A kind of hybrid polymer electrolyte, its preparation method and application

A polymer and electrolyte technology, used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve problems such as poor mechanical properties, avoid burning and breakage, good mechanical properties and flexibility, and excellent thermal stability. Effect

Active Publication Date: 2020-12-29
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a hybrid polymer. The POSS structure in the polymer electrolyte can endow the hybrid polymer electrolyte with better mechanical properties, and the PEGDMA structure endows the electrolyte with the function of conducting lithium ions. These two functions work at the same time, so that the polymer electrolyte can effectively overcome the disadvantages of poor mechanical properties of traditional polymer electrolytes compared with traditional polymer electrolytes, so as to avoid safety problems such as electrolyte combustion and fragmentation.

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  • A kind of hybrid polymer electrolyte, its preparation method and application
  • A kind of hybrid polymer electrolyte, its preparation method and application
  • A kind of hybrid polymer electrolyte, its preparation method and application

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preparation example Construction

[0073] Correspondingly, taking a lithium-ion battery as an example, the method for preparing a cross-linked hybrid polymer electrolyte includes the following steps:

[0074] 1, the synthesis of octamercapto polysilsesquioxane specifically comprises:

[0075] S1: Dissolving γ-mercaptopropyltrimethoxysilane in an organic solvent, adding acid, and stirring to reflux for reaction, standing still to obtain a reaction solution;

[0076] S2: Mix the reaction solution obtained in step S1 with a precipitating agent to form a precipitate, filter and dry to obtain octamercapto polysilsesquioxane;

[0077] II. Synthesis of crosslinking agent polyethylene glycol dimethacrylate:

[0078] S3: Dissolving polyethylene glycol in an organic solvent to obtain a polyethylene glycol solution, adding alkali and methacryloyl chloride to the polyethylene glycol solution, and reacting to obtain a colorless transparent solution;

[0079] S4: Mix the colorless transparent solution obtained in step S3 w...

Embodiment 1

[0106] A hybrid polymer electrolyte, including lithium salt, octamercapto polysilsesquioxane as the core, polyethylene glycol dimethacrylate PEGDMA 200 It is a cross-linked polymer composed of cross-linked arms.

[0107] The preparation method of the hybrid polymer electrolyte is as follows: 15.0ml of γ-mercaptopropyltrimethoxysilane and 30ml of concentrated hydrochloric acid were dissolved in 300mL of methanol solution. Under argon protection, with mechanical stirring, the reaction was refluxed at 50° C. for 5 days. After the reaction is over, let it stand still, and pour out the remaining reaction solution. The white viscous liquid was dissolved in tetrahydrofuran, precipitated with methanol, and dried in a vacuum oven at 50°C for 48 hours to obtain white crystals. After polyethylene glycol 200 is heated and melted, potassium carbonate, tetrahydrofuran and methacryloyl chloride are added to the molten polyethylene glycol, reacted at 0°C, and precipitated with ether to obta...

Embodiment 2

[0111] Octamercapto polysilsesquioxane-polyethylene glycol dimethacrylate PEGDMA 4000 hybrid polymer electrolytes.

[0112] The preparation method of the hybrid polymer electrolyte is as follows: 15.0ml of γ-mercaptopropyltrimethoxysilane and 30ml of concentrated hydrochloric acid are dissolved in 300ml of acetonitrile solution. Under argon protection, with mechanical stirring, the reaction was refluxed at 120° C. for 1 day. After the reaction is over, let it stand still, and pour out the remaining reaction solution. Dissolve the white viscous liquid with dichloromethane, precipitate methanol, and dry in a vacuum oven at 50°C for 48 hours to obtain white crystals. After heating and melting polyethylene glycol 4000, add potassium carbonate, tetrahydrofuran and methacryloyl chloride to the melted polyethylene glycol, react at 50°C, and precipitate from n-heptane to obtain polyethylene glycol dimethacrylate PEGDMA 4000 .

[0113] Put into 254mg octamercapto polysilsesquioxan...

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Abstract

The invention discloses a hybrid polymer electrolyte, which comprises a metal salt and a cross-linked polymer composed of octamercaptopolysilsesquioxane as the core and polyethylene glycol dimethacrylate as the cross-linking arm. The chemical structural formula of the polymer is as follows, n is an integer of 4-113. The invention also discloses a preparation method of a hybrid polymer electrolyte and the application of the hybrid polymer electrolyte. The hybrid polymer electrolyte is prepared based on ultraviolet light-triggered thiol-ene reaction, and the preparation method does not need to add photosensitizer agent. The combination of the POSS structure and the PEGDMA structure in the polymer electrolyte of the present invention enables the polymer electrolyte to effectively overcome the disadvantages of poor mechanical properties and low electrical conductivity of the traditional polymer electrolyte compared with the traditional polymer electrolyte.

Description

technical field [0001] The invention belongs to the technical field of polymer electrolytes, and more specifically relates to a hybrid polymer electrolyte, its preparation method and application. Background technique [0002] For metal ion batteries represented by lithium ion batteries, the electrolyte is one of the important factors affecting the performance of lithium ion batteries. At present, commercial lithium batteries are still dominated by liquid electrolytes, but a large amount of organic solvents in liquid electrolytes are flammable and explosive, which poses a severe challenge to the safety of lithium-ion batteries. Compared with liquid electrolytes, solid electrolytes have the advantages of high energy density and light weight. Inorganic solid-state electrolytes have high conductivity, but are hard and brittle, while polymer solid-state electrolytes can be rationally designed according to different requirements to obtain functionalized polymer electrolytes, but ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525C08G77/46
CPCC08G77/46H01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 薛志刚左偲陈功周兴平解孝林
Owner HUAZHONG UNIV OF SCI & TECH
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