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Composite solid electrolyte membrane, and preparation method and application thereof

A solid electrolyte membrane, sulfide electrolyte technology, applied in non-aqueous electrolyte batteries, circuits, electrical components, etc., can solve the problems of low strength and room temperature ionic conductivity, poor toughness, etc., to achieve high energy density and safety performance, flexibility Good, good thermal stability

Pending Publication Date: 2019-05-28
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims to propose a method for preparing a composite solid electrolyte membrane to solve the problems of poor toughness, strength and low room temperature ionic conductivity of the existing solid electrolyte membrane

Method used

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  • Composite solid electrolyte membrane, and preparation method and application thereof
  • Composite solid electrolyte membrane, and preparation method and application thereof
  • Composite solid electrolyte membrane, and preparation method and application thereof

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preparation example Construction

[0038] The method for preparing a composite solid electrolyte membrane according to one aspect of the present invention comprises:

[0039] S100: mixing organic solvent and binder

[0040] According to some embodiments of the present invention, the organic solvent and the binder are mixed to obtain a mixed glue solution, wherein the organic solvent is selected from dichloromethane, tetrahydrofuran, n-hexane, n-heptane, toluene, 2,4-bis At least one of methyl-3-pentanone, monochlorobenzene, xylene, anisole, cyclohexanone, 1,3,5-trimethylbenzene, n-decane, and methylformamide. The inventors have found that the above solvents can dissolve a variety of sulfide-stable binders, these solvents have moderate boiling points, and the residual moisture can be removed to less than 10ppm within 24 hours. After mixing for more than 24 hours, the conductivity remains between 50% and 100%, indicating that it is stable to sulfide electrolytes. These solvents mainly belong to ketones, ethers, ...

Embodiment 1

[0056] (1) Dichloromethane and PVDF5130 (molecular weight: 200,000) are mixed to make glue according to the mass ratio of 25:1 to obtain a mixed glue;

[0057] (2) Combine the mixed glue with Li 10 SnP 2 S 12 According to the mass ratio of 1.2:1, mixing and pulping to obtain mixed slurry;

[0058] (3) The mixed slurry is coated on the PP-PE composite film (its microstructure is as follows) according to the solid-liquid ratio of 130:1 figure 2 Shown) on the surface of the composite solid electrolyte membrane (the SEM image of its cross-section is shown in image 3 As shown, the surface SEM image is shown in Figure 4 As shown, the optical photo is as Figure 5 shown).

Embodiment 2

[0060] (1) tetrahydrofuran and PEO (molecular weight: 550,000) are mixed to make glue according to the mass ratio of 22:1 to obtain mixed glue;

[0061] (2) Combine the mixed glue with Li 10 GeP 2 S 12 According to the mass ratio of 1.2:1 mixed pulping, to obtain mixed slurry;

[0062] (3) The mixed slurry is coated on the surface of the PAN membrane according to the solid-to-liquid ratio of 140:1 to obtain a composite solid electrolyte membrane (the surface structure of which is shown in Figure 6 As shown, the optical photo is as Figure 7 shown).

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Abstract

The invention discloses a composite solid electrolyte membrane as well as a preparation method and application thereof. The preparation method of the composite solid electrolyte membrane comprises thefollowing steps: (1) mixing an organic solvent and a binder to obtain a mixed glue solution; (2) mixing the mixed glue solution with sulfide electrolyte to prepare slurry so as to obtain mixed slurry; and (3) forming the mixed slurry on at least one part of the base membrane to obtain the composite solid electrolyte membrane. In the step (1), the organic solvent is selected from at least one of dichloromethane, tetrahydrofuran, n-hexane, n-heptane, methylbenzene, 2,4-dimethyl-3-pentanone, chlorobenzene, xylene, anisole, cyclohexanone, and 1,3,5-trimethylbenzene, n-decane and methyl formamide.The composite solid electrolyte membrane obtained by the method disclosed by the invention has the advantages of good flexibility, high strength, good toughness, high ionic conductivity and good thermal stability.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a composite solid electrolyte membrane and its preparation method and application. Background technique [0002] Among many battery systems, lithium batteries have become the main force in energy storage and conversion systems due to their high energy density, no memory effect and relatively good environmental friendliness. As people's requirements for the energy density and safety performance of lithium batteries are increasing, solid-state lithium batteries will become the first choice for a new generation of high energy density and high safety batteries. One of the key technologies in solid-state batteries is solid-state electrolyte diaphragm technology. The quality of the diaphragm directly affects the energy density, safety, rate performance and high and low temperature performance of the battery. [0003] Solid electrolytes are divided into three categories: oxid...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/052
CPCY02E60/10
Inventor 王磊梭楚姆·乔伊库马尔吕文彬郑晓醒周龙捷
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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