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Temperature-sensitive diaphragm, preparation method thereof and application of temperature-sensitive diaphragm

A diaphragm and temperature-sensitive technology, applied in the field of temperature-sensitive diaphragms and their preparation, can solve the problems that the battery cannot be restored to use, the heat sealing film is not reversible, etc., and achieves excellent flexibility, good reversibility, and strong controllability. Effect

Inactive Publication Date: 2020-04-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat-sealing film used in the prior art is often not reversible. When the battery returns to the normal temperature range from high temperature, the battery usually cannot be restored to use. Although the safety problem can be solved to a certain extent, certain safety problems appear. After that, the battery still needs to be replaced with a new one

Method used

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  • Temperature-sensitive diaphragm, preparation method thereof and application of temperature-sensitive diaphragm
  • Temperature-sensitive diaphragm, preparation method thereof and application of temperature-sensitive diaphragm
  • Temperature-sensitive diaphragm, preparation method thereof and application of temperature-sensitive diaphragm

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Effect test

Embodiment 2

[0056] Embodiment 2 of the present invention is: a method for preparing a temperature-sensitive diaphragm, and the specific steps include:

[0057] (1) Graphene oxide is hydroxylated, specifically:

[0058] Suspend 0.50 g of graphene oxide evenly in 250 mL of deionized water, ultrasonicate for 30 minutes, add 6.3 g of 4-aminophenethyl alcohol and 75 mL of isoamyl nitrite to the graphene oxide suspension, and fill the reactor with a condenser. Inject nitrogen, heat at 60°C, and reflux for 3 hours. After the reaction, the mixture is separated by vacuum filtration, and washed with 250mL acetone, 250mL dimethylformamide, 250mL deionized water and 250mL acetone several times. Finally, the reaction product was washed with 250 mL of ether, and dried in a vacuum oven to obtain hydroxylated graphene oxide, which was named GO-OH.

[0059] (2) introducing organic Br groups on the graphene oxide surface after hydroxylation treatment, specifically:

[0060] Disperse 220 mg of GO-OH obtai...

Embodiment 3

[0064] Embodiment 3 of the present invention is: a method for preparing a temperature-sensitive diaphragm, and the specific steps include:

[0065] (1) Graphene oxide is hydroxylated, specifically:

[0066] Suspend 0.50g of graphene oxide evenly in 250mL of deionized water, ultrasonicate for 30 minutes, add 6.3g of 4-aminophenethyl alcohol and 75mL of isoamyl nitrite to the graphene oxide suspension, and fill the reactor with condenser Nitrogen, heated at 60°C, and refluxed for 3 hours. After the reaction, the mixture was separated by vacuum filtration, and washed with 250mL acetone, 250mL dimethylformamide, 250mL deionized water and 250mL acetone several times. Finally, the reaction product was washed with 250 mL of ether, and dried in a vacuum oven to obtain hydroxylated graphene oxide, which was named GO-OH.

[0067] (2) The surface of graphene oxide introduces organic Br groups, specifically:

[0068] Disperse 220 mg of GO-OH obtained in step (1) in 50 mL of tetrahydrofu...

Embodiment 8

[0104] Embodiment 8 of the present invention is: a preparation method of a battery, the specific steps include: using reduced graphene oxide as the positive electrode of the battery, lithium sheets as the negative electrode of the battery, commercial 1M LiFP 6 The EC:DEC (volume ratio is 1:1, add 10% FEC) solution is electrolyte, and the temperature-sensitive separator GO-PMEDSA prepared in embodiment 7 is sandwiched between two glass fiber membranes (GF) and assembled as battery separator Button cell test temperature sensitive separator GO-PMEDSA separator performance.

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Abstract

The invention discloses a temperature-sensitive diaphragm, a preparation method thereof and application of the temperature-sensitive diaphragm. The temperature-sensitive diaphragm is prepared from a composite material; the composite material comprises a matrix layer and a polymer layer grafted on the matrix layer; the matrix layer is graphene oxide (GO); and the polymer layer is polysulfobetaine.The preparation method comprises the following steps that: hydroxylation treatment is performed on GO, so that GO-OH can be obtained; an organic Br group is introduced to the surface of GO-OH; polysulfobetaine is covalently grafted to the surface of GO, and a composite material is obtained; the composite material is dispersed, and the dispersed composite material is prepared into a composite filmthrough vacuum filtration. According to the temperature-sensitive diaphragm, the preparation method thereof and the application of the invention, the temperature-sensitive polymer polysulfobetaine isintegrated into a diaphragm, so that the temperature-responsive intelligent diaphragm can be obtained; and on the basis of the temperature response behavior of the polysulfobetaine, reversible controlover lithium ion transmission by the diaphragm at different temperatures is realized, and exothermic side reaction and thermal runaway are sensed and inhibited in time.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a temperature-sensitive diaphragm, a preparation method and application thereof. Background technique [0002] The shortage of energy makes energy storage technology particularly important. Energy storage mainly refers to the storage of electrical energy, and batteries and capacitors are two commonly used energy storage components. Capacitors have high charge and discharge efficiency, while batteries have high energy density. Therefore, the two are usually used in complementary ways. [0003] Commonly used batteries include lithium-ion batteries, lithium-sulfur batteries, and proton exchange membrane fuel cells, among which lithium-ion batteries are currently the most widely used battery. Lithium-ion battery is a green high-energy battery that appeared in the 1990s, and has attracted much attention in the fields of energy chemistry and material chemistry. At present, lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/42H01G2/14H01G11/52
CPCH01G2/14H01G11/52H01M10/0525H01M10/4235H01M2200/10H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 谢莹陈小飞熊翔
Owner CENT SOUTH UNIV
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