Phenolic resin modified ceramic diaphragm and application thereof

A technology of phenolic resin and ceramic diaphragm, applied in the field of electrochemistry, can solve the problems of positive and negative contact short circuit, application that cannot meet the high safety of the battery, and degradation of the mechanical properties of the diaphragm.

Inactive Publication Date: 2018-09-04
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, with the melting of the base film, the mechanical properties of the separator are also greatly reduced. Since the ceramic layer cannot form a self-supporting film, the separator will event

Method used

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  • Phenolic resin modified ceramic diaphragm and application thereof
  • Phenolic resin modified ceramic diaphragm and application thereof
  • Phenolic resin modified ceramic diaphragm and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Prepare the ceramic diaphragm:

[0055] 95 parts by mass of aluminum oxide inorganic powder with a particle diameter of about 300nm, 3 parts by mass of styrene-butadiene rubber, 2 parts by mass of sodium carboxymethyl cellulose, and the second solvent is a water / ethanol mixture with a volume ratio of 1:1 , prepared into a ceramic slurry with a solid content of 10%, coated on the surface of a single-layer commercial polyethylene (PE) diaphragm, and dried to remove the second solvent to obtain an aluminum oxide ceramic diaphragm.

[0056] Preparation of phenolic resin modified ceramic diaphragm:

[0057] In terms of weight percentage, the preparation contains 5% formaldehyde, 8% phenol, 1% sodium hydroxide, 0.5% barium hydroxide, 1.2% resorcinol, 0.13% sodium petroleum sulfonate, and 0.15% sodium cetyl sulfonate. % of the first solution of water / ethanol volume ratio 2:1. Soak the above aluminum oxide ceramic diaphragm in the mixed solution and react with 75°C for 1h, th...

Embodiment 2

[0059] Synthetic phenolic resin:

[0060] In terms of mass percentage, react a mixed solution containing 15% of acetaldehyde, 10% of phenol, 3% of hydrochloric acid, and 72% of solvent (volume ratio of water and isopropanol 1:2) at 65°C for 1.5h, and then at 95°C React for 5 hours, separate, wash and dry to obtain phenolic resin.

[0061] Preparation of phenolic resin modified ceramic diaphragm:

[0062]5 parts by mass of the phenolic resin synthesized above, 2 parts by mass of gelatin, 2 parts by mass of polyvinyl alcohol, 1 part by mass of hexamethyltetramine, 0.1 part by mass of toluenesulfonic acid, 0.1 part by mass of sodium dodecylbenzenesulfonate, 89.8 parts by mass of silicon dioxide with a particle diameter of about 200nm and water and isopropanol are formulated into a phenolic resin ceramic slurry with a solid content of 15% in a volume ratio of 1:1.5, and the above-mentioned phenolic resin ceramic slurry is coated on a single-layer surface of a commercial polyethy...

Embodiment 3

[0064] Prepare the ceramic diaphragm:

[0065] 90 parts by mass of magnesium oxide inorganic powder with a particle diameter of about 500nm, 5 parts by mass of styrene-butadiene rubber, 5 parts by mass of sodium carboxymethylcellulose, and the second solvent is a water / acetone mixture with a volume ratio of 2:1, and prepare A ceramic slurry with a solid content of 12% is coated on the double-layer surface of a commercially available polypropylene (PP) diaphragm, and dried to remove the second solvent to obtain a magnesium oxide ceramic diaphragm.

[0066] Preparation of phenolic resin modified ceramic diaphragm:

[0067] In terms of weight percentage, the preparation contains 6% furfural, 5% xylenol, 1% barium hydroxide, 0.5% calcium hydroxide, 1% resorcinol, 0.1% sodium petroleum sulfonate, cetyl sulfonic acid Sodium 0.1% Water / acetone 2:1 by volume as the second solvent. Soak the above-mentioned magnesium oxide ceramic diaphragm in the mixed solution and react with 65°C fo...

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Abstract

The invention discloses a phenolic resin modified ceramic diaphragm and application thereof. The diaphragm comprises porous base film, at least one side of the film is provided with a phenolic resin ceramic layer by spreading a phenolic resin ceramic slurry; at least one surface of the porous base film is coated with the ceramic layer, and the surface of the ceramic layer, the insides of pores, the insides of the pores of the porous base film and the surface which is not coated with the ceramic layer are immersed in a phenolic resin precursor solution to be subjected to the in-situ polymerization to form the phenolic resin layer. Through the mixing coating of the phenolic resin and the ceramic slurry or the in-situ polymerizing of the phenolic resin on the basis of the ceramic diaphragm, aphenolic resin ceramic mixed layer can be formed on the surface of the porous base film, the surface of the porous base film and the insides of the pores are coated with the in-situ coating phenolicresin layer, thereby improving the thermal stability of the diaphragm, the diaphragm does not shrink at 200 DEG C and still maintains strong mechanical strength, the contact of the positive and negative electrodes is effectively blocked, and the safety performance of a battery is ensured.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a phenolic resin modified ceramic separator and an application thereof. Background technique [0002] As a chemical power system with high energy density, high output voltage, no memory effect, excellent cycle performance, and environmental friendliness, lithium-ion battery has good economic benefits, social benefits and strategic significance, and has been widely used in mobile communications, Digital products and other fields, and it is very likely to become the most important power supply system in the field of energy storage and electric vehicles. [0003] In lithium-ion batteries, the separator mainly plays the role of preventing positive and negative electrodes from contacting and allowing ion conduction, and is an important part of the battery. Currently, commercial lithium-ion batteries mainly use polyolefin diaphragm materials with microporous struc...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/411
CPCH01M50/411Y02E60/10
Inventor 赵金保彭龙庆张鹏
Owner XIAMEN UNIV
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