Gel polymer electrolyte membrane for lithium ion secondary battery and preparation method of gel polymer electrolyte membrane

A technology of gel polymer and electrolyte membrane, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of large interface resistance, poor affinity of electrolyte, and easy leakage of electrolyte, so as to reduce production costs, The effect of high ionic conductivity and excellent interfacial stability

Inactive Publication Date: 2012-01-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the reports on fluorine-containing gel polymer electrolytes are based on porous polyvinylidene fluoride [Mohamed N.S, Arof A.K.Journal of Power Sources.2004.132: 229], and the porous electrolyte impregnated with electrolyte has a fast charge and discharge rate. , better electrochemical stability and better mechanical properties than the porous polyolefin separator, but its affinity for the electrolyte is poor, and the electrolyte is easy to leak during the use of the battery
Copolymers formed by introducing hexafluoropropylene units to reduce the crystallinity of polyvinylidene fluoride [Stephan A.M, Renganathan N.G, Gopukumar S., Dale-Teeters.Materials Chemistry and Physics.2004, 8:6], although The liquid absorption ability has been improved to a certain extent, but the problem of weak liquid absorption ability cannot be solved fundamentally, and the compatibility between the above-mentioned fluorine-containing gel polymer electrolyte membrane and the electrode is poor, and the interface resistance is large.

Method used

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  • Gel polymer electrolyte membrane for lithium ion secondary battery and preparation method of gel polymer electrolyte membrane
  • Gel polymer electrolyte membrane for lithium ion secondary battery and preparation method of gel polymer electrolyte membrane
  • Gel polymer electrolyte membrane for lithium ion secondary battery and preparation method of gel polymer electrolyte membrane

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Effect test

Embodiment 1

[0038] (1) Fluoropolymer solution (Shandong Dongyue Group, ion exchange capacity is 1.18mmol / g, number average molecular weight is 150,000, solvent N, the mass fraction of N-dimethylformamide is 70%), in The polymer electrolyte membrane is prepared by solution casting at 100°C. Wherein the chemical structural formula of the fluoropolymer is as follows:

[0039]

[0040] Wherein m and n are respectively integers of 1 to 10000; and m / (m+n)=55% to 90%;

[0041] (2) Heat the polymer electrolyte membrane with 5% hydrogen peroxide at a temperature of 80°C for 1 hour, then heat it with deionized water at a temperature of 80°C for 1 hour, and then heat it with 2mol / L sulfuric acid solution at 80°C heating at low temperature for 1 hour, and finally heating with deionized water at a temperature of 80° C. for 1 hour to obtain a pretreated polymer electrolyte membrane.

[0042](3) Immerse the pretreated polymer electrolyte membrane in a 2mol / L lithium hydroxide solution, heat and ref...

Embodiment 2

[0050] (1) Fluoropolymer solution (Shandong Dongyue Group, ion exchange capacity is 0.91mmol / g, number average molecular weight is 80,000, solvent N, the mass fraction of N-dimethylacetamide is 70%), in A polymer electrolyte membrane is prepared by solution casting at 160°C. Wherein the chemical structural formula of the fluoropolymer is as follows:

[0051]

[0052] Wherein m and n are integers of 1 to 10000 respectively, and m / (m+n)=55% to 90%;

[0053] (2) Heat the polymer electrolyte membrane with 1% hydrogen peroxide at a temperature of 100°C for 0.5 hours, then heat it with deionized water at a temperature of 100°C for 0.5 hours, and then heat it with 1mol / L sulfuric acid solution at 100°C heating at low temperature for 0.5 hours, and finally heating with deionized water at a temperature of 100°C for 0.5 hours to obtain a pretreated polymer electrolyte membrane.

[0054] (3) Immerse the pretreated polymer electrolyte membrane in a 1mol / L lithium hydroxide solution, ...

Embodiment 3

[0061] (1) Fluorine-containing polymer solution (Shandong Dongyue Group, ion exchange capacity is 0.98mmol / g, number average molecular weight is 170,000, and the mass fraction of solvent dimethyl sulfoxide is 60%) is passed through at 100°C The method of solution casting to form a membrane is prepared into a polymer electrolyte membrane. Wherein the chemical structural formula of the fluoropolymer is as follows:

[0062]

[0063] Wherein m and n are integers of 1 to 10000 respectively, and m / (m+n)=55% to 90%;

[0064] (2) Heat the polymer electrolyte membrane with 5% hydrogen peroxide at 60°C for 1 hour, then heat it with deionized water at 60°C for 1.5 hours, and then heat it with 2mol / L sulfuric acid solution at 60°C heating at low temperature for 1.5 hours, and finally heating with deionized water at 60° C. for 1.5 hours to obtain a pretreated polymer electrolyte membrane.

[0065] (3) Immerse the pretreated polymer electrolyte membrane in a 2mol / L lithium hydroxide so...

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Abstract

The invention discloses a gel polymer electrolyte membrane for a lithium ion secondary battery and a preparation method of the gel polymer electrolyte membrane. The gel polymer electrolyte membrane comprises 30 to 70 mass percent of polymer electrolyte membrane. The preparation method comprises the following steps of: preparing the polymer electrolyte membrane by using fluorine-containing polymer solution by a solution casting film formation method; performing lithiation and vacuum drying on the polymer electrolyte membrane respectively; and then soaking the polymer electrolyte membrane in electrolyte solution, and thus obtaining the gel polymer electrolyte membrane. The gel polymer electrolyte membrane provided by the invention has extremely high liquid absorbing capacity and liquid keeping capacity; and lithium ions exist on a branched chain of the polymer electrolyte membrane, so that electric conductivity equivalent to liquid electrolyte can be reached only by adding a small quantity of lithium salt into the battery, and the manufacturing cost of the battery is reduced.

Description

technical field [0001] The invention relates to an electrolyte membrane for a battery and a preparation method thereof, in particular to a gel polymer electrolyte membrane for a lithium-ion secondary battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have developed rapidly in recent years due to their advantages such as no pollution, no memory effect, high specific energy (energy density is 3-4 times that of lead-acid batteries, 2 times that of nickel-metal hydride batteries), and light weight. It is widely used in communications and notebook computers, and it will also have broad development space in terms of power batteries. Currently, there are two types of Li-ion batteries, those using liquid organic electrolytes and those using solid or gel polymer electrolytes. The room temperature ionic conductivity of all-solid polymer electrolytes has so far been unable to reach 10 -3 S / cm -1 The level of application [Komiya, Hayashi A,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 李磊蔡志军牛淑娟高建平朱立华
Owner SHANGHAI JIAO TONG UNIV
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