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Polymer electrolyte based on boric acid ester exchange reaction as well as preparation method and application of polymer electrolyte

An exchange reaction and polymer technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., to achieve the effects of promoting lithium salt dissociation, enhancing exercise capacity, and improving conductivity

Active Publication Date: 2022-08-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrolyte still contains electrolyte, which does not fundamentally solve the safety risk of lithium-ion batteries

Method used

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  • Polymer electrolyte based on boric acid ester exchange reaction as well as preparation method and application of polymer electrolyte
  • Polymer electrolyte based on boric acid ester exchange reaction as well as preparation method and application of polymer electrolyte
  • Polymer electrolyte based on boric acid ester exchange reaction as well as preparation method and application of polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation method of the conductivity-enhanced polymer electrolyte based on borate exchange provided in this embodiment is as follows;

[0044] S1: 1.425g polyethylene glycol methyl ether methacrylate with an average molecular weight of 475 ( n=9, the manufacturer is Aladdin Reagent Company) and 0.48g 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester, 16.74mg dithiobenzoic acid 4-cyanovaleric acid, 3.28mg azo Diisobutyronitrile, dissolved in 5 mL of tetrahydrofuran, removed the oxygen in the reaction flask, heated to 60 °C for 24 hours, precipitated the reacted solution in ether, and used an oil pump to remove the ether to obtain the main chain of the copolymer;

[0045] S2: 0.75g of 2-formylbenzeneboronic acid ( Belonging to formyl phenylboronic acid PBA) with 10.35g M 2070 (ie, polyetheramine M 2070 ) in 20 mL of ethanol solvent at 30 °C for 24 h, and the solvent was removed by rotary evaporation to obtain PBA M 2070 ;

[0046] S3: Take 0.16 g of the copol...

Embodiment 2

[0052] This embodiment provides a polymer electrolyte with enhanced conductivity based on a boronate exchange reaction and a preparation method thereof is as follows;

[0053] S1: 1.425g polyethylene glycol methyl ether methacrylate with an average molecular weight of 475 ( n=9, the manufacturer is Aladdin Reagent Company) and 0.48g 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester, 16.74mg dithiobenzoic acid 4-cyanovaleric acid, 3.28mg azo Diisobutyronitrile, dissolved in 5 mL of tetrahydrofuran, removed the oxygen in the reaction flask, heated to 60 °C for 24 hours, precipitated the reacted solution in ether, and used an oil pump to remove the ether to obtain the main chain of the copolymer;

[0054] S2: 0.75g of 2-formylphenylboronic acid with 10.35g M 2070 The reaction was carried out in 20 mL of ethanol solvent at 30 °C for 24 h, and the solvent was removed by rotary evaporation to obtain PBA M 2070 ;

[0055] S3: Take 0.16 g of the copolymerized backbone obtained i...

Embodiment 3

[0057] This embodiment provides a polymer electrolyte with enhanced conductivity based on a boronate exchange reaction and a preparation method thereof is as follows;

[0058] S1: 1.425g polyethylene glycol methyl ether methacrylate with an average molecular weight of 475 ( n=9, the manufacturer is Aladdin Reagent Company) and 0.48g 2-methyl-2-acrylic acid-2,3-dihydroxypropyl ester, 16.74mg dithiobenzoic acid 4-cyanovaleric acid, 3.28mg azo Diisobutyronitrile, dissolved in 5 mL of dichloromethane, removed the oxygen in the reaction flask, heated to 60 °C for 24 h, precipitated the reacted solution in diethyl ether, and used an oil pump to remove the diethyl ether to obtain the copolymer;

[0059] S2: Take 0.16 g of the copolymer containing polyethylene glycol methyl ether methacrylate and 2-methyl-2-acrylic acid-2,3-dihydroxypropyl obtained in step S1, add 0.016 g of bis-trifluoromethanesulfonyl Lithium imide, according to the lithium salt accounting for 10% of the polymer m...

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Abstract

The invention belongs to the technical field of polymer electrolytes, and discloses a polymer electrolyte based on boric acid ester exchange reaction and a preparation method and application thereof.The polymer electrolyte comprises a main chain component, a side chain component and a lithium salt component, a side chain of the copolymer is a polyethylene glycol-polypropylene glycol boric acid side chain, and the polyethylene glycol-polypropylene glycol boric acid side chain can be subjected to reversible exchange reaction with two adjacent hydroxyl groups in a main chain of the copolymer; by utilizing the side chain, the movement capability of the chain segment in the polymer electrolyte can be improved, so that the conductivity of the polymer electrolyte is improved. According to the invention, the dynamic exchange reaction between boric acid ester and two adjacent hydroxyl groups on a main chain is utilized, so that the movement capability of a chain segment in the polymer electrolyte is improved, and the complexing and dissociation processes of a polyoxyethylene chain segment and lithium ions are accelerated, so that the ionic conductivity of the electrolyte is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of polymer electrolytes, and more particularly, relates to a polymer electrolyte based on borate exchange reaction, its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used in mobile electronic devices and electric vehicles due to their advantages of high capacity, long cycle life, high output voltage and no memory effect. Commercial lithium-ion batteries generally use organic carbonate compounds such as ethylene carbonate, dimethyl carbonate, etc. as electrolyte materials, which are prone to electrolyte leakage, resulting in battery fire, explosion and other safety hazards. In order to solve this problem, solid-state polymer electrolytes have emerged as the times require. Their excellent thermal stability and processability can effectively improve the safety of lithium-ion batteries, and have increasingly become an ideal electrolyte for power lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0564H01M10/0525
CPCH01M10/0564H01M10/058H01M10/0525H01M2300/0082Y02P70/50Y02E60/10
Inventor 薛志刚王鸿力石振黄英杰周兴平解孝林
Owner HUAZHONG UNIV OF SCI & TECH
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