Boric acid ester cross-linked self-repairing polymer electrolyte and preparation method and application thereof

A self-healing, polymer technology, used in circuits, electrical components, secondary batteries, etc., can solve the problems of low electrochemical performance and poor stability of solid electrolytes

Pending Publication Date: 2022-08-02
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low electrochemical performance and poor stability...

Method used

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  • Boric acid ester cross-linked self-repairing polymer electrolyte and preparation method and application thereof
  • Boric acid ester cross-linked self-repairing polymer electrolyte and preparation method and application thereof
  • Boric acid ester cross-linked self-repairing polymer electrolyte and preparation method and application thereof

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preparation example Construction

[0029] The invention provides a preparation method of a borate cross-linked self-repairing polymer electrolyte, comprising the following steps:

[0030] (1) mixing polyethylene glycol methyl ether methacrylate, 2,3-dihydroxypropyl methacrylate, a boric acid-containing crosslinking agent, a lithium salt, a photoinitiator and an organic solvent to obtain a mixed solution;

[0031] (2) Casting the mixed solution obtained in the step (1) into a mold, and then performing light curing to obtain a borate cross-linked self-healing polymer electrolyte.

[0032] In the present invention, unless otherwise specified, the raw materials used are conventional commercially available products in the field.

[0033] In the present invention, polyethylene glycol methyl ether methacrylate, 2,3-dihydroxypropyl methacrylate, a boric acid-containing crosslinking agent, a lithium salt, a photoinitiator and an organic solvent are mixed to obtain a mixed solution.

[0034] The source of 2,3-dihydroxyp...

Embodiment 1

[0058] One, the preparation method of 2,3-dihydroxypropyl methacrylate

[0059] 50mmol of glycidyl methacrylate GMA and 80mL of ultrapure water were added to a 250mL flask, mixed and stirred for 1 hour, the solution became turbid, then heated to 80 ° C and carried out hydrolysis reaction for 24 hours, the two-phase system was transformed into a colorless transparent solution (homogeneous phase). ), the product of the hydrolysis reaction was rotary evaporated at 80°C for 30min to obtain 2,3-dihydroxypropyl methacrylate (HGMA);

[0060] The volume ratio of the glycidyl methacrylate and ultrapure water is 0.08:1.

[0061] 2. Preparation method of borate cross-linked self-healing polymer electrolyte

[0062] (1) Polyethylene glycol methyl ether methacrylate (1.00 g, 2 mmol), 2,3-dihydroxypropyl methacrylate (0.32 g, 2 mmol) prepared by the above method, and a cross-linking agent containing boric acid were added to Phenyldiboronic acid (0.083 g, 0.5 mmol), lithium salt lithium pe...

Embodiment 2

[0068] Prepare borate cross-linked self-healing polymer electrolyte according to the method of Example 1;

[0069] The difference from Example 1 is that in the step (1), lithium salt lithium perchlorate (0.08g, 0.76mmol) is used, and in the polyethylene glycol segment in the polyethylene glycol methyl ether methacrylate, The ratio of the amount of oxygen atoms to lithium atoms in the lithium salt (i.e. [O] / [Li + ] ratio) is 24:1.

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Abstract

The invention provides a preparation method of a boric acid ester cross-linked self-repairing polymer electrolyte, polyethylene glycol methyl ether methacrylate is selected as a monomer, crystallization is effectively inhibited, the electrochemical performance is improved, boric acid on a cross-linking agent structure containing boric acid is subjected to a condensation reaction to form boric acid ester, vacant p-orbit boron is introduced, and the self-repairing polymer electrolyte is prepared. Lithium ion conduction can be accelerated, a B-O covalent bond can be re-established through an ester exchange reaction of a dynamic boron ester bond, the polymer electrolyte has self-repairing capability, and the cross-linking density of a polymer chain segment can be effectively regulated and controlled by utilizing a cross-linking agent containing boric acid, so that the structure is regulated and controlled; the flexible, efficient, safe and stable boric acid ester cross-linked self-repairing polymer electrolyte is obtained. The polymer electrolyte prepared by the invention is amorphous, has a higher decomposition temperature, a glass transition temperature close to-45 DEG C and a potential stability window of 5.5 V or more, can be self-repaired after being cut and fused into a whole, and has good self-repairing property.

Description

technical field [0001] The invention relates to the field of electrolyte materials, in particular to a borate cross-linked self-repairing polymer electrolyte and a preparation method and application thereof. Background technique [0002] Commercial Li-ion batteries mainly use organic carbonate liquids as electrolytes, which are highly flammable and form dendrites, resulting in mobile phones assembled from Li-ion batteries prepared from organic carbonate liquids as electrolytes. , notebook computers, electric vehicles, etc., there is a danger of explosion, which constitutes a safety hazard. Therefore, the development of high-safety batteries has become particularly important and urgent. [0003] Recent studies have shown that replacing liquid electrolytes with solid electrolytes offers an opportunity to construct safer LMBs. The low electrochemical performance and poor stability of solid-state electrolytes hinder its commercial application. Therefore, how to prepare a soli...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0082Y02P70/50
Inventor 童永芬万龙李文文邱越宇周丹
Owner NANCHANG HANGKONG UNIVERSITY
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