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High-safety diaphragm and battery

A high-safety diaphragm technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as high closed-cell temperature, adhesive functional coating does not have self-closing function, etc., to reduce closed-cell Pore ​​temperature, enhanced battery safety, and increased membrane rupture temperature

Pending Publication Date: 2021-06-29
ZHUHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used adhesive functional coating materials are fluorine-containing resins or acrylic resins, and the adhesive functional coatings prepared by the two do not have the function of self-closing cells, or the closing temperature is relatively high

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0027] The preparation method of the above-mentioned high-safety diaphragm includes:

[0028] S1, respectively dissolving and dispersing the heat-resistant resin and the inorganic particles in an organic solvent and mixing them to prepare a heat-resistant coating slurry;

[0029] S2. Coating the heat-resistant coating slurry on at least one surface of the porous substrate, removing the solvent by thermal or non-solvent-induced film formation, and drying to obtain a heat-resistant coating film;

[0030] S3, dispersing the adhesive resin with low melting point / viscosity temperature, inorganic particles and adhesive resin in water to form an aqueous coating slurry;

[0031] S4, coating the water-based coating slurry on at least one surface of the heat-resistant coating film, and drying to obtain the following: figure 1 High Security Coated Diaphragms shown.

[0032] The above-mentioned coating method is not limited, and various known methods such as wire rod, gravure roll, and ro...

Embodiment 1

[0036] Weigh 0.4Kg of modified para-aramid and dissolve it into 6kg of DMAC containing 4% calcium chloride co-solvent, then grind and disperse 0.6kg of alumina into 4kg of DMAC, and disperse the aramid solution and alumina The aramid fiber coating slurry is obtained by mixing liquid and liquid; the aramid fiber slurry is coated on one side of a 10um polyethylene-based film by extrusion coating, and after passing through a humidified oven, it is washed and dried to obtain the thickness of the aramid fiber coating film It is 13um, and the thickness of the aramid coating is 3um.

[0037] Weigh 0.7kg of modified polyethylene wax, 0.2kg of large particle size PMMA, and 0.2kg of polyacrylic acid emulsion adhesive and stir evenly in 10kg of water to prepare the adhesive layer coating slurry, which is applied by roller coating. Coated on both sides of the aramid fiber coating film, after drying, the thickness of the diaphragm is 16um, and the thickness of the double-sided adhesive coa...

Embodiment 2

[0039] Weigh 0.7Kg of meta-aramid and dissolve it into 6kg of NMP, then grind and disperse 0.3kg of alumina into 4kg of NMP, mix the aramid solution and alumina dispersion to prepare aramid coating slurry Material: Aramid slurry is coated on both sides of a 10um polyethylene-based film by micro-gravure roller coating. After washing and drying, the thickness of the aramid coating film is 14um, and the thickness of the aramid coating is 4um.

[0040] Weigh 0.6kg of modified polybutene, 0.15kg of PVDF powder, and 0.15kg of polyacrylate emulsion adhesive in 10kg of water and stir evenly to prepare the adhesive layer coating slurry, which is applied by roller coating Coated on one side of the aramid fiber coating film, after drying, the thickness of the diaphragm is 16um, and the thickness of the double-sided adhesive coating is 2um.

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Abstract

The invention relates to the field of battery diaphragms, in particular to a high-safety diaphragm and a battery, the high-safety diaphragm comprises a porous base material, a heat-resistant coating coated on at least one side of the porous base material, and a low-hole-closing-temperature coating coated on the porous base material or the heat-resistant coating; the heat-resistant coating comprises heat-resistant resin; the low-hole-closing-temperature coating comprises a self-hole-closing material; and the self-closing material comprises cohesive self-closing resin with a low melting temperature or a low viscous flow temperature. The diaphragm rupture temperature and the heat-resistant shrinkage performance of the diaphragm are improved by arranging the heat-resistant coating, meanwhile, the low-pore-closing-temperature coating is introduced, and cohesive self-closing resin with low melting temperature or low viscous flow temperature can be rapidly melted or softened at a certain temperature to close pores of the porous base membrane, so that the purpose of reducing the pore closing temperature is achieved, the difference value between the hole closing temperature and the membrane breaking temperature is increased, and the high-safety diaphragm is obtained, so that the safety of the battery is enhanced.

Description

technical field [0001] The invention relates to the field of battery separators, in particular to a high-safety separator and a battery. Background technique [0002] Lithium-ion batteries are usually mainly composed of positive electrodes, negative electrodes, separators, electrolytes, and battery casings. In the lithium-ion battery structure, the separator is one of the key inner components. The closed cell temperature and rupture temperature of the diaphragm are the main parameters to measure its safety performance. When the internal temperature of the cell reaches the closed cell temperature of the diaphragm, the micropores of the diaphragm will self-close, blocking the continued transmission of lithium ions, forming an open circuit, and then protecting the cell. When the internal temperature of the cell continues to rise compared with the closed cell temperature and reaches the membrane rupture temperature of the diaphragm, the diaphragm melt ruptures, causing an inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/491H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 庄志廖晨博陈永乐刘倩倩程跃
Owner ZHUHAI ENERGY NEW MATERIALS TECH CO LTD
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