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Water-based positive pole slurry of lithium ion battery and preparation method thereof

A lithium-ion battery, cathode slurry technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of difficult to meet the requirements of commercial applications, unsatisfactory results, etc., to improve stability and processing performance, Stable electrochemical performance, environmentally friendly effect

Inactive Publication Date: 2011-07-20
DONGGUAN AMPEREX TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, the industry began to try to use water-based systems to prepare positive electrode slurry, but the results were not ideal, and it was difficult to meet the requirements of commercial applications.

Method used

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  • Water-based positive pole slurry of lithium ion battery and preparation method thereof
  • Water-based positive pole slurry of lithium ion battery and preparation method thereof
  • Water-based positive pole slurry of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 200kg of deionized water into the container, then slowly add 4Kg of dispersant (polyoxyethylene ether block copolymer with a number average molecular weight of 3000), 1.2KG of antifoaming agent polysiloxane (product model is A10), 5Kg sodium carboxymethyl cellulose thickener, 5kg polyacrylamide thickener, 9Kg conductive carbon (Super “p” Li), 300Kg active material lithium cobaltate, and 10Kg adhesive The styrene-butadiene latex is finally prepared into a water-based cathode slurry with a solid content of 60% to 70% and a viscosity of 3000 to 8000mpas.

Embodiment 2

[0030] Weigh 200kg deionized water and 20Kg isopropanol into the container, then slowly add 5Kg polyoxyethylene ether block copolymer dispersant, 1Kg wetting agent polyoxyethylene alkylphenol ether (the number average molecular weight is 6000 , such as product model PE100), 1Kg antifoaming agent polysiloxane (product model is 8034), 5Kg carboxymethylcellulose sodium thickener, after the dispersion is even, add 12Kg conductive carbon (Super “p” Li), 300Kg of active material lithium manganate, and then adding 12Kg of binder polyvinyl alcohol, finally prepared into a water-based cathode slurry with a solid content of 60% to 70% and a viscosity of 3000 to 6000mpas.

Embodiment 3

[0032] Weigh 60kg of deionized water and 40Kg of isopropanol into the container, then slowly add 8Kg of polyoxyethylene ether block copolymer dispersant (such as product model AFX1080), add 2Kg of silicone oil and vinyl ester with a ratio of 1:1 The leveling agent of the mixture, 2Kg defoamer polysiloxane (commodity model is 8034A), 10Kg carboxymethyl cellulose sodium thickener, 2kg polyacrylamide thickener, disperse evenly and then add 15Kg conductive carbon ( Super “p” Li), 200Kg active material lithium iron phosphate, then add 8Kg adhesive polyacrylate, then add 0.3Kg pH regulator 2-amino-2-methyl-1-propanol (such as product model Conspirit 950), and finally prepared into a water-based cathode slurry with a solid content of 65% to 75% and a viscosity of 3000 to 6000mpas.

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Abstract

The invention relates to the field of preparation of slurry of a lithium ion battery and discloses water-based positive pole slurry of the lithium ion battery. The slurry is prepared from 40-80 parts by weight of active substance, 25-50 parts by weight of solvent, 1-5 parts by weight of surfactant, 1-3 parts by weight of thickener, 2-6 parts by weight of conducive agent and 2-4 parts by weight of binding agent, wherein the solvent is one or two of deionized water and isopropanol, the surfactant is an anionic surfactant, the thickener is one or two of sodium carboxymethyl cellulose and polyacrylamide, and the binding agent is one or more of styrene-butadiene rubber latex, polyvinyl alcohol and polyacrylate. Compared with the prior art, the water-based positive pole slurry does not use the organic solvent which can pollute the environment and is difficult to recycle any more, thereby being environment-friendly; and furthermore, the boiling point of a water-based system is lower, the preparation process can save more energy, the cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a positive electrode slurry of a lithium ion battery, in particular to a water-based positive electrode slurry beneficial to environmental protection and a preparation method thereof. Background technique [0002] In the preparation process of lithium-ion batteries, the active material needs to be prepared into a uniformly dispersed slurry, and then coated on the current collector. For positive electrode materials, one or more of organic solvents such as N-methylpyrrolidone, dimethylformamide, cyclohexanone, diethylformamide, and dimethyl sulfoxide are usually used to make slurry. These solvents are mainly due to their ability to dissolve the binder PVDF. However, the above-mentioned solvents have a high boiling point, require more heat energy in the evaporation and drying process, and will cause serious pollution to the environment after volatilization into the air. If it is recycled, it needs to consume a lot of energy, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 梅铭赖旭伦许瑞赵丰刚柳娜
Owner DONGGUAN AMPEREX TECH
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