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A method for prepare a low moisture ceramic separator for lithium battery, an aqueous slurry, and a ceramic separator

A technology of ceramic diaphragm and water-based slurry, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems affecting the electrical performance and safety performance of lithium batteries, and ceramic drop points, etc., to achieve low water absorption performance and not easy to drop Powder, the effect of improving the bond strength

Active Publication Date: 2019-01-08
JIANGSU ANREDA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the basis of the existing matrix material system, coating ceramic coating is an important direction for the research and development of diaphragm materials at present, but ceramic diaphragms generally use nano-scale aluminum oxide particles with a specific surface area of ​​4-8m2 / g , very easy to absorb water; moreover, due to the compatibility of ceramic powder and binder, it is easy to cause ceramics to fall off, which seriously affects the electrical performance and safety performance of lithium batteries.

Method used

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  • A method for prepare a low moisture ceramic separator for lithium battery, an aqueous slurry, and a ceramic separator
  • A method for prepare a low moisture ceramic separator for lithium battery, an aqueous slurry, and a ceramic separator
  • A method for prepare a low moisture ceramic separator for lithium battery, an aqueous slurry, and a ceramic separator

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Experimental program
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Effect test

Embodiment 1

[0027] Bake 6kg of aluminum oxide powder at 80°C for 24 hours, then add it to 10kg of methyl methacrylate (MMA) monomer, add 30g of benzoyl peroxide (BPO), and impregnate it under normal temperature and pressure After 4 days, take it out and react at 80°C for 1 hour, and finally dry it in a vacuum oven at 40°C for 24 hours to make an organically modified ceramic powder. Stir the above-mentioned organically modified ceramic powder, deionized water, polymethyl methacrylate binder, sodium carboxymethyl cellulose, and sodium polyacrylate according to the ingredients of 30:60:5:0.5:0.5, and sand the The milling time is 1 hour, the rotation speed is 1000 RPM, and the aqueous slurry is obtained. The above water-based slurry was coated on one side of the 14um PP separator by micro-gravure roll coating, and baked at 65°C for 2 minutes to obtain a ceramic separator with a total thickness of 16um.

Embodiment 2

[0029] Bake 6kg of aluminum oxide powder at 80°C for 24h, then add it to 10kg of propyl acrylate monomer, add 30g of azobisisobutylcyanide (AIBN), impregnate it at normal temperature and pressure for 5 days, and then Take it out and react at 70°C for 1.5h, and finally dry it in a vacuum oven at 40°C for 24h to prepare an organically modified ceramic powder. Stir the above-mentioned organically modified ceramic powder, deionized water, polymethyl methacrylate binder, sodium carboxymethyl cellulose, and sodium polyacrylate according to the ingredients of 30:60:5.5:0.5:0.5, and sand the The milling time is 1.5 hours, the rotation speed is 800 RPM, and the aqueous slurry is obtained. The above water-based slurry was coated on one side of the 14um PP separator by micro-gravure roll coating, and baked at 70°C for 2 minutes to obtain a ceramic separator with a total thickness of 16um.

Embodiment 3

[0031] Bake 6kg of aluminum oxide powder at 80°C for 24 hours, then add it to 10kg of styrene monomer, add 40g of azobisisobutylcyanide (AIBN), impregnate it for 5 days at normal temperature and pressure, and then take it out And react at 80° C. for 1.5 hours, and finally dry in a vacuum oven at 40° C. for 24 hours to prepare an organically modified ceramic powder. The above-mentioned organically modified ceramic powder, deionized water, styrene-acrylic emulsion binder, sodium carboxymethyl cellulose, and ammonium polyacrylate are stirred according to the ingredients of 36:60:4.5:0.5:0.5, and the sanding time of the sand mill is 2 hours, rotating speed 600RPM, obtain water-based slurry. The above water-based slurry was coated on one side of the 14um PP separator by micro-gravure roll coating, and baked at 65°C for 2 minutes to obtain a ceramic separator with a total thickness of 16um.

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Abstract

The invention belongs to the technical field of preparation of a lithium battery separator, in particular to a preparation method of a low-moisture ceramic separator for lithium battery, an aqueous slurry and a low-moisture ceramic separator. The preparation method of the low-moisture ceramic separator for the lithium battery comprises the following steps: step S1, preparing an organic modified ceramic powder; 2, prepare an aqueous slurry from that organic modified ceramic powder; And step S3, coating an aqueous slurry on the surface of the lithium ion battery separator and baking to remove water to form a ceramic separator so as to reduce the water absorption of the ceramic separator.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragm preparation, in particular to a preparation method of a low-moisture ceramic diaphragm for a lithium battery, an aqueous slurry and a low-moisture ceramic diaphragm. Background technique [0002] Due to its high energy density, wide operating temperature range, long storage time for stable discharge, and long storage and cycle time, lithium-ion batteries are currently widely used in many electronic technology fields such as computers, automobiles, and mobile phones. The composition of lithium-ion batteries mainly includes four key materials, positive and negative electrode materials, electrolyte and diaphragm. [0003] At present, polyolefin materials such as polypropylene (PP), polyethylene (PE) are the main matrix materials for lithium-ion battery separators, but regardless of polypropylene (PP), polyethylene (PE) or other thermoplastic polymer materials, when they are close to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434H01M50/449
CPCH01M10/0525H01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 李正林唐皞王成豪严伟瞿红艳景小云
Owner JIANGSU ANREDA NEW MATERIAL
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