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Water-based ceramic coating for lithium ion battery and application thereof

A lithium-ion battery and ceramic coating technology, which is applied in the direction of battery electrodes, battery pack components, non-aqueous electrolyte battery electrodes, etc., can solve the problem of poor interface adhesion of polyolefin substrates, inability to infiltrate polypropylene diaphragms, and battery retention fluids. Poor performance and other problems, to achieve good air permeability, strong ability to absorb and retain electrolyte, and good adhesion

Inactive Publication Date: 2013-05-15
DONGGUAN YIWEIKE ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are mainly two types of coatings. One is oily slurry coating with PVDF as the adhesive. This kind of coating needs to use toxic organic solvents such as acetone, and because the oily slurry has a certain effect on the polyolefin release film. Penetration effect, easy to block the micropores of the substrate, affecting battery performance
One type is a water-based slurry coating that uses a water-soluble polymer as an adhesive. This water-soluble polymer has poor interface adhesion to polyolefin substrates and cannot infiltrate the polypropylene diaphragm. In addition, it is a solvent The degree parameter is greater than 25 (J / cm 3 ) 1 / 2 The polymer has poor infiltration of the electrolyte and cannot swell, resulting in poor liquid retention performance of the battery, affecting battery cycle, rate and other performance

Method used

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  • Water-based ceramic coating for lithium ion battery and application thereof
  • Water-based ceramic coating for lithium ion battery and application thereof
  • Water-based ceramic coating for lithium ion battery and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] A water-based ceramic coating for lithium-ion batteries; comprising 20% ​​of the composition calculated by weight percentage and 80% of water; wherein, the composition includes a water-soluble polymer thickener (selected carboxyethyl fiber) element) 0.1%, water-based dispersant (polyethylene glycol) 0.1%, D50 is 0.2um, BET is 15m 2 / g ceramic (select silicon dioxide) particles 99.7% and water-based latex (select δ≈19.2(J / cm 3 ) 1 / 2 Polymethyl methacrylate) 0.1%;

[0061] Wherein, the swelling rate of the dry glue of described carboxyethyl cellulose in carbonate solvent is less than 5%, and the dry material of polymethyl methacrylate must have a solubility parameter of 17 (J / cm 3 ) 1 / 2 The swelling degree of the polymethyl methacrylate dry material in the carbonate solvent is 100%, and the Young's modulus of the swollen dry glue is greater than 200 MPa.

[0062] The method for preparing described water-based ceramic paint; comprises following preparation steps:

[0...

Embodiment 2

[0070] A water-based ceramic coating for lithium-ion batteries; comprising 70% of the composition calculated by weight percentage and 30% of water; wherein, the composition includes a water-soluble polymer thickener (selected carboxymethyl fiber) Sodium (CMC-Na)) 5%, water-based dispersant (polyacrylic acid) 5%, D50 is 5um, BET is 1m 2 / g ceramic (zirconium dioxide) particles 80% and water-based latex (polyvinyl acetate) 10%;

[0071] Wherein, the swelling ratio of the dry glue of the sodium carboxymethylcellulose in the carbonate solvent is less than 5%, and the dry material of the polyvinyl acetate must have a solubility parameter of 25 (J / cm 3 ) 1 / 2 , the swelling degree of the dry material of the polyvinyl acetate in the carbonate solvent is 1000%, and the Young's modulus of the dry glue after swelling is greater than 200MPa; The polyvinyl acetate is δ≈18.8 (J / cm 3 ) 1 / 2 of polyvinyl acetate.

[0072] The method for preparing the water-based ceramic coating is the same...

Embodiment 3

[0079] A water-based ceramic coating for a lithium-ion battery; comprising 50% of the composition and 50% of water by weight percentage; wherein, the composition includes a water-soluble polymer thickener (preferably polyacrylamide ( PAM)) 0.2%, aqueous dispersant (preferably sodium polyacrylate) 0.2%, D50 is 3.4um, BET is 10m 2 / g ceramic (preferably zirconium dioxide) particles 97.6% and water-based latex (preferably polybutylmethacrylate) 2%;

[0080] Wherein, the swelling rate of the polyacrylamide (PAM) dry glue in the carbonate solvent is less than 5%, and the polybutyl methacrylate dry material must have a solubility parameter of 20 (J / cm 3 ) 1 / 2 The swelling degree of the dry material of the polybutyl methacrylate in the carbonate solvent is 500%, and the Young's modulus of the dry glue after swelling is greater than 200MPa, and the polybutyl methacrylate is δ≈17.4 (J / cm 3 ) 1 / 2 of polybutylmethacrylate.

[0081] The method for preparing the water-based ceramic c...

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Abstract

The invention relates to the technical field of lithium ion battery, in particular relates to a water-based ceramic coating for the lithium ion battery and an application thereof in positive and negative electrodes and separators. The water-based ceramic coating disclosed by the invention comprises the following components in percentage by weight: 0.1-5% of water-soluble polymeric thickener, 0.1-5% of aqueous dispersant, 80-99.7% of ceramic particles, and 0.1-10% of aqueous latex. The water-based ceramic coating disclosed by the invention is stable in system, viscosity and granularity, and is difficult to precipitate; in addition, the polypropylene substrate, polyethylene substrate and the positive and negative electrodes can be soaked, surface treatment such as corona disposal and the like is not necessary, and the adhesion of the coating onto the polypropylene substrate, polyethylene substrate and the interface of the positive and negative electrodes are strong.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a water-based ceramic coating for lithium ion batteries and its application on positive and negative electrodes and diaphragms. Background technique [0002] Lithium-ion batteries are widely used as power sources for various mobile devices due to their high energy density, high operating voltage, wide application temperature range, and long cycle life. Problems, especially when the lithium-ion battery is abused or the protection circuit fails, safety accidents such as fire or explosion are prone to occur. [0003] Among them, the lithium-ion battery separator is an indispensable part of the battery composition because it has the functions of isolating the positive and negative electrodes, electronic insulation, providing a channel for lithium ions to shuttle between the positive and negative electrodes, absorbing and maintaining the electrolyte, and ensuring the bat...

Claims

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Application Information

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IPC IPC(8): C09D1/00H01M2/16H01M4/13H01M4/139
CPCY02E60/122Y02E60/10
Inventor 王学泽
Owner DONGGUAN YIWEIKE ELECTRONICS TECH CO LTD
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