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Alkali-resistant dual-network hydrogel flexible electrolyte and preparation method and application thereof

A flexible electrolyte, dual network technology, applied in the direction of electrolyte immobilization/gelation, fuel cell-type half-cell and primary battery-type half-cell, circuits, etc., can solve the problem of poor stretchability, electrochemical performance and mechanical properties Problems such as poor flexibility and loss of mechanical strength, to achieve excellent flexibility, good cross-linking effect, and enhanced mechanical durability.

Active Publication Date: 2019-11-22
GUANGZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, PVA-based electrolytes suffer from very poor stretchability (even worse when alkaline electrolytes are infiltrated), while it shows limited ion transport capabilities, resulting in poor electrochemical performance and mechanical flexibility.
Although other hydrogels, such as polyacrylic acid (PAA), polyacrylamide (PAM), have strong water retention and high stretchability, they lose their mechanical strength when combined with strong alkaline electrolyte solutions, Especially stretchable

Method used

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  • Alkali-resistant dual-network hydrogel flexible electrolyte and preparation method and application thereof
  • Alkali-resistant dual-network hydrogel flexible electrolyte and preparation method and application thereof
  • Alkali-resistant dual-network hydrogel flexible electrolyte and preparation method and application thereof

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Embodiment 1

[0040] (1) Synthesis of water-based hexamethylene diisocyanate trimer (WHT)

[0041] In the synthesis of aqueous hexamethylene diisocyanate trimer, polyethylene glycol monomethyl ether 5g (molecular weight 750, Anaiji E080730) and hexamethylene diisocyanate trimer 5g (molecular weight 500, Shenzhen Zhibang ) for feeding, stirring and reacting at 75° C. for 12 hours to obtain aqueous hexamethylene diisocyanate trimer.

[0042] (2) Preparation of alkali-resistant double network hydrogel flexible hydrogel electrolyte

[0043] 50 microliters of hydrochloric acid (37%) was added to 25 g of deionized water, and the pH of the obtained hydrochloric acid aqueous solution was about 1. Add 0.1g of chitosan (deacetylation degree ≥ 95%, viscosity 100-200mpa.s) into hydrochloric acid aqueous solution and stir for 2h to clarify to obtain chitosan aqueous solution; mix 10g of acrylic acid with 15ml of aqueous solution containing 6g of sodium oxide Neutralization reaction to prepare sodium a...

Embodiment 2

[0050] (1) Synthesis of water-based hexamethylene diisocyanate trimer (WHT)

[0051] In the synthesis of water-based hexamethylene diisocyanate trimer, 5 g of polyethylene glycol monomethyl ether (molecular weight 2000) and 5 g of hexamethylene diisocyanate trimer (molecular weight 500) were fed, at 75 ° C The reaction was stirred for 12 hours to obtain aqueous hexamethylene diisocyanate trimer.

[0052] (2) Preparation of alkali-resistant double network hydrogel flexible hydrogel electrolyte

[0053] Add 50 microliters of hydrochloric acid (37%) to 25 g of deionized water, the pH of the aqueous hydrochloric acid solution is about 1, add 0.1 g of chitosan (deacetylation degree ≥ 95%, viscosity 100-200mpa.s) to the hydrochloric acid Stir in the aqueous solution for 2h to clarify to obtain the chitosan aqueous solution; 10g of acrylic acid and 15 milliliters of aqueous solution containing 6g sodium oxide are neutralized to obtain the sodium acrylate aqueous solution; then the s...

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Abstract

The invention belongs to the field of all-solid-state flexible batteries, and discloses an alkali-resistant dual-network hydrogel flexible electrolyte as well as a preparation method and application thereof. The preparation method of the alkali-resistant dual-network hydrogel flexible electrolyte comprises the following steps: uniformly mixing a sodium acrylate aqueous solution, a chitosan acidicaqueous solution, an initiator, N, N-methylene bisacrylamide and an aqueous hexamethylene diisocyanate tripolymer to form a free radical polymerization system, and carrying out free radical polymerization to obtain alkali-resistant dual-network hydrogel; and soaking the obtained alkali-resistant double-network hydrogel in an alkaline aqueous solution to obtain the alkali-resistant double-network hydrogel flexible electrolyte. The hydrogel permeated by a 6M KOH aqueous solution obtained according to the invention, as an electrolyte, still exhibits a stretchability of more than 500% and an ionicconductivity of 0.18 S.cm-1. And meanwhile, the prepared zinc-air battery shows excellent flexibility.

Description

technical field [0001] The invention belongs to the field of all-solid-state flexible batteries, and in particular relates to an alkali-resistant double network hydrogel flexible electrolyte and its preparation method and application. Background technique [0002] Fully flexible electronic devices can be conveniently worn on various parts of the human body to achieve better integration with the human body. However, at present, many flexible devices such as folding screen mobile phones still use ordinary rigid batteries, avoiding the problem of using flexible batteries. In order to realize fully flexible electronic devices in the true sense, it is necessary to develop corresponding flexible power sources and implant them. Therefore, the development of flexible batteries with high energy density will be of great significance to promote the development of wearable and flexible electronic devices. At present, all-solid-state flexible water-based batteries have received unprece...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M12/06C08J3/075C08J3/24C08L33/02C08L5/08C08L75/08C08F220/06C08F222/38
CPCC08F220/06C08J3/075C08J3/246C08J2333/02C08J2405/08C08J2475/08H01M10/0565H01M12/06H01M2300/0085C08F222/385Y02E60/10
Inventor 吴旭陈睿徐秀彬于丹凤彭思玉毛桃嫣
Owner GUANGZHOU UNIVERSITY
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