Double-network lignin hydrogel as well as preparation method and application thereof

A lignin and hydrogel technology, applied in the direction of hybrid capacitor electrolyte, etc., can solve the problems of poor mechanical properties and insufficient flexibility, and achieve good charge-discharge cycle stability, high rate performance, and simple preparation methods.

Active Publication Date: 2019-03-26
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many reports on lignin hydrogels, their applications are limited due to the poor mechanical properties of lignin hydrogels prepared by current technologies and cannot meet the requirements of flexible, solid-state supercapacitor electrolytes.

Method used

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  • Double-network lignin hydrogel as well as preparation method and application thereof
  • Double-network lignin hydrogel as well as preparation method and application thereof
  • Double-network lignin hydrogel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Preparation of the first network lignin hydrogel (N-LP 0.6)

[0045] The lignin was selected as enzymatic lignin derived from corn stalks (Shandong Longli Biotechnology Co., Ltd.), and the cross-linking agent was selected as polyethylene glycol diglycidyl ether (PEGDGE, Mn=500) (purchased from Sigma). Weigh 5g of enzymatic lignin and fully dissolve it in 20mL of 1mol / L NaOH solution, then add 3g of PEGDGE to the above solution according to the mass ratio of lignin to PEGDGE of 1:0.6 and fully dissolve it, then put it in an oven at 50°C The reaction was cured for 2 hours to obtain the first network lignin hydrogel (N-LP 0.6).

Embodiment 2

[0046] Example 2: Preparation of the first network lignin hydrogel (N-LP 0.8)

[0047] The lignin was selected as enzymatic lignin derived from corn stalks (Shandong Longli Biotechnology Co., Ltd.), and the cross-linking agent was selected as polyethylene glycol diglycidyl ether (PEGDGE, Mn=500) (purchased from Sigma). Weigh 5g of enzymatic lignin and fully dissolve it in 20mL of 1mol / L NaOH solution, then add 4g of PEGDGE to the above solution according to the mass ratio of lignin to PEGDGE of 1:0.8 and fully dissolve it, then put it in an oven at 50°C The reaction was cured for 2 hours to obtain the first network lignin hydrogel (N-LP 0.8).

Embodiment 3

[0048] Example 3: Preparation of the first network lignin hydrogel (N-LP 1.0)

[0049] The lignin was selected as enzymatic lignin derived from corn stalks (Shandong Longli Biotechnology Co., Ltd.), and the cross-linking agent was selected as polyethylene glycol diglycidyl ether (PEGDGE, Mn=500) (purchased from Sigma). Weigh 5g of enzymatic lignin and fully dissolve it in 20mL of 1mol / L NaOH solution, then add 5g of PEGDGE to the above solution according to the mass ratio of lignin to PEGDGE of 1:1.0 and fully dissolve it, then put it in an oven at 50°C The reaction was cured for 2 hours to obtain the first network lignin hydrogel (N-LP 1.0).

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Abstract

The invention belongs to the field of lignin-based hydrogel functional materials and discloses double-network lignin hydrogel as well as a preparation method and application thereof. The preparation method disclosed by the invention comprises the following steps: constructing a first network lignin hydrogel system in an alkaline solution by virtue of chemical cross-linking, and soaking the first network lignin hydrogel in an acidic solution, and producing a hydrophobic effect by utilizing lignin in the first network, thereby forming the double-network lignin hydrogel. The double-network ligninhydrogel prepared by the method has high mechanical strength, and the preparation method is simple, low in raw material cost, reproducible, green and environment-friendly. Moreover, the double-network lignin hydrogel has high ionic conductivity, and when the hydrogel serves as electrolyte for assembling a supercapacitor, extra ionic solution soaking is not needed, use of an extra diaphragm is notneeded, and the thickness and weight of the supercapacitor are effectively reduced. The specific capacitance value of the obtained capacitor is higher than the specific capacitance value of a conventional hydrogel electrolyte type flexible supercapacitor. In addition, the double-network lignin hydrogel has excellent charge and discharge cycle stability, compression resistance and bending resistance.

Description

technical field [0001] The invention belongs to the field of lignin-based hydrogel functional materials, in particular to a double-network lignin hydrogel and its preparation method and application. Background technique [0002] With the depletion of fossil fuels and the seriousness of environmental pollution, people pay more and more attention to green and sustainable alternative energy sources. Among them, supercapacitors are widely used because of their fast charge and discharge, high power density and long service life. Attention, especially flexible and solid supercapacitors show good application prospects in the field of wearable devices (Chen, W., et al. Chemical Society Reviews 2018, 47(8), 2837-2872.). Solid-state supercapacitors use solid or semi-solid gel or polymer membranes as electrolytes, which avoid problems such as liquid leakage, corrosion, environmental pollution, difficult assembly, and heavy weight of liquid supercapacitors. In addition to satisfying th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/14C08J3/075C08L97/00C08L71/02H01G11/56
CPCC08J3/075C08J7/14C08J2397/00C08J2471/02H01G11/56Y02E60/13
Inventor 刘珍珍王清文刘涛郭垂根欧荣贤
Owner SOUTH CHINA AGRI UNIV
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