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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  • Abstract
  • Description
  • Claims
  • Application Information

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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-

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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

Experimental program
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Example Embodiment

[0026] Example 1

[0027] (1) Combine polyethylene oxide (molecular weight 100,000), LiClO 4 , TiO 2 (Particle size 50nm) is weighed at a mass percentage of 8.7:1:0.3, heated to 120°C under stirring, to become a uniform solid solution, and then poured onto a stainless steel plate to a thickness of 10 microns The solid polymer electrolyte membrane is cooled to room temperature.

[0028] (2) In the molten state, a porous polyethylene film with a thickness of 10 microns is obtained by thermal stretching at 80°C, and then the polyethylene film is placed on the above solid polymer electrolyte membrane, and then heated to 60°C. It is pressed at 10 atmospheres for 1 hour to obtain a solid polymer electrolyte composite membrane.

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

Example Embodiment

[0042] Example 2

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

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

[0045] (3) After cutting the above-mentioned composite film...

Example Embodiment

[0047] Example 3

[0048] (1) Heat polyacrylic acid (PAA, Mw: 450000, 200 g), boric acid (148 g), and 20 ml deionized water to 80°C to obtain a transparent solution. Then, 59g LiOH and 300g oxalic acid were added, heated to 100°C to react for 24 hours, and cooled to room temperature. The solution was poured on 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 30μm. The structure is shown in Figure 1b , The ion-conducting group is similar in structure to LiBOB.

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

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

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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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