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Polyolefin non-woven fabric enhanced gel polymer electrolyte membrane and preparation method thereof

A technology of gel polymer and electrolyte membrane, which is applied in the direction of circuits, electrical components, secondary batteries, etc., can solve problems such as poor bonding force, battery short circuit, polymer shedding, etc., and achieve improved bonding force, excellent product performance, and good The effect of thermal performance

Inactive Publication Date: 2013-03-20
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problems are: the direct impregnation method is used to prepare the gel polymer electrolyte membrane, and the bonding force between the non-woven fabric and the polymer is poor, which will easily cause the polymer to fall off and cause the battery to short circuit.

Method used

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  • Polyolefin non-woven fabric enhanced gel polymer electrolyte membrane and preparation method thereof
  • Polyolefin non-woven fabric enhanced gel polymer electrolyte membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Select polyvinylidene fluoride with a mass-to-mass ratio (the ratio of solute mass to solvent volume) of 20%, dissolve it in a solvent with a volume ratio of acetone:DMF=4:6, stir at 60°C for 60 minutes, and cool at room temperature , let stand for 50min for later use.

[0022] (2) The ES staple fiber nonwoven fabric with a thickness of 30 μm and a porosity of 44% was selected as the reinforcing substrate, immersed in a test tube filled with styrene, and modified by radiation grafting after sealing.

[0023] (3) Scrape-coat the solution prepared in (1) on the non-woven fabric after graft modification in (2) to obtain a non-woven fabric reinforced polymer film with a coating thickness of 10 μm and a coating speed of 1.2 m / min . The composite membrane was immersed in a 20°C water bath for 30 minutes to remove the solvent, rinsed with water and then dried.

[0024] (4) immerse the composite membrane prepared in (3) into the electrolyte for activation, and the selecte...

Embodiment 2

[0026] (1) Select polyvinylidene fluoride with a mass-to-mass ratio (the ratio of solute mass to solvent volume) of 30%, dissolve it in a solvent with a volume ratio of acetone:DMF=5:5, stir at a constant temperature of 50°C for 90min, and cool at room temperature , let it stand for 30min for later use.

[0027] (2) A polypropylene non-woven fabric with a thickness of 40 μm and a porosity of 70% was selected as the reinforcing substrate, immersed in a test tube filled with styrene, and modified by radiation grafting after sealing.

[0028] (3) Scrape-coat the solution prepared in (1) on the non-woven fabric after graft modification in (2) to obtain a non-woven fabric reinforced polymer film with a coating thickness of 20 μm and a coating speed of 2.5 m / min . The composite membrane was immersed in a 40°C water bath for 20 minutes to remove the solvent, rinsed with clean water and then dried.

[0029] (4) immerse the composite membrane prepared in (3) into the electrolyte for ...

Embodiment 3

[0031] (1) Select polyvinylidene fluoride with a mass-to-mass ratio (the ratio of solute mass to solvent volume) of 50% and dissolve it in a solvent with a volume ratio of acetone:DMF=6:4, stir at a constant temperature of 70°C for 30min, and cool at room temperature , stand for 40min for later use.

[0032] (2) Select ES staple fiber non-woven fabric with a thickness of 50 μm and a porosity of 50% as the reinforcing substrate, immerse it in a test tube filled with styrene, and modify it by radiation grafting after sealing.

[0033] (3) Scrape-coat the solution prepared in (1) on the non-woven fabric after graft modification in (2) to obtain a non-woven fabric reinforced polymer film with a coating thickness of 40 μm and a coating speed of 4.6 m / min . The composite membrane was immersed in a water bath at 60°C for 10 minutes to remove the solvent, rinsed with water and then dried.

[0034] (4) immerse the composite membrane prepared in (3) into the electrolyte for activation...

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Abstract

The invention discloses a polyolefin non-woven fabric enhanced gel polymer electrolyte membrane and a preparation method thereof. The preparation method comprises the following steps of: adding a polymer in a mixed solvent of acetone and N, N-dimethylformamide (DMF) according to a certain volume ratio, so as to prepare a clear polymer solution; carrying out surface modification on non-woven fabric by a radiation grafting method, so that the bonding force between the non-woven fabric and the polymer can be improved; coating the polymer solution on the modified non-woven fabric in a scraping manner, and soaking the coated non-woven fabric for water bath, so as to remove the solvent and dry; and soaking a prepared composite membrane in electrolyte for activation, so as to obtain the enhanced gel polymer electrolyte membrane. The non-woven fabric enhanced gel polymer electrolyte membrane provided by the invention has the advantages of good mechanical property, good thermal property and high ion conductivity. The preparation method provided by the invention has the advantages of simple process and low cost, and is applicable to industrial production.

Description

technical field [0001] The invention relates to a polymer electrolyte membrane for lithium ion batteries, in particular to a polyolefin non-woven reinforced gel polymer electrolyte membrane and a preparation method thereof. Background technique [0002] Energy and the environment are two severe problems that human beings must face in the 21st century. The continuous development of new energy and clean and renewable energy is an important basis for the sustainable development of human society. Polymer lithium ion battery is the highest level of lithium battery research so far. In addition to the characteristics of liquid lithium ion battery, it also has advantages in geometry, capacity, charge and discharge, cycle life and environmental protection. At the same time, there will be no leakage pollution and combustion explosion, which fundamentally solves potential safety hazards. [0003] Polymer electrolyte membrane is the key material of polymer lithium-ion batteries, and do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCY02E60/12Y02E60/10
Inventor 阮艳莉齐平平赖桂泉
Owner TIANJIN POLYTECHNIC UNIV
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