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Supercapacitor electrode material and preparation method and application thereof

A technology for supercapacitors and electrode materials, applied in hybrid capacitor electrodes, chemical instruments and methods, inorganic chemistry, etc. The effect of high specific surface area

Inactive Publication Date: 2021-03-05
武汉金特明新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Electrode materials are the key to determining the electrochemical performance of supercapacitors. The current supercapacitor electrode materials mainly include carbon electrode materials, metal oxide electrode materials and conductive polymer electrode materials. Among them, manganese dioxide has a high theoretical specific capacitance, and the source It is widely, cheap and easy to obtain, and has little pollution. It is a supercapacitor electrode material with great development potential. However, when manganese dioxide is used as an electrode active material, it has the disadvantages of poor electrical conductivity and easy agglomeration. During the discharge process, the volume of manganese dioxide tends to expand, which causes the electrode material matrix to pulverize and fall off into the electrolyte, which reduces the specific capacity and electrochemical cycle stability of the electrode material, and seriously affects the capacitance and electrochemical stability of the supercapacitor. performance

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  • Supercapacitor electrode material and preparation method and application thereof
  • Supercapacitor electrode material and preparation method and application thereof

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Embodiment 1

[0029] A preparation method for a supercapacitor electrode material, comprising the steps of:

[0030] (1) Add manganese sulfate and ammonium persulfate to deionized water, stir and mix evenly, then transfer to the reaction kettle, then place the reaction kettle in a hydrothermal reaction box, and conduct a hydrothermal reaction at 140°C for 4 hours. The product is centrifuged, washed, and dried to obtain sea urchin-like nano-α-MnO 2 ; Wherein, the mass volume ratio (g / ml) of manganese sulfate, ammonium persulfate and deionized water is 1:1.2:50;

[0031] (2) the sea urchin-shaped nano-α-MnO prepared in step (1) 2 Add it into deionized water, heat to 100°C for 1.5h, and then cool to room temperature, then add 3-chloropropyltrimethoxysilane, ultrasonically disperse the mixture for 5h at 80°C, and the reaction is over Afterwards, the product was centrifuged, washed, and dried to obtain chloropropyl-functionalized nano-MnO 2; Among them, sea urchin-like nano-α-MnO 2 And the m...

Embodiment 2

[0037] A preparation method for a supercapacitor electrode material, comprising the steps of:

[0038] (1) Add manganese sulfate and ammonium persulfate into deionized water, stir and mix evenly, then transfer to the reaction kettle, then place the reaction kettle in a hydrothermal reaction box, and conduct a hydrothermal reaction at 160°C for 3 hours. The product is centrifuged, washed, and dried to obtain sea urchin-like nano-α-MnO 2 ; Wherein, the mass volume ratio (g / ml) of manganese sulfate, ammonium persulfate and deionized water is 1:1.2:50;

[0039] (2) the sea urchin-shaped nano-α-MnO prepared in step (1) 2 Add it into deionized water, heat it to 90°C and stir it for 2 hours. After the treatment is completed, cool it to room temperature, then add 3-chloropropyltrimethoxysilane, ultrasonically disperse it evenly, and react the mixture at 90°C for 8 hours. The product was centrifuged, washed, and dried to obtain chloropropyl-functionalized nano-MnO 2 ; Among them, se...

Embodiment 3

[0045] A preparation method for a supercapacitor electrode material, comprising the steps of:

[0046] (1) Add manganese sulfate and ammonium persulfate to deionized water, stir and mix evenly, then transfer to the reaction kettle, then place the reaction kettle in a hydrothermal reaction box, and conduct a hydrothermal reaction at 150°C for 4 hours. The product is centrifuged, washed, and dried to obtain sea urchin-like nano-α-MnO 2 ; Wherein, the mass volume ratio (g / ml) of manganese sulfate, ammonium persulfate and deionized water is 1:1.2:50;

[0047] (2) the sea urchin-shaped nano-α-MnO prepared in step (1) 2 Add it into deionized water, heat it to 100°C for 1.5h, and then cool it to room temperature, then add 3-chloropropyltrimethoxysilane, ultrasonically disperse the mixture at 80°C for 8h, and the reaction is over Afterwards, the product was centrifuged, washed, and dried to obtain chloropropyl-functionalized nano-MnO 2 ; Among them, sea urchin-like nano-α-MnO 2 An...

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Abstract

The invention relates to the technical field of supercapacitors, and provides a MnO2 in-situ modified nitrogen-doped porous carbon supercapacitor electrode material, which is characterized in that sea-urchin-shaped nanometer alpha-MnO2 has an ultrahigh specific surface area and a large number of electrochemical active sites, and is highly dispersed in a matrix of biphenyl phenol type phenolic resin; nitrogen-doped porous carbon is formed through high-temperature carbonization and potassium hydroxide etching, sea- urchin-shaped nanometer alpha-MnO2 is highly dispersed and doped in a porous carbon matrix in situ, a porous carbon skeleton plays a role in morphology support for the sea-urchin-shaped nanometer alpha-MnO2, buffering is provided for stress generated by volume expansion, and manganese dioxide pulverization and falling are avoided. And electrochemical cycling stability of the electrode material is improved. The nitrogen-doped porous carbon has excellent conductivity and pseudocapacitance effect, a three-dimensional conductive network is formed in sea-urchin-shaped nanometer alpha-MnO2, transmission of charges and ions is promoted, and rich pseudocapacitance is provided.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a supercapacitor electrode material and a preparation method and application thereof. Background technique [0002] A supercapacitor is a new type of energy storage device between a battery and a traditional dielectric capacitor. It realizes charge storage through the oxidation-reduction reaction between the electrolyte ion and the electrode or the double-layer effect. The supercapacitor has high power density, electric It has the advantages of large capacity, fast charging and discharging efficiency, long service life, etc., and has little environmental pollution. It is a green energy electrochemical device with broad application prospects. [0003] Electrode materials are the key to determining the electrochemical performance of supercapacitors. The current supercapacitor electrode materials mainly include carbon electrode materials, metal oxide electrode ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C01B32/318H01G11/24H01G11/30H01G11/34H01G11/46
CPCC01G45/02C01B32/318H01G11/24H01G11/34H01G11/46H01G11/30C01P2006/40C01P2004/30Y02E60/13
Inventor 刘金梅张腾冯林
Owner 武汉金特明新材料科技有限公司
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