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In-situ composite ceramic diaphragm with core-shell structure and preparation method and application thereof

A technology of core-shell structure and ceramic diaphragm, applied in structural parts, nanotechnology for materials and surface science, repair/maintenance of secondary batteries, etc., can solve the problems of light and thin batteries, high energy density, harshness, instability, etc. , to achieve good thermal closed cell performance, improve safety, and high mechanical strength

Active Publication Date: 2022-07-12
安徽美芯新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the instability and abuse of lithium-ion batteries themselves and the more stringent technical requirements for thinner batteries and higher energy density due to technological development, frequent safety accidents have attracted more and more attention.

Method used

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  • In-situ composite ceramic diaphragm with core-shell structure and preparation method and application thereof
  • In-situ composite ceramic diaphragm with core-shell structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The in-situ composite ceramic separator with the core-shell structure was prepared by the following steps:

[0028](1) Take 30g of nano-ceramic particles with a particle size of 30-100nm, 2g of γ-aminopropyltriethoxysilane, 8g of isopropyl tris(dioctyl pyrophosphate acyloxy) titanate, and 20g of ethyl acrylate , 40g of styrene, 40g of methyl methacrylate, and 1g of azobisisobutyronitrile are proportioned, using γ-aminopropyltriethoxysilane and isopropyltris (dioctyl pyrophosphate acyloxy) After the nano-ceramic particles are modified by titanate, they are dispersed in a coating agent prepared by ethyl acrylate, styrene and methyl methacrylate, and azobisisobutyronitrile is added for in-situ polymerization to prepare and screen out a particle size of 100. -350nm core-shell structure nano-ceramic particles;

[0029] (2) 50g of nano-ceramic particles with core-shell structure, 100g of diisononyl phthalate, 100g of dioctyl azelaic acid, 10g of low density polyethylene (vis...

Embodiment 2

[0033] Take 40g of nano-ceramic particles with a particle size of 30-100nm, 4g of γ-(methacryloyloxy)propyltrimethoxysilane, 8g of isopropyl tris(dioctylpyrophosphate acyloxy)titanate, ethyl acrylate Ester 5g, butyl acrylate 5g, vinyl acetate 2g, acrylamide 2g, acrylic resin 4g, azobisisobutyronitrile 1.2g for proportioning, using γ-(methacryloyloxy)propyltrimethoxysilane A coating agent prepared by dispersing in ethyl acrylate, butyl acrylate, vinyl acetate, acrylamide and acrylic resin after modifying nano-ceramic particles with isopropyl tris(dioctyl pyrophosphate acyloxy) titanate , adding azobisisobutyronitrile in-situ polymerization to prepare and screen out the core-shell structure nano-ceramic particles with a particle size of 100-350nm;

[0034] (2) 40g of nano-ceramic particles with core-shell structure, 100g of di-n-octyl phthalate, 100g of dioctyl azelaate, 100g of (2-ethylhexyl) phthalate, low-density polyethylene ( Viscosity-average molecular weight 100,000) 10 ...

Embodiment 3

[0038] The in-situ composite ceramic separator with the core-shell structure was prepared by the following steps:

[0039] (1) Take 30 g of nano-ceramic particles with a particle size of 30-100 nm, 3 g of γ-glycidyl ether oxypropyltrimethoxysilane, 4 g of isopropyl tris(dioctyl pyrophosphate acyloxy) titanate, bis( Dioctyloxy pyrophosphate group) ethylene titanate 3g, butyl acrylate 20g, styrene 50g, vinyl acetate 30g, azobisisoheptanenitrile 1g, azobisisobutyronitrile 1g for proportioning, Nano-ceramic particles were modified by γ-glycidyl ether oxypropyl trimethoxy silane, isopropyl tris(dioctyl pyrophosphate acyloxy) titanate, dispersed in butyl acrylate, styrene, vinyl acetate In the coating agent prepared by the ester, azobisisoheptanenitrile and azobisisobutyronitrile are added for in-situ polymerization to prepare and screen out the core-shell structure nano-ceramic particles with a particle size of 100-350nm;

[0040] (2) 50g of nano-ceramic particles with core-shell ...

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Abstract

The invention relates to an in-situ composite ceramic diaphragm with a core-shell structure and a preparation method and application thereof. The core-shell structure nano-ceramic particles are prepared by modifying the small-sized nano-ceramic particles, dispersed in the soft monomer and hard monomer, and in situ polymerization initiated by an initiator; the core-shell structure nano-ceramic particles are dispersed in plasticized After forming a homogeneous dispersion system in the plasticizers and processing aids, the secondary in-situ reaction is carried out with the molten polyolefin resin to form a thick sheet. After the plasticizer is extracted, two-way pulling is carried out, so that the film can be formed in the core-shell structure nano-ceramic. In the structural state with uniform particle distribution, it has a uniform open pore structure, which can reduce the ion diffusion resistance and further improve the safety of the battery; and the film is formed at a high temperature of 135-150 ℃. The combined state of the olefin resin avoids the disadvantage of nano-ceramic particles falling off, the overall mechanical strength of the ceramic diaphragm is high, and it has good thermal closed cell performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an in-situ composite ceramic separator with a core-shell structure and a preparation method and application thereof. Background technique [0002] Secondary lithium-ion batteries are widely used in 3C products, electric vehicles and energy storage due to their high energy density, long service life, low self-discharge rate, and no memory effect. Especially with the increasingly prominent energy crisis and environmental protection issues in recent years, the use of lithium-ion batteries in the field of electric vehicles is increasing almost linearly. However, due to the instability and abuse of lithium-ion batteries and the more stringent technical requirements for thin batteries and high energy density due to technological development, frequent safety accidents have attracted more and more attention. The quality of the separator determines the interface structure a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/443H01M50/434H01M50/414H01M50/446H01M10/0525H01M10/42B82Y30/00H01M50/417
CPCH01M10/0525H01M10/4235B82Y30/00H01M50/446H01M50/403Y02E60/10
Inventor 徐井水黄伟汕张朝益
Owner 安徽美芯新材料有限公司
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