High-temperature-resistant polymer modified ceramic diaphragm and application thereof

A high-temperature-resistant polymer and ceramic diaphragm technology, applied in the field of electrochemistry, can solve the problems of poor affinity polyolefin film, reduced mechanical properties of the diaphragm, and inability to quickly absorb electrolyte, etc.

Active Publication Date: 2018-10-16
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 is eventually pulverized, and the positive and negative contacts are short-circuited.
Obviously, this cannot meet the needs of applications requiring high security
[0007] In addition, the separator materials currently used by major battery manufacturers are mainly porous polymer films of polyolefins, which have poor affinity for electrolytes.
The affinity between the coated surface and the electrolyte can be improved by ceramic coating, and the adsorption and retention capacity of the separator to the electrolyte can be improved, but the lyophilicity of the separator base film to the electrolyte has not been improved.
Poor affinity makes the polyolefin membrane unable to quickly absorb the electrolyte and effectively retain the electrolyte, which will greatly affect the performance of the separator in lithium-ion batteries and there is a certain risk of leakage

Method used

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  • High-temperature-resistant polymer modified ceramic diaphragm and application thereof
  • High-temperature-resistant polymer modified ceramic diaphragm and application thereof
  • High-temperature-resistant polymer modified ceramic diaphragm and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Prepare the ceramic diaphragm:

[0056] 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.

[0057] Preparation of high temperature resistant polymer modified ceramic diaphragm:

[0058] Use the first solvent to prepare pyrrole monomer with a mass fraction of 0.1% and FeCl with a mass fraction of 0.05% 3 mixed solution, the first solvent is H with a volume ratio of 1:2 2 O / ethanol mixture. Soak the aluminum oxide ceramic diaphragm in the mixed solution for 6 hours, wash and dry to remove the first solvent, and obtain a high-temperat...

Embodiment 2

[0060] Prepare the ceramic diaphragm:

[0061] 90 parts by mass of silicon dioxide inorganic powder with a particle diameter of about 500nm, 5 parts by mass of gelatin, 5 parts by mass of polyvinyl alcohol, and the second solvent is a water / isopropanol mixed solution with a volume ratio of 1:2 to prepare a solid The ceramic slurry with a content of 15% is coated on the surface of a single layer of a commercial polypropylene (PE) diaphragm, and dried to remove the second solvent to obtain a silicon dioxide ceramic diaphragm.

[0062] Preparation of high temperature resistant polymer modified ceramic diaphragm:

[0063] The first solvent preparation mass fraction is the mixed solution of the aniline monomer of 2% and the ammonium persulfate of mass fraction 1.5%, and the first solvent is the H of volume ratio 1: 3 2 O / isopropanol mixture. The above-mentioned mixed solution was coated on the surface of the above-mentioned silica ceramic diaphragm single layer, left to age for 8...

Embodiment 3

[0065] Prepare the ceramic diaphragm:

[0066]92 parts by mass of magnesium oxide inorganic powder with a particle diameter of about 600nm, 5 parts by mass of sodium methylcellulose, 3 parts by mass of styrene-butadiene rubber, and the second solvent is a water / acetone mixed solution with a volume ratio of 2:3, and is formulated into The ceramic slurry with a solid content of 12% is coated on the surface of a single-layer commercial polypropylene diaphragm, and dried to remove the second solvent to obtain a magnesium oxide ceramic diaphragm.

[0067] Preparation of high temperature resistant polymer modified ceramic diaphragm:

[0068] Prepare a mixed solution of 5% thiophene monomer and 1.5% hydrogen peroxide with a mass fraction of the first solvent, and the first solvent is H at a volume ratio of 1:3. 2 O / acetone mixture. The above-mentioned mixed solution is coated on the double-layer surface of the above-mentioned magnesia ceramic diaphragm, left to age for 12 hours, wa...

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Abstract

The invention discloses a high-temperature-resistant polymer modified ceramic diaphragm and an application thereof. The high-temperature-resistant polymer modified ceramic diaphragm comprises a porousbase membrane, and at least one surface of the porous base membrane is coated with a ceramic layer; and a high-temperature-resistant polymer layer is arranged on the surface and in the interior of pores of the ceramic layer, in the interior of pores of the porous base membrane, and on the surface not coated with the ceramic layer in an in-situ polymerization manner. The high-temperature-resistantpolymer modified ceramic diaphragm has relatively high thermal stability. Through the in-situ polymerization method of pyrrole, the thiophene and the aniline monomer, a high-temperature-resistant polymer protection layer is formed on the surface and in the interior of pores of the ceramic layer, on the surface of the porous base membrane, and in the pores in an in-situ coating manner, so that theceramic layer, the polymer layer and the base membrane form an organic integrated body; therefore, the thermal size stability of the modified ceramic diaphragm is improved, and the modified ceramic diaphragm does not contract at a high temperature of 200 DEG C; and in addition, relatively high mechanical performance is still kept, positive and negative electrode contact can be effectively obstructed, and the safety performance of the battery can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a high-temperature resistant polymer modified ceramic diaphragm and its application. 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 micr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/42C08G73/06C08G73/02C08G61/12H01M50/403H01M50/411H01M50/417H01M50/434H01M50/443H01M50/449H01M50/451H01M50/489H01M50/491H01M50/497
CPCH01M10/0525H01M10/4235C08G61/126C08G73/0266C08G73/0611C08G2261/3223C08G2261/354C08G2261/11H01M50/403H01M50/431H01M50/411H01M50/449Y02E60/10
Inventor 赵金保彭龙庆张鹏沈秀
Owner XIAMEN UNIV
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