material of a lithium ion battery, can stabilize or adjust the pH value of the ternary material slurry of the lithium ion battery, and has a wide market application prospect.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a water-based adhesive used for lithium-ion battery ternary materials and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries that developed rapidly in the 1990s. They are widely used in small portable electronic communication products and electric vehicles. The performance of battery materials is the core link in the lithium battery industry. Battery materials are divided into positive electrode materials, negative electrode materials, separators, electrolytes, etc. Cathode material is one of the key materials for manufacturing lithium-ion batteries, accounting for more than 25% of the battery cost, and its performance directly affects various performance indicators of the battery. [0003] With the rapid development of lithium-ion batteries, the current requirement for lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00H01M4/62
CPCC08F293/00H01M4/622Y02E60/10C08F2/22C08F285/00H01M4/131H01M4/505H01M4/525C08F265/10C08F265/06C08F2/44H01M10/0525C08F220/1802C08F218/08C08F220/1804C08F220/06C08F228/02C08F222/02C08F216/1475C08F220/10H01M10/052
Inventor 罗贺斌白丰瑞
Owner BLUE OCEAN & BLACK STONE TECH CO LTD FUJIAN
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