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Solid polymer electrolyte-based composite gel 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, high production cost, and difficulty in wide application, and achieve good cycle performance, low production cost, and wide electrochemical window Effect

Inactive Publication Date: 2017-05-10
DKJ NEW ENERGY S & T CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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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  • Solid polymer electrolyte-based composite gel polymer electrolyte and preparation method and application thereof
  • Solid polymer electrolyte-based composite gel polymer electrolyte and preparation method and application thereof
  • Solid polymer electrolyte-based composite gel polymer electrolyte and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Polyethylene oxide (molecular weight: 100,000), LiClO 4 、TiO 2 (Particle size 50nm) Weigh according to the ratio of mass percentage of 8.7:1:0.3, heat to 120°C under stirring, turn into a uniform solid solution, then cast it on a stainless steel plate, press it to a thickness of 10 microns solid polymer electrolyte membrane and cooled to room temperature.

[0029] (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 the above-mentioned solid polymer electrolyte membrane, and then heated to 60° C. Pressing under 10 atmospheres for 1 hour to obtain a solid polymer electrolyte composite membrane.

[0030] (3) After cutting the above-mentioned composite film into an appropriate size, place it in a vacuum drying oven at 80°C for 24 hours to dry to remove trace moisture, cool it to room temperature in vacuum, and transfer it into an anhydrous and oxygen-free glove box. Then the solid ...

Embodiment 2

[0043] (1) Dissolve polyvinyl alcohol (PVA, alcoholysis degree ≥ 98%, Mw: 105000, 200mg) and boric acid (148mg) in 20ml dimethylsulfoxide DMSO, then heat at 80°C for 8 hours to obtain a transparent solution. Then add 88mg Li 2 CO 3 And 300mg of 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 1 a, 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 polylithium borate 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 cutt...

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. Then add 59g LiOH and 300g oxalic acid, heat to 100°C for 24 hours, and cool 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 1 b, The ion-conducting group is similar to the structure of LiBOB.

[0049] (2) P(VDF-HFP) is dissolved in N-methyl-2-pyrrolidone in a ratio of 10% by mass, and then the solution is poured 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 membrane into an appropriate size, place it in a vacuum drying oven at 80° C....

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Abstract

The invention belongs to the technical field of a lithium ion battery, and specifically relates to a composite gel polymer electrolyte and a preparation method and an application thereof. The composite gel polymer electrolyte consists of a composite electrolyte film and a liquid electrolyte, wherein the composite electrolyte film comprises two or more layers; at least one layer of the composite electrolyte film is solid polymer electrolyte capable of transferring lithium ions; and at least one layer of the composite electrolyte film is a high molecular material different from the solid polymer electrolyte. The composite gel polymer electrolyte is high in conductivity, high in lithium ion transport coefficient, high in safety and can be applied to a high-capacity, high-power and high-energy-density lithium secondary battery.

Description

[0001] This application is a divisional application of the patent application with the application number 201310025675.7, the application date is January 23, 2013, and the invention title is "composite gel polymer electrolyte based on solid polymer electrolyte and its preparation method and application". technical field [0002] 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 [0003] 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 e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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