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Method for preparing micro-porous carbon-structural electrode material from plant materials and application of micro-porous carbon-structural electrode material

A technology of electrode materials and plant materials, which is applied in the field of electrode materials with microporous carbon structures, can solve the problems of unsatisfactory commercial applications, expensive raw materials, and difficulty in commercial applications, and achieve the benefits of diffusion and electron transmission, The effect of reducing the preparation cost and improving the efficiency of the electrode reaction

Active Publication Date: 2017-09-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Long Qie et al. used the oxidant-template-induced polymerization method to synthesize a porous carbon fiber network structure using pyrrole monomers. It has ultra-high specific capacity and excellent cycle stability, but its disadvantages are that the raw materials required are expensive and it is difficult to realize commercial applications (Adv .Mater.2012,24,2047–2050); Zhiqiang Xie et al. used metal-organic framework (MOF) and graphene to synthesize a sandwich structure of porous carbon nanospheres grown on graphene sheets. Similarly, although it has excellent properties and Novel structure, but the preparation process of replication makes it unable to meet commercial applications (ACS Appl.Mater.Interfaces 2016,8,10324-10333)

Method used

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  • Method for preparing micro-porous carbon-structural electrode material from plant materials and application of micro-porous carbon-structural electrode material
  • Method for preparing micro-porous carbon-structural electrode material from plant materials and application of micro-porous carbon-structural electrode material
  • Method for preparing micro-porous carbon-structural electrode material from plant materials and application of micro-porous carbon-structural electrode material

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Effect test

Embodiment 1

[0036] A green preparation method of a high-performance electrode material with a microporous carbon structure prepared from a plant material such as figure 1 shown, including the following steps:

[0037] Step 1: Removing residual sugar from sugar cane residue

[0038] Squeeze the sugarcane dry and cut into small pieces with a length of 3 cm, boil them in pure deionized water and ethanol for 1.5 hours each, repeat this twice to remove the residual sugar, and then dry them in an oven at 80 degrees for 8 hours Dry it.

[0039] Step 2: Carbonization of Sugarcane Residue

[0040] The dried sugarcane residue obtained in the above step 1 was heated to 900° C. under the atmosphere of protective gas argon, kept for 4 hours, and then naturally cooled to obtain a microporous carbon material.

[0041] Step 3: Surface functionalization of microporous carbon materials

[0042] Soak the microporous carbon material prepared in step 2 in a solution prepared by 3:1 volume ratio of 98% con...

Embodiment 2

[0044] A high-performance electrode material with a plant material microporous carbon structure of the present invention, the microporous carbon structure is loose and porous, the pore size is 3.5 microns, and the surface is rich in hydroxyl, carboxyl and carbonyl and other nutrient-containing functional groups. These oxygen-containing functional groups will be on the carbon surface These surface defects provide more reaction sites for lithium ion storage, and the adsorption of lithium ions on oxygen-containing functional groups also provides additional lithium ion storage capacity.

[0045] The green preparation method of the high-performance electrode material of the plant material microporous carbon structure comprises the following steps:

[0046] Step 1: Removing residual sugar from corn stalk residue

[0047] Squeeze the corn stalks dry and cut them into small pieces with a length of 4 cm, boil them in pure deionized water and ethanol for 1 hour each, and repeat this thr...

Embodiment 3

[0054] A green preparation method of a high-performance electrode material with a microporous carbon structure prepared from a plant material comprises the following steps:

[0055] Step 1: Removing residual sugar from sorghum residue

[0056] Squeeze the sorghum dry and cut it into small pieces with a length of 5 cm, boil it in pure deionized water and ethanol for 2 hours each, repeat this twice to remove the residual sugar, and then dry it in an oven at 100 degrees for 10 hours Dry it.

[0057] Step 2: Carbonization of Sugarcane Residue

[0058] The dried sugarcane residue obtained in the above step 1 is heated to 1100° C. under the atmosphere of protective gas argon, kept for 5 hours, and then naturally cooled to obtain a microporous carbon material.

[0059] Step 3: Surface functionalization of microporous carbon materials

[0060] Soak the microporous carbon material prepared in step 2 in a solution prepared by 3:1 volume ratio of 98% concentrated sulfuric acid and 70%...

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Abstract

The invention provides a method for preparing micro-porous carbon-structural electrode material from plant materials and application of the micro-porous carbon-structural electrode material and belongs to the field of new-generation energy storage. The method includes the steps of firstly, frequently boiling water and ethyl alcohol mixture containing cellulose-enriched plants to remove proteins, fats, sucrose organics; secondly, heating and drying and then subjecting the mixture to high-temperature calcination in atmosphere of protective gases, cooling naturally to obtain a micro-porous carbon-structural material; thirdly, putting the micro-porous carbon-structural material in mixed solution of sulfuric acid and nitric acid while stirring continuously for 10-20 minutes to achieve surface functionalization. According to the method, the cellulose-enriched plant residues are utilized for preparing the electrode material for the first time, acid solution can be recycled, the whole preparation is simple and free of pollution, the method can be applied to production in scale, and the prepared electrode material has excellent performance which is similar to the lithium-ion storage performance of graphene material, has high practicable value, and has potential to substitute for the commercial graphite to serve as the novel lithium-ion battery electrode material.

Description

technical field [0001] The invention belongs to the field of materials and electrochemical energy storage devices, and more specifically relates to an electrode material with a microporous carbon structure prepared from plant materials. Background technique [0002] With the increasing demand and consumption of fossil fuels in modern life and industrial production, the living environment of human beings is facing a severe test, which also stimulates people to continuously explore and develop clean and renewable energy, and the most commonly used energy sources such as solar energy and wind energy All renewable energy sources are intermittent and cannot continuously increase energy. Therefore, it is necessary to develop high-efficiency energy storage technology to store energy when the energy supply is sufficient and to provide energy when the energy supply is insufficient. [0003] As a high-performance energy storage device, secondary lithium-ion batteries have developed ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/96
CPCH01M4/625H01M4/96Y02E60/10Y02E60/50
Inventor 王春栋敖翔江建军
Owner HUAZHONG UNIV OF SCI & TECH
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