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Low-temperature-resistant self-healing hydrogel electrolyte as well as preparation method and application thereof

An electrolyte and hydrogel technology, which is applied in the low temperature resistant self-healing hydrogel electrolyte and its preparation and application fields, can solve the problems of easy icing, decreased characteristics of supercapacitors, and is not easy to recover automatically, and achieves good low temperature resistance and The effect of self-healing performance and high ionic conductivity

Inactive Publication Date: 2021-09-07
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, hydrogels are usually prone to freezing at low temperatures and are not easy to recover automatically under physical damage, which makes the characteristics of supercapacitors drop sharply.

Method used

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  • Low-temperature-resistant self-healing hydrogel electrolyte as well as preparation method and application thereof
  • Low-temperature-resistant self-healing hydrogel electrolyte as well as preparation method and application thereof
  • Low-temperature-resistant self-healing hydrogel electrolyte as well as preparation method and application thereof

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preparation example Construction

[0031] A method for preparing the low temperature resistant self-healing hydrogel electrolyte as described above, the raw materials of the electrolyte include organic polymer monomers, thickeners, crosslinking agents, pour point depressants, metal ion salt solutions and activators; wherein , the mass ratio of the organic polymer monomer, the thickener and the activator is (2-4):(2-4):(2-4), and the electrolyte is used in a supercapacitor. The preparation method comprises the following steps:

[0032] (1) Mix polymer monomers, thickeners, activators and pour point depressants for reaction;

[0033] Specifically, the thickener includes one or more of sodium alginate, polyvinyl alcohol or agar; the organic polymer monomer is one or more of ortho-phenolic compounds and their derivatives, and the structure is as follows:

[0034]

[0035] in,

[0036] R 1 The group is selected from a hydrogen atom, an alkyl group, a cycloalkyl group or an aryl group;

[0037] R 2 The groups...

Embodiment 1

[0044] A method for preparing a low temperature resistant self-healing hydrogel electrolyte, comprising the following steps:

[0045] (1) 2g sodium alginate and 2g dopamine are dissolved in 200ml volume fraction of 40% propylene glycol aqueous solution;

[0046] (2) Then 2g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and 2g of N-hydroxysuccinimide (NHS) were mixed and added to In the aqueous solution in step (1), use nitrogen (N 2 ) bubbling to make it react fully obtained sodium alginate dopamine salt solution;

[0047] (3) 0.24g potassium dihydrogen phosphate (KH 2 PO 4 ), 1.44g disodium hydrogen phosphate (Na 2 HPO 4 ), 8g of sodium chloride (NaCl) and 0.2g of potassium chloride (KCl) were dissolved in 800ml of deionized water, and concentrated hydrochloric acid was added to adjust the pH to 4.5 to obtain a PBS buffer solution;

[0048] (4) The sodium alginate dopamine salt solution obtained in step (2) was dialyzed in PBS buffer solution for ...

Embodiment 2

[0054] A method for preparing a low temperature resistant self-healing hydrogel electrolyte, comprising the following steps:

[0055] (1) 2g sodium alginate and 2g dopamine are dissolved in 200ml volume fraction of 40% propylene glycol aqueous solution;

[0056](2) Then 2g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and 2g of N-hydroxysuccinimide (NHS) were mixed and added to In the aqueous solution in step (1), use nitrogen (N 2 ) bubbling to make it react fully obtained sodium alginate dopamine salt solution;

[0057] (3) 0.24g potassium dihydrogen phosphate (KH 2 PO 4 ), 1.44g disodium hydrogen phosphate (Na 2 HPO 4 ), 8g of sodium chloride (NaCl) and 0.2g of potassium chloride (KCl) were dissolved in 800ml of deionized water, and concentrated hydrochloric acid was added to adjust the pH to 4.5 to obtain a PBS buffer solution;

[0058] (4) The sodium alginate dopamine salt solution obtained in step (2) was dialyzed in PBS buffer solution for 2...

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Abstract

The invention relates to a low-temperature-resistant self-healing hydrogel electrolyte as well as a preparation method and application thereof. The electrolyte is prepared from the following raw materials: an organic polymer monomer, a thickening agent, a cross-linking agent, a pour point depressant, a metal ion salt solution and an activating agent, the mass ratio of the organic polymer monomer to the thickening agent to the activating agent is (2-4): (2-4): (2-4). The preparation method comprises the following steps: (1) mixing the polymer monomer, the thickening agent, the activating agent and the pour point depressant for reaction; (2) placing the reactant in a PBS buffer solution with the pH value of 4.5-7.5 for dialysis, and then freeze-drying to obtain a grafted solid; and (3) dissolving the grafted solid in a metal ion salt solution, and slowly adding a cross-linking agent for cross-linking reaction to obtain the low-temperature-resistant self-healing hydrogel electrolyte. Compared with the prior art, the invention has the advantages of difficult freezing at low temperature, good conductivity, self-healing in damage and the like.

Description

technical field [0001] The invention relates to the field, in particular to a low temperature resistant self-healing hydrogel electrolyte and its preparation method and application. Background technique [0002] With the characteristics of low energy density, high power density, and long cycle life, supercapacitors are ideal for meeting high-power pulse requirements and have attracted great attention. Conventional supercapacitors usually consist of two electrodes and a liquid electrolyte. Supercapacitors with liquid electrolytes have disadvantages such as liquid leakage, self-discharge, electrode corrosion, large volume, low-temperature operation, and difficulty in designing different shapes, which hinder their application in portable microelectronic devices. Hydrogel electrolytes that combine polymers and liquid electrolytes into a homogeneous gel phase will exhibit higher ionic conductivity and more stable electrochemical properties. [0003] Hydrogel uses water as the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/56H01G11/84C08J3/075C08J3/24C08L5/04
CPCH01G11/56H01G11/84C08J3/075C08J3/24Y02E60/13
Inventor 菅泽黄锐张君韩生
Owner SHANGHAI INST OF TECH
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