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High-stability polymer bonding inorganic oxide battery diaphragm coating and preparation method thereof

An inorganic oxide, lithium battery separator technology, applied in battery pack parts, separators/films/diaphragms/spacers, circuits, etc., can solve problems such as peeling, easy peeling of inorganic oxide coatings, etc. Controllable, simple process effects

Inactive Publication Date: 2017-01-18
武汉格物天成新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical defect that the inorganic oxide coating is easy to peel off and fall off, the present invention provides a highly stable polymer-bonded inorganic oxide lithium battery separator coating and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Disperse α-alumina powder with a D50 of 0.5um in deionized water at a mass ratio of 1:10, and stir for 1 hour to obtain an alumina-water dispersion.

[0026] Under stirring conditions, 0.1mol / L hydrochloric acid solution and 0.1mol / L sodium hydroxide solution were used to adjust the pH of the alumina-water dispersion, and its isoelectric point was measured to be 7.3.

[0027] Titrate with 0.1 mol / L hydrochloric acid solution to reduce the pH value of the alumina-water dispersion to 5.

[0028] Add the polyvinylidene fluoride-styrene sulfonic acid (PVDF-g-PSSA) binder into the alumina-water dispersion with a pH value of 5 according to the ratio of polymer:inorganic oxide 1:1, and stir for 1 hour to obtain a coating. cloth slurry.

[0029] The slurry was coated on the surface of the polypropylene separator by roller coating, and after drying at 70°C, a polymer-bonded inorganic oxide coating was obtained with a thickness of 2 μm±0.5 μm.

[0030] Use a universal material ...

Embodiment 2

[0032] Disperse silicon oxide powder with a D50 of 1 μm in deionized water at a mass ratio of 1:3, and stir for 2 hours to obtain a silicon oxide-water dispersion.

[0033] Under stirring conditions, 0.1mol / L hydrochloric acid solution and 0.1mol / L sodium hydroxide solution were used to adjust the pH of the alumina-water dispersion, and its isoelectric point was measured to be 3.2.

[0034] Titrate with 0.1 mol / L hydrochloric acid solution to reduce the pH value of the silicon oxide-water dispersion to 2.2.

[0035] The polyvinylidene fluoride-hexafluoropropylene-styrene sulfonic acid (PVDF-HFP-g-PSSA) binder was added to the silica-water dispersion with a pH value of 2.2 at the ratio of polymer: inorganic oxide 2:1 solution, stirred for 0.5h to obtain a coating slurry.

[0036] The slurry was coated on the surface of the polyethylene separator by spraying, and after drying at 80°C, a polymer-bonded inorganic oxide coating was obtained with a thickness of 3 μm±0.7 μm.

[003...

Embodiment 3

[0039]Disperse the mixed powder of alumina-silica (30wt% silica content) with a D50 of 1.5um in deionized water at a mass ratio of 1:20, and stir for 0.5h to obtain a silica-water dispersion.

[0040] Under stirring conditions, 0.1mol / L hydrochloric acid solution and 0.1mol / L sodium hydroxide solution were used to adjust the pH of the alumina-silicon oxide-water dispersion, and its isoelectric point was measured to be 6.5.

[0041] Titrate with 0.1 mol / L hydrochloric acid solution to reduce the pH value of the alumina-silicon oxide-water dispersion to 3.5.

[0042] The sulfonated polystyrene binder was added into the alumina-silicon oxide-water dispersion with a pH value of 3.5 at a ratio of polymer:inorganic oxide of 0.5:1, and stirred for 2 hours to obtain a coating slurry.

[0043] The slurry was coated on the surface of the polyethylene separator by scraping, and after drying at 60°C, a polymer-bonded inorganic oxide coating was obtained, with a thickness of 3 μm±1 μm.

...

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Abstract

The invention belongs to the field of new energy resource material and particularly relates to a high-stability polymer bonding inorganic oxide battery diaphragm coating and a preparation method thereof. The high-stability polymer bonding inorganic oxide battery diaphragm coating is characterized in that the characteristic that a surface zata potential is a positive value when the pH value of an aluminum oxide and silicon oxide dual-property inorganic oxide is smaller than an equipotential point is utilized, a polymer binder with negative charge on functional groups and inorganic oxide perform electrostatic self-assembly to form tight chemical bonds, and the inorganic oxide coating stable in structure is formed after coating. The preparation method comprises the main process steps that preparing inorganic oxide-water dispersion solution, measuring the oxide of the solution, regulating the pH value of the inorganic oxide-water dispersion solution to be below the equipotential point, making a polymer with sulfonate radical side chains and the inorganic oxide perform electrostatic self-assembly to form slurry, and performing coating and drying. By the adoption of the method, the bonding power of the binder and the inorganic oxide is strengthened, the slurry coating process of the inorganic oxide battery diaphragm coating is completely consistent with a traditional coating technology, the process is simple, and the cost is controllable.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a highly stable polymer bonded inorganic oxide lithium battery diaphragm coating and a preparation method thereof. Background technique [0002] As a key component material of lithium batteries, the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle, and especially safety performance of the battery. Commonly used lithium battery separators are mainly polypropylene (PP), polyethylene (PE) polyolefin polymer materials. With the increase in energy density requirements, the temperature inside the lithium battery will rise rapidly above the melting point of polyolefin under overcharge / overdischarge or other extreme conditions of improper use, causing the diaphragm to fuse and the positive and negative electrodes to be directly connected to each other in a local area. contact and short circuit,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/446
CPCH01M50/409H01M50/403Y02E60/10
Inventor 唐浩林习洋洋李俊生
Owner 武汉格物天成新材料科技有限公司
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