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Aqueous binder, preparing method thereof and electrode slice, isolating membrane and cell using aqueous binder

A technology of water-based adhesives and lithium-ion batteries, which is applied in the direction of non-aqueous electrolyte batteries, electrolyte battery manufacturing, secondary batteries, etc., can solve the problems of easy powder falling, unreasonable adhesives, and hard pole pieces, etc., and achieve reduction The use of organic solvents, the improvement of charge and discharge kinetics, and the effect of increasing ion conductivity

Active Publication Date: 2015-09-30
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in the process of large-scale use of water-based adhesives, the main problems are: first, due to the unreasonable selection of adhesives, the bonding performance is very poor, and it is easy to drop powder; second, due to the relatively high surface tension of water High, the mass proportion of powder is large, the slurry is difficult to mix evenly, and it is difficult to level when baking
Third, the pole piece made is harder

Method used

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  • Aqueous binder, preparing method thereof and electrode slice, isolating membrane and cell using aqueous binder
  • Aqueous binder, preparing method thereof and electrode slice, isolating membrane and cell using aqueous binder
  • Aqueous binder, preparing method thereof and electrode slice, isolating membrane and cell using aqueous binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Embodiment 1: the preparation of sample 1#~sample 16#

[0086] As shown in Table 1, add the monomers of fluorine-containing polymer A and fluorine-free lipophilic polar polymer B into a non-water-soluble solvent, mix well, start mechanical stirring, and rotate at 600 rpm until the solids are evenly dispersed , to get System I. Put the monomer of the hydrophilic polymer M into a certain amount of deionized water, start stirring at a speed of 100 rpm, until the monomer of the hydrophilic polymer M is completely dissolved, add an emulsifier, and disperse evenly to obtain System II. Mix system I and system II, fully emulsify under mechanical stirring, adjust pH value with phosphate buffer solution, vacuumize, remove non-water-soluble solvent, and obtain system III. Introduce nitrogen or inert gas into System III, remove the air for 1 hour, add the initiator dropwise to System III at a certain temperature, and after a period of reaction, vacuumize and degas to adjust the so...

Embodiment 2

[0091] Embodiment 2: the preparation of sample 17#~19#

[0092] Add 90g of vinylidene fluoride, 0.5g of methyl methacrylate and 0.5g of acrylonitrile into 450g of ethyl acetate, mix well, start mechanical stirring at 600 rpm, until the solids are evenly dispersed, and system I is obtained. Add 20g of lithium acrylate to 480g of deionized water, start stirring at 100 rpm until the lithium acrylate is completely dissolved, add 2g of nonylphenol polyoxyethylene ether emulsifier, and disperse evenly to obtain System II. Mix system I and system II, fully emulsify under mechanical stirring, adjust pH value to about 8 with phosphate buffer solution, vacuumize, remove non-water-soluble solvent, add 4.5g methyl methacrylate and 4.5g acrylonitrile, stir Homogenously, System III is obtained. Introduce helium into system III, remove the air for 1 hour, add 0.15 g of ammonium persulfate dropwise to system III at 30°C, and react for 10 hours, vacuumize and degas, and adjust the solid conte...

Embodiment 3

[0095] Embodiment 3: the making of electrode and performance test

[0096] 1. Production of positive electrode

[0097] The cathode active material LiCoO 2 , conductive carbon powder, and sample 1# are added in N-methylpyrrolidone (NMP) according to the mass ratio=95:2:3 and mixed and stirred evenly to make positive electrode sheet slurry; the prepared positive electrode sheet slurry is evenly coated On both sides of the aluminum foil of the positive electrode current collector, after drying and compacting, the negative electrode sheet of the lithium ion battery is obtained, which is recorded as P1.

[0098] Replace sample 1# with sample 2#~sample 19#, and other conditions remain unchanged, and the obtained positive electrode sheets are respectively recorded as P2~P19.

[0099] 2. Production of negative electrode

[0100] With MAGE graphite (MAGE is a kind of commercial high-capacity, high-pressure dense artificial graphite; Specific capacity is 360mgAh / g), conductive carbo...

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Abstract

The invention relates to an aqueous binder. The aqueous binder is characterized in that the aqueous binder is emulsion contains emulsion particles of a core-shell structure, the core of each emulsion particle of the core-shell structure contains fluorine-containing polymer A and fluoride-free oleophylic polar polymer B, a shell of each emulsion particle of the core-shell structure contains hydrophilic polymer M, and the solid content of the emulsion particles of the core-shell structure in the emulsion is 5-50 wt%. An electrode slice prepared with the aqueous binder is applied to a lithium ion battery, the capacity of the lithium ion battery can be highly brought into play, the adhering performance of an interface between the electrode slice and an isolating membrane is good, and the cycle life of the cell is long; the isolating membrane treated with the aqueous binder is high in ionic conductivity and can be firmly adhere to the electrode slice.

Description

technical field [0001] The application relates to a water-based adhesive, its preparation method and application, and belongs to the field of lithium-ion battery materials. Background technique [0002] Due to a series of advantages such as high energy density, long cycle life, high open circuit voltage, safety and stability, lithium-ion batteries have developed rapidly in just over a decade, and are therefore widely used for notebook computers, digital cameras, video cameras, Various mobile devices and devices such as mobile communication equipment provide power. [0003] A lithium-ion battery consists of a positive electrode sheet, a separator, a negative electrode sheet, an electrolyte, and a battery case. Adhesives are mostly required in the preparation process of positive electrode sheets, separators, and negative electrode sheets of lithium-ion batteries to prepare active materials into slurry, followed by coating, drying and other processes. [0004] Adhesives for l...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M2/16H01M10/058H01M10/0525H01M50/403H01M50/489H01M50/497
CPCH01M4/622H01M4/623H01M10/0525H01M10/058H01M50/409Y02E60/10Y02P70/50
Inventor 张盛武平翔程文强
Owner CONTEMPORARY AMPEREX TECH CO
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