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Application of porous composite membrane in lithium-ion battery

A porous composite membrane, lithium-ion battery technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problem that the pore size and porosity of the microporous membrane are difficult to control, affect the cycle performance, charge-discharge efficiency, safety performance and The problem of low reliability, etc., achieves the effects of being beneficial to cycle stability, simple and controllable preparation methods, and expanding types and scope of use.

Inactive Publication Date: 2017-03-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dry stretching process is relatively simple and non-polluting. It is a common method for the preparation of lithium-ion battery separators. However, the pore size and porosity of the produced microporous membranes are difficult to control. The probability is relatively high, and the safety performance and reliability are not high
The lyophobicity of the PP film surface prevents the electrolyte from fully infiltrating the separator surface, thereby increasing the internal resistance of the battery and affecting cycle performance and charge-discharge efficiency
The wet process requires a large amount of solvent, which is easy to cause environmental pollution. Compared with the dry process, the process is relatively complicated
Using polyethylene base material, the melting point is only 140°C, and the thermal stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 10 g of PEI was dissolved in 38 g of DMAC, and stirred at an experimental temperature of 25° C. for 2 hours to obtain a PEI solution. Add 2g of silicon dioxide to the prepared PEI solution, and stir for 2 hours at an experimental temperature of 25°C, wherein the mass concentration of PEI is 20%, and the mass concentration of silicon dioxide is 4%, to obtain a mixed solution of PEI and silicon dioxide .

[0027] The obtained mixed solution of PEI and silica was allowed to stand still for 10 hours.

[0028] The static mixed solution of PEI and silicon dioxide was used to form the membrane, the experimental temperature was 25°C, and the experimental humidity was 50%.

[0029] The prepared film was formed by the humidity phase inversion method, the test time was 10 minutes, the test temperature was 40° C., and the test humidity was 100%.

[0030] The contact angle test of the produced film was 39.2°; the tensile strength test was 27.3 MPa; the thermal stability test of th...

Embodiment 2

[0032] 10 g of PEI was dissolved in 35 g of DMAC, and stirred at an experimental temperature of 25° C. for 2 hours to obtain a PEI solution. Add 5g of silicon dioxide to the prepared PEI solution, and stir for 2 hours at an experimental temperature of 25°C, wherein the mass concentration of PEI is 20%, and the mass concentration of silicon dioxide is 10%, to obtain a mixed solution of PEI and silicon dioxide .

[0033] The obtained mixed solution of PEI and silica was allowed to stand still for 10 hours.

[0034] The static mixed solution of PEI and silicon dioxide was used to form the membrane, the experimental temperature was 25°C, and the experimental humidity was 50%.

[0035] The prepared film was formed by the humidity phase inversion method, the test time was 10 minutes, the test temperature was 40° C., and the test humidity was 100%.

[0036] The contact angle test of the produced film was 38.7°; the tensile strength test was 36.3 MPa; the thermal stability test of t...

Embodiment 3

[0038] 10 g of PEI was dissolved in 30 g of DMAC, and stirred at an experimental temperature of 25° C. for 2 hours to obtain a PEI solution. Add 10g of silicon dioxide to the PEI solution that has been prepared, and stir for 2 hours at an experimental temperature of 25°C, wherein the mass concentration of PEI is 20%, and the mass concentration of silicon dioxide is 10%, to obtain a mixed solution of PEI and silicon dioxide .

[0039] The obtained mixed solution of PEI and silica was allowed to stand still for 10 hours.

[0040] The static mixed solution of PEI and silicon dioxide was used to form the membrane, the experimental temperature was 25°C, and the experimental humidity was 50%.

[0041] The prepared film was formed by the humidity phase inversion method, the test time was 10 minutes, the test temperature was 40° C., and the test humidity was 100%.

[0042] The contact angle test of the produced film was 39.6°; the tensile strength test was 40.3 MPa; the thermal stab...

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Abstract

The invention relates to an application of a porous composite membrane in a lithium-ion battery. The porous composite membrane is a blend porous membrane prepared from polyetherimide and one or more than two of silicon dioxide, titanium dioxide and zirconium dioxide; and the mass ratio of the polyetherimide to one or more than two of the silicon dioxide, the titanium dioxide and the zirconium dioxide is (10-40) to (1-30). The target of strengthening modification can be achieved through addition of the silicon dioxide. The membrane is uniform in pore size distribution, a lot of small holes are distributed in the porous membrane, the holes are in zigzag communication and the service life of the lithium-ion battery can be prolonged. The membrane also has relatively high heat stability and the security performance of the battery is improved.

Description

technical field [0001] The invention relates to the application of a porous composite membrane in batteries, in particular to its application in lithium ion batteries. Background technique [0002] Energy is an important material basis for human survival and social development, and an important cornerstone for national economy, national security and sustainable development. At present, my country has become a major energy production and consumption country in the world, and my country's demand for energy continues to grow. Therefore, rational and effective use of renewable energy is an important way to meet energy demand. Renewable energy includes: wind energy, solar energy, biomass energy, ocean energy and small hydropower, etc., which are primary energy and are usually converted into electrical energy for use. In the process of developing and utilizing renewable energy, energy storage technology plays an important role. Energy storage technologies include physical energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/446H01M50/489
CPCH01M10/0525H01M50/40H01M50/409H01M50/403Y02E60/10
Inventor 史丁秦李先锋张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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