Method for preparing supercapacitor carbon aerogel by utilization of bagasse

A technology of supercapacitors and carbon aerogels, which is applied in the fields of hybrid capacitor electrodes and hybrid/electric double layer capacitor manufacturing, etc., can solve the problem of difficulty in preparing high-performance carbon-based electrode materials, too large differences in structure and composition, and limited resources. and other problems, to achieve the effect of low price, abundant sources and broad development prospects

Active Publication Date: 2014-06-04
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials have limited resources and are difficult to collect, especially the structure and composition of the same piece of raw material are too different, so it is difficult to prepare high-performance carbon-based electrode materials with uniform properties

Method used

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  • Method for preparing supercapacitor carbon aerogel by utilization of bagasse
  • Method for preparing supercapacitor carbon aerogel by utilization of bagasse
  • Method for preparing supercapacitor carbon aerogel by utilization of bagasse

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] ①Wash the bagasse, dry it at 50°C, grind it, put it into a NaOH solution with a concentration of 4wt%, and stir it at 80°C for 4 hours, then filter it with deionized water until it is neutral, and put it into a volume Stir in a mixture of sodium chlorite / glacial acetic acid with a ratio of 1:1 for 10 hours, then filter and wash it with deionized water to neutrality, and dry it at 80°C to obtain fibers that remove lignin and hemicellulose plain powder;

[0031] ②The cellulose powder obtained in step ① is added to the NaOH / urea aqueous solution whose mass ratio of NaOH to urea and water is 3.75:5.75:40.5 with a mass fraction of 3wt%, stirred for 2h, and then placed in- Freeze at 20°C for 10 hours, thaw at room temperature and stir until transparent to obtain a sol; place the prepared sol at room temperature for 24 hours to obtain a gel; put the obtained gel into deionized water and regenerate it at 25°C for 4 hours, and regenerate The gel was frozen at -80°C for 10 hours...

Embodiment 2

[0035] ①Wash the bagasse, dry it at 50°C, grind it, put it into a NaOH solution with a concentration of 5wt%, and stir it at 80°C for 5 hours, then filter it with deionized water until it is neutral, and put it into a volume Stir in a mixture of sodium chlorite / glacial acetic acid with a ratio of 1:1 for 11 hours, then filter and wash it with deionized water to neutrality, and dry it at 80°C to obtain fibers that remove lignin and hemicellulose plain powder;

[0036] ②The cellulose powder obtained in step ① is added to the NaOH / urea aqueous solution whose mass ratio of NaOH to urea and water is 3.75:5.75:40.5 with a mass fraction of 5wt%, stirred for 2h, and then placed in- Freeze at 20°C for 11 hours, thaw at room temperature and stir until transparent to obtain a sol; place the prepared sol at room temperature for 24 hours to obtain a gel; put the obtained gel into deionized water and regenerate at 30°C for 3 hours, and regenerate The gel was frozen at -80°C for 11 hours, a...

Embodiment 3

[0040] ①Wash the bagasse, dry it at 50°C, grind it, put it into a NaOH solution with a concentration of 6wt%, and stir it at 80°C for 6 hours, then filter it with deionized water until it is neutral, and put it into the volume Stir in a mixture of sodium chlorite / glacial acetic acid with a ratio of 1:1 for 12 hours, then filter and wash it with deionized water to neutrality, and dry it at 80°C to obtain fibers with lignin and hemicellulose removed plain powder;

[0041] ②The cellulose powder obtained in step ① is added to the NaOH / urea aqueous solution whose mass ratio of NaOH to urea and water is 3.75:5.75:40.5 with a mass fraction of 7wt%, stirred for 3h, and then placed in- Freeze at 20°C for 12 hours, thaw at room temperature and stir until transparent to obtain a sol; place the prepared sol at room temperature for 24 hours to obtain a gel; put the obtained gel into deionized water and regenerate it at 50°C for 2 hours, and regenerate The gel was frozen at -80°C for 12 ho...

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Abstract

The invention discloses a method for preparing supercapacitor carbon aerogel by the utilization of bagasse. The method includes the steps that the bagasse is used for preparing cellulose powder without xylogen and hemicellulose; the cellulose powder is used for preparing cellulose aerogel; the cellulose aerogel is carbonized to obtain carbon aerogel; the carbon aerogel is activated to obtain the supercapacitor carbon aerogel. According to the method, the industrial waste bagasse is used as raw materials, the requirements for sustainable development and environmental protection are met, and the cost of electrode materials is effectively lowered. The product prepared through the method is of a three-dimensional hierarchical pore structure; compared with a product obtained through a conventional method, the product prepared through the method is large in specific area and good in repeatability, and has higher specific capacitance and better cycling stability. The method is more suitable for preparing supercapacitor electrode materials and has wide development prospects.

Description

technical field [0001] The invention relates to a method for preparing carbon aerogel, in particular to a method for preparing a supercapacitor carbon aerogel with a three-dimensional multi-level pore structure by using bagasse. Background technique [0002] With the development of social economy, people pay more and more attention to the ecological environment and green energy. As a new type of energy storage element, supercapacitors are increasingly valued. Compared with various energy storage devices widely used at present, supercapacitors have the advantages of high power density of ordinary capacitors and high energy density of secondary batteries, fast charging speed, long cycle life, wide operating temperature range, and no pollution to the environment. Widely used in data memory storage systems, backup power supplies, portable instruments and equipment, communication equipment, fuel cells, hybrid power supplies for electric vehicles and other fields. [0003] Elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/44H01G11/24
CPCY02E60/13
Inventor 刘宏郝品赵振环桑元华
Owner SHANDONG UNIV
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