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Method for preparing carbon-based super-capacitor electrode material from wood powder

A technology for supercapacitors and electrode materials, applied in hybrid capacitor electrodes, chemical instruments and methods, hybrid/electric double layer capacitor manufacturing, etc., can solve problems such as low production efficiency and increased material production costs, reduce production costs, and promote Activation and doping effects, the effect of simplifying the preparation process

Inactive Publication Date: 2018-03-09
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the existing technology of preparing carbon materials for supercapacitors from wood, multi-step processes such as high-temperature carbonization, alkali (or inorganic salt) activation, and element doping are usually used to maximize the capacitance of the prepared carbon materials. performance, but the complex process increases the cost of material production, and the production efficiency is very low
So far, there is no research report on the carbonization, activation, element doping and other steps that can be simultaneously achieved through only one high-temperature treatment process to make wood powder into wood carbon powder for supercapacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of wood charcoal powder

[0024] At room temperature, mix 15g of poplar wood powder with a particle size of 150 mesh, 35g of potassium hydroxide, 60g of urea, and 200g of water (mass ratio 1:2.3:4:13.3), and stir at 300r / min for 5h. During this period, due to the nitrogen source and The principle of preferential combination of wood flour forms a wood flour compound with high nitrogen content, which can avoid the direct action of alkali on wood flour and chemically degrade it into small molecules; then freeze it in a low-temperature refrigerator at -40°C for 24 hours, and then freeze it at -86°C Freeze-drying 3 days, by freeze-drying, what make activator (potassium hydroxide in this example) and dopant (urea in this example) be dispersed more evenly in raw material;

[0025] The obtained solid mixture was transferred into a tube furnace, and under the protection of nitrogen, the temperature was raised from room temperature to 900 °C at a rate of 3 °C / min,...

Embodiment 2

[0031] (1) Preparation of wood charcoal powder

[0032] At room temperature, mix 15g of poplar wood powder with a particle size of 150 mesh, 45g of sodium hydroxide, 75g of hexamethylenetetramine, and 150g of water (mass ratio 1:3:5:10), and stir at 300r / min for 10h. , due to the principle of preferential combination of nitrogen source and wood flour, a wood flour compound with high nitrogen content can be formed, which can avoid the direct action of alkali on wood flour and chemically degrade it into small molecules; Freeze-drying at -86°C for 4 days, through freeze-drying, the activator (sodium hydroxide in this example) and the dopant (hexamethylenetetramine in this example) are more uniformly dispersed in the raw material;

[0033] Transfer the resulting solid mixture into a tube furnace, raise the temperature from room temperature to 800°C at a rate of 2°C / min under nitrogen protection, and perform high-temperature heat treatment at 800°C for 2 hours. During the heat trea...

Embodiment 3

[0036] (1) Preparation of wood charcoal powder

[0037] At room temperature, mix 15g of poplar wood powder with a particle size of 150 mesh, 30g of sodium hydroxide, 60g of urea, and 150g of water (mass ratio 1:2:4:10), and stir at 300r / min for 10h. During this period, due to the nitrogen source and The principle of preferential combination of wood flour forms a wood flour compound with high nitrogen content, which can avoid the direct action of alkali on wood flour and chemically degrade it into small molecules; then freeze it in a low-temperature refrigerator at -40°C for 24 hours, and then freeze it at -86°C Freeze-drying for 3 days, by freeze-drying, activator (sodium hydroxide in this example) and dopant (urea in this example) are dispersed more evenly in raw material;

[0038]Transfer the resulting solid mixture into a tube furnace, raise the temperature from room temperature to 1000°C at a rate of 5°C / min under nitrogen protection, and perform high-temperature heat trea...

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Abstract

The invention discloses a method for preparing a carbon-based super-capacitor electrode material from wood powder. The method includes mixing wood powder with alkali, nitrogen source and water according to the weigh ratio of 1 to (1-6) to (2-12) to (5-30) while stirring for 5 to 20 hours to obtain a mixture; freezing the mixture at the temperature of -20 to -60 DEG C for 12 to 24 hours and then drying the same at the temperature of -60 to -100 DEG C for 1 to 6 days to obtain another mixture; treating the mixture while raising the temperature from room temperature to the temperature of 700-1000DEG C by the speed of 1-5 DEG C / min under protection of nitrogen gas for 1 to 4 days, then cooling to the room temperature to obtain a black product; mixing the black product with deionized water according to the weigh ratio of 1 to 20-70 while stirring for 10 to 30 minutes, standing for 2 to 4 hours, filtering and washing the product until the product is neutral, and then drying the product for12 to 24 hours to obtain the finished product carbon powder. With treatment of activation and pre-doping, carbonization, activation and element doping are achieved synchronously by one high-temperature processing only, preparation is simplified and production cost is lowered.

Description

technical field [0001] The invention relates to a method for preparing an electrode material for a supercapacitor, in particular to a method for preparing a carbon-based supercapacitor electrode material using wood flour as a raw material. Background technique [0002] Supercapacitor is a new type of energy storage device between traditional capacitors and batteries. It has the advantages of high energy density and high power density. As the main contributor to electric energy storage in supercapacitors, electrode materials affect the performance of supercapacitors. and key factors in production costs. Based on the charge storage mechanism, supercapacitor electrode materials are usually divided into electric double-layer capacitor materials and faradaic pseudocapacitive materials (also known as redox capacitor materials). Electric double layer capacitor materials represented by carbon materials are currently the most commercially used supercapacitor electrode materials on t...

Claims

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Application Information

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IPC IPC(8): C01B32/348H01G11/86H01G11/34H01G11/44
CPCY02E60/13H01G11/86H01G11/34H01G11/44
Inventor 陈浩沈哲红吴亚涛楼高波俞帅傅深渊
Owner ZHEJIANG FORESTRY UNIVERSITY
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