CN102915844A - Method for preparing different-electrode composite materials of carbon plate/manganese dioxide nanometer sheet and application thereof - Google Patents
Method for preparing different-electrode composite materials of carbon plate/manganese dioxide nanometer sheet and application thereof Download PDFInfo
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- CN102915844A CN102915844A CN2012104458166A CN201210445816A CN102915844A CN 102915844 A CN102915844 A CN 102915844A CN 2012104458166 A CN2012104458166 A CN 2012104458166A CN 201210445816 A CN201210445816 A CN 201210445816A CN 102915844 A CN102915844 A CN 102915844A
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Abstract
The invention relates to a method for preparing different-electrode composite materials of a carbon plate/manganese dioxide nanometer sheet and the application thereof. In the application, the prepared composite materials serve as the anode materials, the carbon plate serves as the cathode materials, and the anode materials and the cathode materials are together assembled into an asymmetric capacitor. The method includes: using a mesoporous carbon nanometer sheet to serve as a carrier to react with potassium permanganate (KMnO4) after acidification to obtain the different-electrode composite materials of the carbon plate/manganese dioxide nanometer sheet. The acidified carbon plate and the KMnO4 have a redox reaction, and the carbon plate can increase the conductivity of the manganese dioxide nanometer sheet, and simultaneously improve the electrochemical stability and multiplying power characteristics of the composite materials. The content of the manganese dioxide in the composite materials can be controlled by adjusting the time of the redox reaction, and accordingly the electrochemical performance of the composite materials can be affected. The method is simple, the raw materials are low in cost, the content of the components in the composite materials can be adjusted easily, scale production can be carried out easily, and the assembled asymmetric capacitor has the advantages of being high in specific capacitance, high in energy density and good in stability.
Description
Technical field
The invention belongs to the new energy materials field, relate to a kind of preparation method of asymmetric capacitor positive electrode, particularly, is preparation method and the application thereof of a kind of carbon plate/manganese dioxide nano-plates hierarchical composite material.
Background technology
Ultracapacitor is as a kind of novel energy storage device, have the power density height, have extended cycle life and the characteristics such as serviceability temperature wide ranges, it has extremely important using value at aspects such as electric power, green energy resource, aerospace field, Mobile energy system, backup power systems.Along with the rise of electric automobile and hybrid electric vehicle, the importance of high-energy-density, high power density energy storage device is day by day remarkable.Therefore, keeping under high-power, the long-life prerequisite of ultracapacitor, improving the focus that energy density becomes present ultracapacitor research.The energy density computing formula of ultracapacitor is: E=1/2CV
2, apparent, energy density can improve by specific capacity (C) and the potential range (V) that increases ultracapacitor.One of them effective method is to use organic electrolyte to improve the electromotive force window, but organic electrolyte cost height, poorly conductive, is difficult for assembling in air.Therefore, the Asymmetric Supercapacitor of aqueous electrolyte assembling more and more received publicity in recent years, and a utmost point of capacitor is double layer electrodes, and another is the pseudo capacitance electrode very.The asymmetric capacitor system of research mainly contains Carbon Materials/oxide system, polymer/Carbon Materials system etc. at present.
Wherein, for Carbon Materials/oxide system, researcher's manganese dioxide commonly used is as positive electrode, and carbon is as negative material, and neutral solution meets the concept of environmental protection as electrolyte.The more important thing is that the asymmetric capacitor of assembling potential range in neutral electrolyte rises to 2V, thereby improve widely the energy density of capacitor.Low-cost and eco-friendly material mainly are devoted in the at present research of positive and negative pole material.With regard to negative material, active carbon (AC) is widely used owing to its high-specific surface area and conductivity.Under high current charge-discharge, has high high rate performance in order to satisfy, desirable carbon cathode material should have the advantage that specific area height, pore-size distribution are narrow, hole length is short, and the mesoporous carbon nano flake of sheet sheet chi structure meets above requirement, so the mesoporous carbon nanometer sheet can be used as the negative material of asymmetric capacitor.And desirable positive electrode should have little nanostructure and high conductivity, so we combine the mesoporous carbon nanometer sheet and prepare novel hierarchical composite material as positive electrode with manganese dioxide nano-plates, because the conductivity of manganese bioxide material is very poor, the existence of carbon plate can improve the conductivity of positive electrode widely, and the structure of manganese dioxide nano-plates can take full advantage of pseudo capacitance simultaneously.
In order to satisfy the needs of ultracapacitor practical application, assembling a kind of asymmetric capacitor with high-energy-density density, specific power density and good circulation stability becomes current main task.
Summary of the invention
By above analysis as can be known, the hierarchy of carbon plate/manganese dioxide nano-plates not only can utilize the electric double layer capacitance of carbon but also can utilize the pseudo capacitance of manganese dioxide, can significantly improve specific capacity, energy density and the cyclical stability of asymmetric capacitor as positive electrode.
The objective of the invention is to propose a kind of method for preparing carbon plate/manganese dioxide nano-plates hierarchical composite material, and as the positive electrode of asymmetric capacitor, to overcome the existing defects of prior art.
Design of the present invention is such:
The present invention is take carbon plate as matrix, by redox reaction, obtains the hierarchical composite material that manganese dioxide nano-plates is modified carbon plate, and the existence of carbon plate can improve the conductivity of manganese dioxide greatly.This material not only can utilize the double layer capacity of carbon as positive electrode but also can utilize the pseudo capacitance of manganese dioxide, can improve significantly energy density and the cyclical stability of capacitor.
The present invention is achieved by the following technical solutions:
A kind of method for preparing the hierarchical composite material of carbon plate/manganese dioxide nano-plates comprises the steps:
(1) the porous magnesia nanometer sheet that magnesium oxide powder boiling reflux 2～24 hours and high-temperature calcination was obtained after 30～60 minutes is as template, getting the described porous magnesia nanometer sheet of 0.1～1g is scattered in the ethanolic solution that 0.5～10g contains 5～20wt% phenolic resins, stir rear at 80～120 ℃ of lower primary solidification 12～24h, then in argon gas atmosphere, carry out high temperature cabonization 4～6h, at last with the mesoporous carbon nanometer sheet that obtains sheet sheet intersection after the excessive sulfuric acid flush away template;
(2) in the ultrasonic 1～3M sulfuric acid solution that is distributed to 50～200ml of the mesoporous carbon nanometer sheet that obtains of weighing 0.1～0.3g step (1), be warmed up to 50～100 ℃ and stir the mesoporous carbon nanometer sheet that suction filtration after 2～4 hours obtains acidifying, lower dry in 50～80 ℃;
(3) the mesoporous carbon nanometer sheet with the described acidifying of 0.01～0.2g joins in 0.25～1M sulfuric acid solution of 10～100ml, it is disperseed fully in ultrasonic 10～30 minutes, is warmed up to 40～60 ℃;
(4) in the system of completing steps (3), add 0.05～0.4g KMnO
4, then stirring reaction 1～30 minute will obtain the hierarchical composite material of described carbon plate/manganese dioxide nano-plates after crude product washing, the oven dry.
Described mesoporous carbon nanometer sheet is the nano flake of 200～300nm, and pore-size distribution is 5～7nm.
Described KMnO
4Add fast under agitation 1～2 second.
The application of the hierarchical composite material of carbon plate/manganese dioxide nano-plates that said method obtains, described carbon plate/manganese dioxide hierarchical composite material as positive electrode, carbon plate as negative material, form asymmetric capacitor after the assembling, in 1M sodium sulphate electrolyte, have high specific capacity, specific energy density, specific power density and electrochemical stability.
Beneficial effect
The present invention utilizes the mesoporous carbon nanometer sheet of acidifying as carrier, and the method by redox reaction is at its superficial growth manganese dioxide nano-plates, and the hierarchy of depositing mutually by carbon plate and manganese dioxide improves the conductivity of manganese dioxide greatly, increases its capacitive property.And can control the content of manganese dioxide in the composite material by the time of regulating redox reaction, thereby affect its chemical property.In addition, because the reagent that uses in the preparation process is medicine commonly used, cheap being easy to get, preparation process is simple, is suitable for large-scale production.Utilize the method preparation carbon plate/the manganese dioxide nano-plates hierarchical composite material is as positive electrode, carbon plate is that the asymmetric capacitor of negative material assembling has large specific capacity, specific energy density and good cyclical stability.
Description of drawings
Fig. 1 is the electromicroscopic photograph of embodiment 2 products;
Fig. 2 is the cyclic voltammetry curve of the product of embodiment 1 and embodiment 2;
Fig. 3 is embodiment 2 with the asymmetric capacitor of carbon plate assembling at 10 mV s
-1Cyclic voltammetry curve under the sweep speed;
Fig. 4 is embodiment 2 with the asymmetric capacitor of carbon plate assembling at 0.1 A g
-1Current density under charging and discharging curve.
Embodiment
The below further specifies the present invention with embodiment, but protection scope of the present invention is not limited in embodiment.Other changes and modifications to those skilled in the art makes in the case of without departing from the spirit and scope of protection of the present invention still are included within the protection range of the present invention.
At first, the preparation method of mesoporous carbon is described, as follows:
The porous magnesia nanometer sheet that magnesium oxide powder boiling reflux 2～24 hours and high-temperature calcination were obtained after 30～60 minutes is as template, getting the described porous magnesia nanometer sheet of 0.1～1g is scattered in the ethanolic solution that 0.5～10g contains 5～20wt% phenolic resins, stir rear at 80～120 ℃ of lower primary solidification 12～24h, then in argon gas atmosphere, carry out high temperature cabonization 4～6h, at last with the mesoporous carbon nanometer sheet that obtains sheet sheet intersection after the excessive sulfuric acid flush away template.
Embodiment 1
In the ultrasonic 2M sulfuric acid solution that is distributed to 100ml of 0.2g mesoporous carbon nanometer sheet, be warmed up to 70 ℃ and stir the mesoporous carbon nanometer sheet that suction filtration after 3 hours obtains acidifying.The mesoporous carbon nanometer sheet of 0.05g acidifying is joined in the 25ml 0.5M sulfuric acid solution, it was disperseed fully in ultrasonic 15 minutes, be warmed up to 50 ℃, add 0.1g KMnO
4, stirring reaction 5 minutes will obtain the hierarchical composite material of carbon plate/manganese dioxide nano-plates after the washing of product process, the oven dry.
In the ultrasonic 2M sulfuric acid solution that is distributed to 100ml of 0.2g mesoporous carbon nanometer sheet, be warmed up to 70 ℃ and stir the mesoporous carbon nanometer sheet that suction filtration after 3 hours obtains acidifying.The mesoporous carbon nanometer sheet of 0.05g acidifying is joined in the 25ml 0.5M sulfuric acid solution, it was disperseed fully in ultrasonic 15 minutes, be warmed up to 50 ℃, add 0.1g KMnO
4, stirring reaction 10 minutes will obtain the hierarchical composite material of carbon plate/manganese dioxide nano-plates after the washing of product process, the oven dry.The electromicroscopic photograph of product as shown in Figure 1.
The electrochemical Characterization of embodiment 3 carbon plates/manganese dioxide nano-plates composite material
Composite material, conductive black and the ptfe emulsion ratio take mass ratio as 85:10:5 of embodiment 1 and 2 preparations is mixed, add a small amount of absolute ethyl alcohol, be pressed into thickness and be the thin slice about 1mm, be washed into the disk that diameter is 11mm, again compacting under 10MPa pressure.Two plate electrodes that quality is equal are as the positive and negative electrode of capacitor, and therebetween one deck barrier film is done electrolyte with 1 M metabisulfite solution, is assembled into the symmetrical ultracapacitor of simulation.As positive electrode, carbon plate is assembled into asymmetric ultracapacitor as negative material with composite material.The ultracapacitor of assembling is carried out cyclic voltammetric and constant current charge-discharge test at electrochemical workstation, and the result is shown in Fig. 2,3 and 4.According to formula
Can calculate the ratio capacitance that asymmetric capacitor is corresponding under the different current densities.
The specific capacity of C-active material in the formula, F g
-1
I-constant current value, A
t-discharge time, s
mThe summation of active material quality on the-positive and negative electrode sheet, g
Δ
V-discharge voltage is interval, V
Utilize embodiment 1 that this formula can calculate with 2 from specific capacity (the F g of asymmetric capacitor under different current densities of carbon plate assembling
-1):
Claims (4)
1. a method for preparing the hierarchical composite material of carbon plate/manganese dioxide nano-plates is characterized in that, comprises the steps:
(1) the porous magnesia nanometer sheet that magnesium oxide powder boiling reflux 2～24 hours and high-temperature calcination was obtained after 30～60 minutes is as template, getting the described porous magnesia nanometer sheet of 0.1～1g is scattered in the ethanolic solution that 0.5～10g contains 5～20wt% phenolic resins, stir rear at 80～120 ℃ of lower primary solidification 12～24h, then in argon gas atmosphere, carry out high temperature cabonization 4～6h, at last with the mesoporous carbon nanometer sheet that obtains sheet sheet intersection after the excessive sulfuric acid flush away template;
(2) in the ultrasonic 1～3M sulfuric acid solution that is distributed to 50～200ml of the mesoporous carbon nanometer sheet that obtains of weighing 0.1～0.3g step (1), be warmed up to 50～100 ℃ and stir the mesoporous carbon nanometer sheet that suction filtration after 2～4 hours obtains acidifying, lower dry in 50～80 ℃;
(3) the mesoporous carbon nanometer sheet with the described acidifying of 0.01～0.2g joins in 0.25～1M sulfuric acid solution of 10～100ml, it is disperseed fully in ultrasonic 10～30 minutes, is warmed up to 40～60 ℃;
(4) in the system of completing steps (3), add 0.05～0.4g KMnO
4, then stirring reaction 1～30 minute will obtain the hierarchical composite material of described carbon plate/manganese dioxide nano-plates after crude product washing, the oven dry.
2. method according to claim 1 is characterized in that, described mesoporous carbon nanometer sheet is the nano flake of 200～300nm, and pore-size distribution is 5～7nm.
3. method according to claim 1 is characterized in that, described KMnO
4Add fast under agitation 1～2 second.
4. the application of the hierarchical composite material of carbon plate/manganese dioxide nano-plates of obtaining of the arbitrary described method of claim 1～3, it is characterized in that, described carbon plate/manganese dioxide hierarchical composite material as negative material, forms asymmetric capacitor as positive electrode, carbon plate after the assembling.
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Cited By (8)
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|---|---|---|---|---|
| CN103258654A (en) * | 2013-05-04 | 2013-08-21 | 西南大学 | Method for manufacturing high-energy-density and high-power-density asymmetric supercapacitor based on eggshell inner membranes |
| CN103594254A (en) * | 2013-11-26 | 2014-02-19 | 华东理工大学 | Method for preparing manganese dioxide/mesoporous carbon nanometer graded composite electrode material |
| CN104134548A (en) * | 2014-07-09 | 2014-11-05 | 上海应用技术学院 | Porous composite material of manganese dioxide and carbon and preparation method thereof |
| CN105826084A (en) * | 2016-05-20 | 2016-08-03 | 北京化工大学常州先进材料研究院 | Method of preparing flaky transition metal oxide/nano carbon plate composite material |
| CN106684332A (en) * | 2017-03-14 | 2017-05-17 | 西南大学 | Preparation method of lithium ion battery anode material with laminated structure |
| CN106783203A (en) * | 2016-12-21 | 2017-05-31 | 浙江大学 | A kind of preparation method of manganese dioxide/ultramicropore flexibility carbon cloth, product and application |
| CN107230559A (en) * | 2017-06-28 | 2017-10-03 | 陕西科技大学 | A kind of preparation method of porous oxidation cerium composite |
| CN114899385A (en) * | 2022-06-10 | 2022-08-12 | 江西省纳米技术研究院 | Carbon/manganese dioxide composite material and preparation method and application thereof |
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| CN103258654A (en) * | 2013-05-04 | 2013-08-21 | 西南大学 | Method for manufacturing high-energy-density and high-power-density asymmetric supercapacitor based on eggshell inner membranes |
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| CN103594254B (en) * | 2013-11-26 | 2016-02-24 | 华东理工大学 | The preparation method of a kind of manganese dioxide/mesoporous carbon nanometer classification combination electrode material |
| CN103594254A (en) * | 2013-11-26 | 2014-02-19 | 华东理工大学 | Method for preparing manganese dioxide/mesoporous carbon nanometer graded composite electrode material |
| CN104134548B (en) * | 2014-07-09 | 2017-02-15 | 上海应用技术学院 | Porous composite material of manganese dioxide and carbon and preparation method thereof |
| CN104134548A (en) * | 2014-07-09 | 2014-11-05 | 上海应用技术学院 | Porous composite material of manganese dioxide and carbon and preparation method thereof |
| CN105826084A (en) * | 2016-05-20 | 2016-08-03 | 北京化工大学常州先进材料研究院 | Method of preparing flaky transition metal oxide/nano carbon plate composite material |
| CN106783203A (en) * | 2016-12-21 | 2017-05-31 | 浙江大学 | A kind of preparation method of manganese dioxide/ultramicropore flexibility carbon cloth, product and application |
| CN106783203B (en) * | 2016-12-21 | 2019-07-09 | 浙江大学 | A kind of preparation method, product and the application of manganese dioxide/ultramicropore flexibility carbon cloth |
| CN106684332A (en) * | 2017-03-14 | 2017-05-17 | 西南大学 | Preparation method of lithium ion battery anode material with laminated structure |
| CN106684332B (en) * | 2017-03-14 | 2019-10-29 | 西南大学 | The preparation method of the lithium ion battery anode material of laminated construction |
| CN107230559A (en) * | 2017-06-28 | 2017-10-03 | 陕西科技大学 | A kind of preparation method of porous oxidation cerium composite |
| CN114899385A (en) * | 2022-06-10 | 2022-08-12 | 江西省纳米技术研究院 | Carbon/manganese dioxide composite material and preparation method and application thereof |
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