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Inorganic ceramic coated functional lithium ion battery diaphragm, preparation method and lithium ion battery thereof

A lithium-ion battery, inorganic ceramic technology, applied in secondary batteries, battery pack parts, secondary battery repair/maintenance, etc., can solve the problem of difficult to control batch consistency of coating thickness, coating equipment and cutting blade wear , The problem of high hardness of alumina material, which is beneficial to the weight energy density, improves heat resistance, and improves heat resistance.

Inactive Publication Date: 2018-12-07
深圳市旭然电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high hardness of alumina material causes serious wear and tear on mixing equipment, coating equipment and slitting blades, which makes it difficult to control the batch consistency of its coating thickness and high cost, making it difficult to carry out large-scale production
Moreover, with the development and application of high-energy-density lithium-ion batteries, thinner and lighter coatings have become the future application direction. Due to the characteristics of alumina itself, it is difficult to make technological breakthroughs in these areas

Method used

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  • Inorganic ceramic coated functional lithium ion battery diaphragm, preparation method and lithium ion battery thereof

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Embodiment 1

[0041] Preparation of Inorganic Ceramic Coated Functional Lithium-ion Battery Separator Membrane

[0042] The coating slurry formula is based on the weight percentage of the dry material. The coating slurry consists of 3 wt% styrene / acrylate copolymer emulsion, 3wt% lithium polyacrylate, 1 wt% sodium carboxymethyl cellulose, 93 wt% platy boron Mushi particles are composed of four parts. Among them, the average particle size D50 of the platy boehmite particles is 0.6um, D10 is 0.2um, D90 is 2.6um, D99 is 3.7um, and the thickness is 0.3um. Styrene / acrylate copolymer emulsion is selected as the water-emulsion polymer binder, and the contact angle of the water droplet of the dry glue is 125° o . Lithium polyacrylate is selected as the water-soluble polymer binder, and its melting temperature is about 180 o c. During the preparation of the slurry, the solvent is deionized water, wherein the weight of the solid part accounts for about 40 wt% of the total weight of the slurry.

...

Embodiment 2

[0062] The coating slurry formula is based on the weight percentage of the dry material. The coating slurry consists of 10 wt% styrene / acrylate copolymer emulsion, 0.5 wt% lithium polyacrylate, 2 wt% sodium carboxymethyl cellulose, 87.5 wt% platy Boehmite particles consist of four parts. Among them, the average particle size D50 of the platy boehmite particles is 0.6um, D10 is 0.2um, D90 is 2.6um, D99 is 3.7um, and the thickness is 0.3um. Styrene / acrylate copolymer emulsion is selected as the water-emulsion polymer binder, and the contact angle of the water droplet of the dry glue is 125° o . Lithium polyacrylate is selected as the water-soluble polymer binder, and its melting temperature is about 180 o c. During the preparation of the slurry, the solvent is deionized water, wherein the weight of the solid part accounts for about 40 wt% of the total weight of the slurry.

[0063] Using a reverse roll micro-gravure coater, the coating slurry prepared as above is coated on o...

Embodiment 3

[0066]The coating slurry formulation is based on the weight percentage of the dry material. The coating slurry consists of 2 wt% styrene / acrylate copolymer emulsion, 2wt% lithium polyacrylate, 1 wt% sodium carboxymethyl cellulose, 95 wt% platy boron Mushi particles are composed of four parts. Among them, the average particle size D50 of the platy boehmite particles is 0.6um, D10 is 0.2um, D90 is 2.6um, D99 is 3.7um, and the thickness is 0.3um. Styrene / acrylate copolymer emulsion is selected as the water-emulsion polymer binder, and the contact angle of the water droplet of the dry glue is 125° o . Lithium polyacrylate is selected as the water-soluble polymer binder, and its melting temperature is about 180 o c. During the preparation of the slurry, the solvent is deionized water, wherein the weight of the solid part accounts for about 40 wt% of the total weight of the slurry.

[0067] Using a reverse roll micro-gravure coater, the coating slurry prepared as above is coated...

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Abstract

An inorganic ceramic coated functional lithium ion battery diaphragm, a preparation method and a lithium ion battery thereof are disclosed. The diaphragm comprises a porous substrate and an inorganicceramic functional coating attached to at least one surface of the porous substrate. The inorganic ceramic coating comprises (by weight): 80-99.4% of plate-shaped boehmite particles, 0.2-3.0% of a water-soluble polymer thickener, 0.2-15.0% of a water-emulsion polymer binder and 0.2-15.0% of a water-soluble polymer binder. By the use of the coating product, thickness of the inorganic functional layer can be effectively reduced, uniformity of the thickness is guaranteed, and excellent high temperature resistance of the coated diaphragm is ensured. As the plate-shaped boehmite particles have thecharacteristic of low hardness, mechanical wear of the coating material is also reduced.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries, more specifically, the present invention relates to an inorganic ceramic coated functionalized lithium ion battery separator and a preparation method thereof, and a lithium ion battery separator containing the inorganic ceramic coated functionalized lithium ion battery separator Lithium Ion Battery. Background technique [0002] Since the promotion of commercialization, lithium-ion batteries have been widely used in various portable batteries due to their advantages such as high energy density, high working voltage, long cycle life, no memory effect, green environmental protection, and flexible design of size and shape according to actual needs. Power supplies for consumer electronics. In addition, with the country's demand for environmental improvement and mobile energy storage devices, lithium-ion batteries are widely used in the development of power batteries and energy ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 郑君周鑫
Owner 深圳市旭然电子有限公司
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