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A lignin-based supercapacitor material with high area specific capacitance and its preparation method and application

A lignin-based, supercapacitor technology, applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of high energy consumption and poor flexibility, and achieve excellent flexibility, good reversibility, and good electric double layer The effect of capacitive behavior

Active Publication Date: 2022-05-13
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods still cannot avoid the traditional heat treatment, so they still require high energy consumption
Using the laser direct writing method used in the present invention, the existing work only makes lignin and other polymers into a film and performs laser direct writing. The final carbon material area specific capacitance (C A ) is very low and the flexibility is poor

Method used

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  • A lignin-based supercapacitor material with high area specific capacitance and its preparation method and application
  • A lignin-based supercapacitor material with high area specific capacitance and its preparation method and application
  • A lignin-based supercapacitor material with high area specific capacitance and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 The influence of lignin type on the area specific capacitance

[0043] 1. Preparation of supercapacitor materials with different lignin types according to the impregnation method

[0044] (1) Dissolve 20g of hydrolyzed lignin, preoxidized lignin, and kraft lignin in 1L of 0.1M H 2 SO 4 , stirring for 12 hours, rotating speed 500rpm, room temperature, and then filtering to obtain lignin with ash removed;

[0045] (2) Place the lignin in an oven at 40°C for drying;

[0046] (3) The dried lignin is dissolved in DMF, and the soaking solution is prepared in the same ratio (lignin: DMF = 40 mg: 100 μl);

[0047] (4) Cut the carbon cloth into a size of 2.5cm×1.5cm (length×width);

[0048] (5) Draw a 2.5cm×1.5cm area on the glass slide and place the carbon cloth;

[0049] (6) Use a 100μl pipette to absorb 100μl of impregnating solution, and spread it evenly on the drawn area of ​​the glass slide;

[0050] (7) spread the carbon cloth on the impregnating liquid...

Embodiment 2

[0061] Embodiment 2 impregnation method loading lignin (under different loads)

[0062] 1. Experimental steps

[0063] (1) Dissolve 20g of hydrolyzed lignin in 1L of 0.1M H 2 SO 4 , stirring for 12 hours, rotating speed 500rpm, room temperature, and then filtering to obtain lignin with ash removed;

[0064] (2) Place the lignin in an oven at 40°C for drying;

[0065] (3) The dried lignin is dissolved in DMF, and the impregnation solutions are prepared in different proportions (lignin: DMF = 20mg: 100μl / 30mg: 100μl / 40mg: 100μl / 50mg: 100μl / 60mg: 100μl / 80mg: 100μl / 100mg: 100μl);

[0066] (4) Cut the carbon cloth into a size of 2.5cm×1.5cm (length×width);

[0067] (5) Draw a 2.5cm×1.5cm area on the glass slide and place the carbon cloth;

[0068] (6) Use a 100μl pipette to absorb 100μl of impregnating solution, and spread it evenly on the drawn area of ​​the glass slide;

[0069] (7) spread the carbon cloth on the impregnating liquid, and allow the impregnating liquid to b...

Embodiment 3

[0076] Embodiment 3 melting method loading lignin

[0077] 1. Experimental steps

[0078] (1) Select lignin that can be melted below 180° C., and ball mill the lignin to obtain powdery lignin. The lignin used in this example is lignin extracted with an organic solvent.

[0079] (2) Add lignin at 20mg / cm 2 Spread evenly on the carbon cloth base, then place the carbon cloth coated with lignin in a heating furnace, heat it from room temperature to 180°C at a heating rate of 3°C / min, and stay at 180°C for 0.5 to 2 hours. 1 hour is used in the example. After cooling to room temperature, the molten lignin-carbon cloth composite material is obtained. At this point, the lignin has evenly melted on the carbon cloth.

[0080] (3) The composite material in step (2) is directly written by laser, and the laser used is 10.6 μm CO 2 . The printing power is 8-20W, specifically 8W, 12W, 16W, 20W. After laser direct writing, lignin can be converted into three-dimensional porous graphene ...

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Abstract

The invention provides a lignin-based supercapacitor material with high area specific capacitance, a preparation method and an application thereof. The supercapacitor material in the present invention is a composite material in which lignin-based porous graphene is combined on a substrate; and two preparation methods are provided. Method 1: The lignin is removed from the ash and then dissolved, and the obtained impregnating solution is impregnated with the substrate, dried and then subjected to laser direct writing, and the obtained lignin-based porous graphene-substrate composite material removes excess lignin. Method 2: Apply the ball-milled lignin on the substrate, melt and combine it on the substrate; then perform laser direct writing, and remove excess lignin from the obtained lignin-based porous graphene-substrate composite. Both methods can obtain the lignin-based supercapacitor material with high area specific capacitance described in the present invention. The supercapacitor material of the present invention uses flexible carbon cloth as a base material, has excellent flexibility, can be bent at any angle, and has ultrahigh area specific capacitance.

Description

technical field [0001] The invention belongs to the technical field of capacitor materials, and in particular relates to a lignin-based supercapacitor material with high area specific capacitance and a preparation method and application thereof. Background technique [0002] Lignin is the second most abundant natural polymer in nature (after cellulose). However, compared with cellulose, the high value-added applications of lignin have not been effectively exploited. Lignin has a highly aromatic structure and thus is an ideal carbon material precursor. Among many carbon materials, porous activated carbon can be used as an ideal carbon-based supercapacitor material because of its large specific surface area, high stability, and environmental protection. With the large demand for energy storage materials in modern society, the research on the development of supercapacitors prepared from green and renewable raw materials as precursors has become a hot spot. Therefore, it is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/34H01G11/86H01G11/84
CPCH01G11/34H01G11/86H01G11/84Y02E60/13
Inventor 曲望达孙新枝赵子竹
Owner QINGDAO AGRI UNIV
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