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Yellow ceramic diaphragm for lithium ion battery and application thereof

A technology for lithium ion batteries and separators, which is applied in the application field of yellow water-based ceramic slurry for lithium ion batteries on separators, can solve the problems of difficulty in identifying the coated surface and non-coated surface, easy to cause misjudgment, etc. Liquid, maintain adhesive properties, high efficiency

Inactive Publication Date: 2014-03-12
DONGGUAN YIWEIKE ELECTRONICS TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, it is difficult to identify the coated surface and the non-coated surface after the conventional pure alumina ceramic slurry is coated on one side, and it is easy to cause misjudgment during the production process.

Method used

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  • Yellow ceramic diaphragm for lithium ion battery and application thereof
  • Yellow ceramic diaphragm for lithium ion battery and application thereof
  • Yellow ceramic diaphragm for lithium ion battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A yellow ceramic slurry and diaphragm for lithium-ion batteries; including 30% of the composition calculated by weight percentage and 70% of water; wherein, the composition includes a water-soluble polymer thickener (selected carboxylated Ethyl cellulose) 0.1%, water-based dispersant (polyethylene glycol) 0.1%, D50 is 0.2um, BET is 15m 2 / g ceramic (select silicon dioxide) particles 98.7%, yellow zirconium silicate 1% and water-based latex (select δ≈19.2(J / cm 3 ) 1 / 2 Polymethyl methacrylate) 0.1%;

[0054] 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.

[0055] The method for preparing the yellow water-based ceramic slurry; compri...

Embodiment 2

[0062] A water-based ceramic slurry for a lithium ion battery; comprising 50% of the composition calculated by weight percentage and 50% of water; wherein, the composition includes a water-soluble polymer thickener (preferably polyacrylamide) calculated by weight percentage (PAM)) 0.2%, water-based 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%;

[0063] 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.

[0064] The ...

Embodiment 3

[0069] A water-based ceramic slurry for a lithium ion battery; comprising 30% of the composition calculated by weight percentage and 70% of water; wherein, the composition includes a water-soluble polymer thickener (preferably polyvinyl alcohol) calculated by weight percentage (PVA)) 2%, aqueous dispersant (composed of 1% polyethylene glycol and 1% sodium polyacrylate) 2%, D50 is 1.8um, BET is 5m 2 / g ceramic (preferably titanium dioxide) particles 89% and water-based latex (1% polyethylacrylate) 5%;

[0070] Wherein, the swelling ratio of the dry glue of described polyvinyl alcohol in carbonate solvent is less than 5%, and the dry material of polyacrylate must have a solubility parameter of 19 (J / cm 3 ) 1 / 2 The swelling degree of the dry material of the polyethyl acrylate in the carbonate solvent is 300%, and the Young's modulus of the dry glue after swelling is greater than 200MPa, and the polyethyl acrylate is δ≈18.4 (J / cm 3 ) 1 / 2 of polyethyl acrylate.

[0071] The met...

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Abstract

The invention relates to the technical field of lithium ion batteries and especially to an aqueous yellow ceramic slurry for a lithium ion battery and application thereof. The aqueous yellow ceramic slurry comprises, by weight, 0.1 to 2% of a water-soluble polymer thickening agent, 0.1 to 2% of an aqueous disperser, 80 to 99.7% of a ceramic particle, 1 to 2% of yellow zirconium silicate and 0.1 to 5% of aqueous latex. The aqueous yellow ceramic slurry provided by the invention has the advantages of a stable system, stable viscosity, stable granularity, uneasy deposition, capacity of infiltrating PP and PE substrates, no need for surface treatment like corona treatment, high adhesion on the PP and PE substrates and high cost performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to the application of a yellow water-based ceramic slurry for lithium ion batteries on a diaphragm. 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 battery cycle life. important com...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525H01M50/434
CPCY02E60/122H01M50/431Y02E60/10
Inventor 王学泽
Owner DONGGUAN YIWEIKE ELECTRONICS TECH CO LTD
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