Composite polymer separator and preparation method thereof

A technology of composite polymers and diaphragms, applied in chemical instruments and methods, synthetic resin layered products, electrical components, etc., can solve the problems of material safety limitations, poor thermal shrinkage, low porosity, etc., and achieve air permeability. Good properties, strong high temperature resistance and simple preparation method

Active Publication Date: 2013-04-24
ADVANCED ELECTRONICS ENERGY LIMITED GUANGDONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it also has the following disadvantages: low porosity, limited strength, poor thermal shrinkage, and limitations in material safety

Method used

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  • Composite polymer separator and preparation method thereof
  • Composite polymer separator and preparation method thereof
  • Composite polymer separator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] For the composite polymer separator prepared in this example, the selected base film is a polyethylene (PE) film with a thickness of 16 microns.

[0025] The preparation method of the composite polymer diaphragm of the present embodiment:

[0026] 1) Weigh 8.9869 grams of vinylidene fluoride-hexafluoropropylene copolymer P(VDF-HFP) as the solute, measure 100 ml of N-methylpyrrolidone (NMP) as the solvent, and weigh 0.4493 grams of silicon dioxide; The three are mixed and stirred at room temperature to dissolve, then heated to 40-60°C and fully stirred and mixed until a uniform colloidal film-forming solution is formed, and then left to stand for use;

[0027] 2) Coat the above-mentioned film-forming liquid on the surface (single side) of the base film through the coating equipment (scraper or coating machine) at room temperature to form a wet film, and the thickness of the coating (film-forming liquid) is determined by the coating Override device control;

[0028] 3) ...

Embodiment 2

[0038] For the composite polymer separator prepared in this embodiment, the base film selected is polyethylene film with a thickness of 16 microns.

[0039] The preparation method of the composite polymer diaphragm of the present embodiment:

[0040] 1) Weigh 8.9869 grams of vinylidene fluoride-hexafluoropropylene copolymer P(VDF-HFP), measure 100 ml of N-methylpyrrolidone (NMP) as a solvent, and weigh 0.2696 grams of silicon dioxide; Mix and stir at room temperature to dissolve, then heat to 40-60°C and stir to mix thoroughly until a uniform colloidal film-forming solution is formed, and then stand for use;

[0041] 2) Coat the above-mentioned film-forming liquid on the surface (single side) of the base film through the coating equipment (scraper or coating machine) at room temperature to form a wet film, and the thickness of the coating (film-forming liquid) is determined by the coating Override device control;

[0042] 3) Soak the wet film in water for 5 hours at room tem...

Embodiment 3

[0049] In the composite polymer diaphragm, the base film selected is polyethylene film with a thickness of 16 microns.

[0050] The preparation method of the composite polymer diaphragm of the present embodiment:

[0051] 1) Weigh 8.9869 grams of polyvinylidene fluoride (PVDF HSV900) as the solute, measure 100 ml of N-methylpyrrolidone (NMP) as the solvent, and weigh 0.4493 grams of silicon dioxide, mix the three and stir at room temperature Dissolve, then heat to 40-60°C and stir to mix thoroughly until a uniform colloidal film-forming solution is formed, then stand for use;

[0052] 2) At room temperature, apply the film-forming liquid prepared above to the surface (single side) of the inner layer film through the coating equipment (scraper or coating machine, etc.) to form a wet film, and the thickness of the coating (film-forming liquid) Controlled by coating equipment;

[0053] 3) Soak the wet film in water at room temperature;

[0054] 4) Take out the wet film, heat a...

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Abstract

The present invention discloses a composite polymer separator which is composed of a polyolefin-based separator and coating film on the polyolefin-based separator. The coating film is composed of the following raw materials, by mass: 5-10 parts of PVDF, 90-120 parts of NMP, and 0.1-3 parts of SiO2. A preparation method for the composite polymer separator comprises the following steps: 1) uniformly mixing the various raw materials to give a film-forming solution; 2) coating the film-forming solution on the surface of the polyolefin-based separator to obtain a wet separator; 3) performing soaking treatment in water to the wet separator; and 4) removing the wet separator and drying. The separator prepared in the invention had good permeability, good mechanical properties, and strong resistance to high temperature. After battery tests, the battery made by using the separator of the present invention has a voltage platform, a specific discharge capacity and cycle performance better than those of a battery made by using a commercial separator; and the preparation method of the separator is simple, thereby saving manufacturing cost.

Description

technical field [0001] The invention relates to a composite polymer diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators and electrolytes. Separator is an important part of lithium-ion battery. Its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity and cycle performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. At present, most commercial separators use polyethylene (PE) or polypropylene (PP) separators, which have higher porosity, lower electrical resistance, higher tear strength, better acid and alkali resistance, and good Elasticity and retention of aprotic solvents. However, it also has the following disadvantages: low porosity, limited strength, poor thermal shrinkage, and limitations in mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B32B27/32
CPCY02E60/12Y02E60/10
Inventor 叶丽吉冈诚饶睦敏李建利
Owner ADVANCED ELECTRONICS ENERGY LIMITED GUANGDONG
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