Self-repairing solid electrolyte, preparation method and application thereof

A solid-state electrolyte and self-repairing technology, which is applied in the direction of solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., can solve the problems of poor stability and low applicability of solid-state batteries, and achieve simple preparation process, low cost and easy availability, Process green effect

Active Publication Date: 2021-04-13
WUHAN UNIV OF TECH
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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 self-healing solid electrolyte and its preparation method and application to solve the problems of poor stability and low applicability of energy storage and release of solid-state batteries in extreme environments

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  • Self-repairing solid electrolyte, preparation method and application thereof
  • Self-repairing solid electrolyte, preparation method and application thereof
  • Self-repairing solid electrolyte, preparation method and application thereof

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preparation example Construction

[0040] In order to solve the above problems, combined with figure 1 , Figure 6 As shown, the embodiment of the present invention provides a method for preparing a self-healing solid electrolyte, and the specific steps are:

[0041] S1, mixing the dissociated lithium salt compound with a solvent, and ultrasonically obtaining a dissociated solution;

[0042] S2. Add the self-healing polymer, cross-linking agent, and lithium salt into the dissociation solution, mix evenly, and heat up to react to obtain a self-healing precursor solution;

[0043] S3. Put the self-healing precursor solution on a polytetrafluoroethylene plate to form a film, and dry it in vacuum to obtain a self-healing solid electrolyte.

[0044] Specifically, in step S1, the dissociated lithium salt compound includes polyethylene glycol, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene, polyethylene oxide, polypropylene oxide, polypropylene carbonate, poly( At least one of ethylene glycol)...

Embodiment 1

[0060] This embodiment provides a method for preparing a self-healing solid electrolyte, and the specific steps are as follows:

[0061] 1) Preparation of dissociation solution

[0062] 2 g of polyvinylidene fluoride and N-N dimethylformamide (treated with molecular sieves) were uniformly mixed to obtain a dissociation solution.

[0063] 2) Preparation of self-healing precursor solution

[0064] Add 4g of DL-α-lipoic acid, 0.4g of 1,3-diisopropenylbenzene and 0.2g of polyethylene glycol diacrylate to the above dissociation solution, react and stir at 75°C for 10 minutes, then Add 10 mg of anhydrous ferric chloride, and continue heating for a period of time until the anhydrous ferric chloride is completely dissolved in the solution; after cooling to room temperature, add 0.2 g of lithium perchlorate, and stir for 12 hours to obtain a self-repairing precursor solution.

[0065] 3) Preparation of self-healing solid electrolyte

[0066] The self-healing precursor solution was p...

Embodiment 2

[0068] The difference between this embodiment and Embodiment 1 is that this embodiment provides a method for preparing a self-healing solid electrolyte, and the specific steps are as follows:

[0069] 1) Preparation of dissociation solution

[0070] Mix 3 g of polyvinylidene fluoride-hexafluoropropylene and acetonitrile evenly to obtain a dissociation solution.

[0071] 2) Preparation of self-healing precursor solution

[0072] Dissolve 188 mg of lithium bistrifluoromethylsulfonylimide in 812 mg of 1-allyl-3-vinylimidazole bistrifluoromethylsulfonimide salt, stir for 2 hours, and form a lithium salt mixture.

[0073] Add 6g of DL-α-lipoic acid and 1g of lithium salt mixture into the dissociation solution, stir evenly, and after heating at 75°C for 10 minutes, inject 1.2g of 1,3-diisopropenylbenzene and 15mg of Anhydrous ferric chloride was continued to be heated at 75° C. for 30 minutes to obtain a self-repairing precursor solution.

[0074] 3) Preparation of self-healing s...

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Abstract

The invention provides a self-repairing solid electrolyte, a preparation method and application thereof. The preparation method comprises the following specific steps: S1, mixing a dissociated lithium salt compound with a solvent, and carrying out ultrasonic treatment to obtain a dissociation solution; S2, adding a self-repairing polymer, a cross-linking agent and a lithium salt into the dissociation liquid, uniformly mixing, and heating for reaction to obtain a self-repairing precursor solution; and S3, putting the self-repairing precursor solution into a polytetrafluoroethylene plate for film preparation, and performing vacuum drying to obtain the self-repairing solid electrolyte. The preparation process of the self-repairing solid electrolyte is simple, the cost is low and easy to obtain, the process is green and environment-friendly, and the prepared self-repairing solid electrolyte has stable self-repairing performance and excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of solid-state batteries, in particular to a self-healing solid-state electrolyte and its preparation method and application. Background technique [0002] Lithium-ion batteries are rapidly developing in the fields of portable electronic devices, electric vehicles, and energy storage power systems, and gradually occupy a dominant position in the energy storage market. At present, the liquid electrolyte has an absolute advantage in the commercial lithium-ion battery electrolyte market due to its high ionic conductivity and excellent wettability, but there are many problems in the liquid electrolyte, including the reaction between the electrode and the electrolyte, which is inevitable The growth of lithium dendrites, unstable solid electrolyte (SEI), and the flammability of commercial electrolytes and the penetration of lithium dendrites into the separator have important impacts on the safety of batteries. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052C08L27/16C08L71/02C08J5/18
CPCC08J5/18C08J2327/16C08J2471/02H01M10/052H01M10/0565H01M2300/0082Y02E60/10
Inventor 徐林左旭日麦立强
Owner WUHAN UNIV OF TECH
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