Method of preparing electrode material for carbon-based supercapacitor by taking bamboo powder as raw material

A technology of supercapacitors and electrode materials, applied in the direction of hybrid capacitor electrodes, etc., to achieve the effect of improving capacitance performance

Active Publication Date: 2016-04-06
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there are few reports on the introduction of element doping into the preparation process of bamboo carbon for supercapacitors, and even less research involving phosphorus and nitrogen co-doped bamboo carbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of carbonized bamboo carbon powder

[0028] Place 60 g of moso bamboo powder in a temperature-programmed tube furnace, and raise the temperature from room temperature to 200 °C at a rate of 3 °C / min under nitrogen protection, and then keep it at this temperature for 2 hours to remove moisture and initially carbonize, then The temperature was raised to 750°C at 3°C / min, and kept at this temperature for 2 hours to remove volatile organic compounds and carbonize solid residues. Promptly obtain brown black carbonized bamboo charcoal powder 20g after temperature is down to room temperature.

[0029] (2) Preparation of activated bamboo charcoal powder

[0030] Mix 10g of the carbonized product prepared in step (1) with 40g of potassium hydroxide and 50mL of water (mass ratio 1:4:5), stir evenly, and heat in an oven at 100°C until the moisture content in the mixture is 20% of the initial value to obtain Black gelatinous paste. Then transfer the black colloid...

Embodiment 2

[0038] (1) Preparation of carbonized bamboo carbon powder

[0039] Place 60 g of moso bamboo powder in a temperature-programmed tube furnace, raise the temperature from room temperature to 250 °C at a rate of 5 °C / min under nitrogen protection, and then keep it at this temperature for 2 hours to remove moisture and initially carbonize, then The temperature was raised to 800°C at 5°C / min, and kept at this temperature for 2 hours to remove volatile organic compounds and carbonize solid residues. Will obtain brown black carbonized bamboo carbon powder 18g after temperature is down to room temperature.

[0040] (2) Preparation of activated bamboo charcoal powder

[0041] Mix 10g of the carbonized product prepared in step (1) with 50g of sodium hydroxide and 70mL of water (mass ratio 1:5:7), stir evenly, and heat in an oven at 100°C until the moisture content in the mixture is 25% of the initial value to obtain Black gelatinous paste. Then the black slurry was transferred to a t...

Embodiment 3

[0046] (1) Preparation of carbonized bamboo carbon powder

[0047] Place 60 g of moso bamboo powder in a temperature-programmed tube furnace, raise the temperature from room temperature to 300 °C at a rate of 1 °C / min under nitrogen protection, and then keep it at this temperature for 2 hours to remove moisture and initially carbonize, then The temperature was raised to 900°C at 1°C / min, and kept at this temperature for 2 hours to remove volatile organic compounds and carbonize solid residues. After the temperature is down to room temperature, 15g of brown-black carbonized bamboo charcoal powder will be obtained.

[0048] (2) Preparation of activated bamboo charcoal powder

[0049] Mix 10g of the carbonized product prepared in step (1) with 25g of potassium hydroxide and 30mL of water (mass ratio 2:5:6), stir evenly, and heat in an oven at 100°C until the moisture content in the mixture is 18% of the initial value to obtain Black gelatinous paste. Then the black slurry was ...

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Abstract

The invention provides a method of preparing electrode material for a carbon-based supercapacitor by taking bamboo powder as raw material. The method includes the following steps: under the protection of nitrogen, evenly mixing a carbonized product with alkali and water after bamboo powder as raw material undergoes two-stage carbonization, heating the above mixture to enable the water content of the mixture to be 10%-30% of that of the original mixture, conducting two-stage activation, cleaning and drying the mixture to obtain alkali activated bamboo powdered carbon, adding the alkali activated bamboo powdered carbon into a phosphor and nitrogen doped solution, conducting ultrasonic uniform mixing, then conducting a hydro-thermal reaction, and finally obtaining a finished product after post-treatment is conducted on a reaction solution. Cheap, environment-friendly and renewable bamboo that is easily available is taken as raw material to prepare carbon material for a supercapacitor, so the method has the noticeable cost advantage. Through two-stage carbonization and two-stage activation, impurities in bamboo material can be fully removed, and porous carbon material with high carbon content can be formed. Moreover, a phosphor, nitrogen and hetero atom codope process is introduced to enable bamboo carbon to have extra fake capacitance, so the capacitive performance of the supercapacitor can be greatly improved.

Description

(1) Technical field [0001] The invention relates to a preparation method of an electrode material for a supercapacitor, in particular to a method for preparing a carbon-based supercapacitor electrode material using bamboo powder as a raw material. (2) Background technology [0002] Supercapacitor is a new type of energy storage device between traditional capacitors and batteries, which has the advantages of high energy density and high power density. As the most important contributor to electrical energy storage in supercapacitors, the electrode material is a key factor affecting the performance and production cost of supercapacitors. 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 superc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/34C01B31/12
CPCY02E60/13H01G11/34
Inventor 陈浩沈哲红俞帅沈亚伦刘铎鲍滨福
Owner ZHEJIANG FORESTRY UNIVERSITY
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