A kind of solvated composite solid electrolyte and its preparation method and application

A solid electrolyte and solvation technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as inability to meet performance at the same time, achieve the effect of preventing excessive hardness and improving ionic conductivity

Active Publication Date: 2021-02-02
咸阳瞪羚谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, neither the organic solid electrolyte nor the inorganic solid electrolyte can satisfy all the above properties at the same time.

Method used

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  • A kind of solvated composite solid electrolyte and its preparation method and application
  • A kind of solvated composite solid electrolyte and its preparation method and application
  • A kind of solvated composite solid electrolyte and its preparation method and application

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preparation example Construction

[0038] The preparation process of the solvated composite solid electrolyte is as follows:

[0039] Step 1, using vinylidene fluoride-co-hexafluoropropylene and polyethylene oxide as the solute and dimethylformamide as the solvent to prepare vinylidene fluoride-co-hexafluoropropylene with a mass fraction of 5%-15% solution, and a polyethylene oxide solution with a mass fraction of 1%-5%; the two solutions are separately placed in an oven, baked at 50-70° C. for 6 hours, and then taken out to form a solution with uniform composition.

[0040] Step 2, the polyoxyethylene solution that step 1 obtains and Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (abbreviated as LAGP) mixed and stirred at 50-70 ° C, the mixed polyethylene oxide solution Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 Among them, the mass ratio of the solid content of the two is 1: (0.6-1.5); the stirring method is preferably magnetic stirring, and the stirring speed is 300r / min, and the mixed solution is obtained by stirring evenly; ...

Embodiment 1

[0052] (1) Using vinylidene fluoride-co-hexafluoropropylene and polyethylene oxide as the solute and dimethylformamide as the solvent, respectively prepare solutions with a mass fraction of 12% and 2.5%, and place them in an oven at 60°C , After baking for 6 hours, take it out to form a uniform solution, which is conducive to dissolution.

[0053] (2) Mix and stir the polyoxyethylene solution and the LAGP solution at 60°C, the mass ratio of the solid content is 1:1.5 to prepare a mixed solution; add vinylidene fluoride-co-hexafluoropropylene solution to the mixed solution , the solid content of the added vinylidene fluoride-co-hexafluoropropylene solution is 9 times the solid content of the polyethylene oxide solution, and after continuing to stir evenly, a uniform white emulsion is obtained, which is a mixture of three substances.

[0054] (3) Pour the white emulsion into a polytetrafluoroethylene mold, dry it at 25°C for 24 hours, and then dry it with air at 60°C for 4 hours...

Embodiment 2

[0064] (1) Prepare a 10% vinylidene fluoride-co-hexafluoropropylene solution and a 3% polyethylene oxide solution respectively, place them in an oven at 50° C., and take them out after baking for 6 hours to form a uniform solution.

[0065] (2) Mix and stir the polyoxyethylene solution and the LAGP solution at 60°C, the mass ratio of the solid content is 1:1.2 to prepare a mixed solution; add vinylidene fluoride-co-hexafluoropropylene solution to the mixed solution , the solid content of the added vinylidene fluoride-co-hexafluoropropylene solution is 9 times the solid content of the polyethylene oxide solution, and after continuing to stir evenly, a uniform white emulsion is obtained, which is a mixture of three substances.

[0066] (3) Pour the white emulsion into a polytetrafluoroethylene mold, dry it at 40°C for 12 hours, and then dry it with air at 60°C for 20 hours to obtain a composite solid electrolyte film;

[0067] (4) Preparation of solvated ionic liquid electrolyte, ...

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Abstract

The invention discloses a solvated composite solid electrolyte, a preparation method and application thereof. The method uses a solution casting method to prepare vinylidene fluoride-co-hexafluoropropylene as the main phase, doped with polyethylene oxide and Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 The composite solid electrolyte film, and then soak the composite solid electrolyte film in the solvated ionic liquid, and finally obtain the composite solid electrolyte. The composite solid electrolyte prepared by the invention has the same ion conductivity as the liquid electrolyte, good interface compatibility, certain mechanical strength, good electrochemical stability and good safety. The preparation process is simple and can be used in large-scale production. When applied to a lithium battery, a high-safety lithium battery can be constructed, and the cycle life and cycle performance of the battery can be guaranteed.

Description

【Technical field】 [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a solvated composite solid state electrolyte and a preparation method and application thereof. 【Background technique】 [0002] Most existing commercial lithium-ion batteries use organic electrolytes. Organic electrolytes have up to ~10 -2 S cm -1 Li-ion conductivity, which provides favorable conditions for Li-ion batteries to achieve high rate performance. However, organic electrolytes are prone to leakage during storage and use, and are at risk of combustion and explosion. In addition, lithium-ion batteries based on organic electrolytes can only provide limited energy density and power density (390Wh / kg), which cannot fully meet the energy needs of new energy vehicles. [0003] In order to fundamentally eliminate the safety hazards brought by organic electrolytes and achieve higher energy density and power density with metal lithium anodes, researchers have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0565
CPCY02E60/10
Inventor 宋江选刘桥熊仕昭宋忠孝刘洋洋
Owner 咸阳瞪羚谷新材料科技有限公司
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