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Composite gel polymer electrolyte based on solid polymer electrolyte, and preparation method and application thereof

A solid polymer and composite gel technology, applied in the field of lithium-ion batteries, can solve the problems of high anion transfer coefficient, difficulty in wide application, and poor mechanical strength, and achieve good cycle performance, wide electrochemical window, and high mechanical strength. Effect

Inactive Publication Date: 2013-07-10
DKJ NEW ENERGY S & T CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the poor mechanical strength, high production cost, high anion transfer coefficient and large polarization of existing gel polymer electrolytes, which are extremely difficult to be widely used in large-capacity, high-power, high-energy-density lithium-ion batteries To provide a kind of composite gel polymer based on solid polymer electrolyte with high conductivity, high ion transfer number, good mechanical properties, high safety performance, stable chemical properties, low production cost, and good compatibility with common electrode materials electrolyte

Method used

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  • Composite gel polymer electrolyte based on solid polymer electrolyte, and preparation method and application thereof
  • Composite gel polymer electrolyte based on solid polymer electrolyte, and preparation method and application thereof
  • Composite gel polymer electrolyte based on solid polymer electrolyte, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0027] (1) Polyethylene oxide (molecular weight: 100,000), LiClO 4 、TiO 2 (particle size 50 nanometers) weighed according to the ratio of 8.7:1:0.3 by mass percentage, heated to 120°C under stirring, turned into a uniform solid solution, and then poured onto a stainless steel plate, pressed to a thickness of 10 microns solid polymer electrolyte membrane and cooled to room temperature.

[0028] (2) In a molten state, a porous polyethylene film with a thickness of 10 micrometers obtained by thermal stretching at 80°C is placed on top of the above-mentioned solid polymer electrolyte membrane, and then heated to 60°C. The solid polymer electrolyte composite membrane was obtained by pressing for 1 hour under the pressure of 10 atmospheres.

[0029] (3) After cutting the above composite film into an appropriate size, place it in a vacuum drying oven at 80 °C for 24 hours to remove trace moisture, cool it to room temperature in vacuum, and transfer it into an anhydrous and oxygen-f...

Embodiment 2

[0043] (1) Dissolve polyvinyl alcohol (PVA, degree of alcoholysis ≥98%, Mw: 105000, 200 mg) and boric acid (148 mg) in 20 ml of DMSO, then heat at 80 °C for 8 hours, A clear solution was obtained. Then add 88 mg Li 2 CO 3 And 300 mg oxalic acid, heated to 100 ° C for 24 hours, cooled to room temperature. The solution was poured onto a glass plate, dried in an oven at 70 °C, and the solvent was removed to obtain poly(vinyl alcohol-boric acid-lithium oxalate) with a thickness of 30 μm, whose structure is shown in Figure 1a , the ion-conducting group is similar to the structure of LiBOB.

[0044] (2) In the molten state, a porous polypropylene film with a thickness of 10 micrometers obtained by thermal stretching at 100 ° C, and then the polypropylene film is placed on the above and below the solid lithium polyborate film, and then heated to 70 ° C , Pressed at 10 atmospheres for 2 hours to obtain a solid polymer electrolyte composite membrane.

[0045] (3) After cutting th...

Embodiment 3

[0048] (1) Polyacrylic acid (PAA, Mw: 450000, 200 g), boric acid (148 g), and 20 ml of deionized water were heated to 80 °C to obtain a transparent solution. Next, 59 g of LiOH and 300 g of oxalic acid were added, heated to 100° C. for 24 hours, and cooled to room temperature. The solution was poured onto a glass plate, dried in an oven at 70°C, and the solvent was removed to obtain poly(acrylic acid-boric acid-lithium oxalate) with a thickness of 30 μm, whose structure is shown in Figure 1b , the ion-conducting group is similar to the structure of LiBOB.

[0049] (2) Dissolve P(VDF-HFP) in N-methyl-2-pyrrolidone at a mass percentage of 10%, and then pour the solution on the poly(acrylic acid-boric acid-lithium oxalate) obtained in the above (1) ) membrane surface, and then heated to 100° C., and vacuum-dried to obtain a solid polymer electrolyte composite membrane.

[0050] (3) After cutting the above composite film to an appropriate size, place it in a vacuum drying oven ...

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Abstract

The invention specifically relates to a composite gel polymer electrolyte and a preparation method and application thereof, belonging to the technical field of lithium ion batteries. The composite gel polymer electrolyte is composed of a composite electrolyte membrane and a liquid electrolyte, wherein the composite electrolyte membrane is composed of two or multiple layers, at least one of the layers is a solid polymer electrolyte capable of transferring lithium ions, and at least another of the layers is a high polymer material different from the solid polymer electrolyte. The composite gel polymer electrolyte provided by the invention has high conductivity, a great lithium ion migration coefficient and good safety performance and can be used for lithium secondary batteries with large capacity, high power and high-energy density.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite gel polymer electrolyte and its preparation method and application. Background technique [0002] As a new type of chemical power source, lithium secondary batteries, especially lithium-ion batteries, have the advantages of high energy density, environmental friendliness, and no memory effect. Since their commercialization, they have been widely used in notebook computers, digital cameras, mobile phones, etc. It is also one of the ideal energy storage devices for hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), pure electric vehicles (EV) and small smart grids. However, since LiPF 6 The wide application of organic electrolytes (sensitive to moisture, flammable, and explosive) makes the safety and reliability of large-capacity lithium-ion batteries questioned. In order to solve the safety problem of conventional lithi...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M2300/0082Y02E60/10
Inventor 朱玉松吴宇平郑健
Owner DKJ NEW ENERGY S & T CO LTD
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