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High-energy supercapacitor with porous carbon nitride interlayer material configuration and preparation method

A technology of supercapacitors and interlayer materials, applied in the manufacture of hybrid/electric double-layer capacitors, electrodes of hybrid capacitors, etc., can solve the problems of high specific capacitance, poor capacitance and cycle stability, low electron mobility, volume change electrode structure, etc.

Active Publication Date: 2020-10-27
XI AN JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Pseudocapacitive cathode materials based on metal compounds exhibit excellent reversible redox reaction characteristics in aqueous electrolyte (alkaline), and have the advantages of high specific capacitance, low cost, easy synthesis and low toxicity, but their low electron migration rate and the volume change accompanying the rapid redox process adversely affects the structure of the electrode, resulting in poor capacitive and cycle stability

Method used

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  • High-energy supercapacitor with porous carbon nitride interlayer material configuration and preparation method
  • High-energy supercapacitor with porous carbon nitride interlayer material configuration and preparation method
  • High-energy supercapacitor with porous carbon nitride interlayer material configuration and preparation method

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preparation example Construction

[0046] A method for preparing a water-based asymmetric supercapacitor based on porous carbon nitride / graphene / nickel disulfide as the positive electrode material and carbon nitride / graphene as the negative electrode material, using porous layered carbon nitride / graphene / disulfide Nickel is the positive electrode material, and carbon nitride / graphene with a porous structure is the negative electrode material. The specific preparation steps are as follows:

[0047] (1) Preparation of positive electrode material carbon nitride / graphene / nickel disulfide

[0048] Disperse cellulose powder in N,N-dimethylacetamide solvent, react with small organic molecules under heating and stirring conditions to obtain a modified cellulose dispersion solution; then add graphene N , the N-dimethylformamide dispersion liquid is stirred evenly, and then dispersed in water by centrifugation, separation, washing, and modified cellulose-modified graphene aqueous solution. The graphene aqueous solution ...

Embodiment 1

[0059] Preparation and characterization of carbon nitride / graphene / nickel disulfide material: Disperse 0.5mmol cellulose powder in N,N-dimethylacetamide solvent, add 5mmol succinic anhydride, stir and react at 80°C for a period of time , and then dropwise added 40mL of 2mg / mL graphene N,N-dimethylformamide dispersion, stirred at room temperature for a period of time, filtered, washed and then dispersed in water to obtain a modified cellulose-modified graphene aqueous solution. Dissolve 1 g of melamine in an acidic aqueous solution with a pH of 1, stir for 30 minutes, add 20 mg of modified cellulose-modified graphene dispersed in water, stir evenly, dry, and then calcinate at 550°C for 4 hours to obtain g-C 3 N 4 / graphene composites. Take 30mg of g-C 3 N 4 / Graphene was first ultrasonicated in N,N-dimethylformamide solution at a power of 250W for 2h, then filtered, washed, and then dispersed in 15mL aqueous solution, followed by adding 15mL of 0.6mmol nickel nitrate and 3m...

Embodiment 2

[0069] Preparation of carbon nitride / graphene / nickel disulfide material: Disperse 0.5mmol cellulose powder in N,N-dimethylacetamide solvent, add 4mmol citric acid, stir and react at 80°C for a period of time, then drop Add 80 mL of 0.5 mg / mL graphene N,N-dimethylformamide dispersion, stir at room temperature for a period of time, filter, wash and disperse in water to obtain a modified cellulose-modified graphene aqueous solution. Dissolve 0.2g of melamine in an acidic solution with a pH of 2, stir for 30 minutes, add 20mg of modified cellulose-modified graphene dispersed in water, stir evenly, dry, and then calcinate at 500°C for 6h to obtain g-C 3 N 4 / graphene composites. 15mg g-C 3 N 4 / Graphene was first ultrasonicated in N,N-dimethylformamide solution at 250W power for 4h, then filtered, washed, and then dispersed in 30mL water, followed by ethylene glycol solution with 0.6mmol nickel nitrate and 3mmol thiourea Mix well, and transfer the formed mixture to a 50mL po...

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Abstract

The invention discloses a water system asymmetric supercapacitor based on porous carbon nitride / graphene / nickel disulfide and carbon nitride / graphene and a preparation method thereof. The positive electrode material is obtained in a way that a one-step calcination method is utilized to obtain a g-C3N4 / graphene as the substrate and NiS2 is further loaded to obtain porous layered structure carbon nitride / graphene / nickel disulfide, and the negative electrode material is three-dimensional porous structure carbon nitride / graphene prepared by a solvothermal method. The working voltage of the assembled water system asymmetric supercapacitor is 1.6 V. When the energy density is 56Wh kg-1, the power density reaches 800W kg-1, and there is almost no attenuation of the capacity after 10000 cycles. The high specific energy is realized and the supercapacitor has the characteristics of high specific power, low preparation cost, environmental protection and high practical application value.

Description

technical field [0001] The invention belongs to the technical field of asymmetric supercapacitor electrode materials, and specifically relates to a water-based asymmetric supercapacitor based on porous carbon nitride / graphene / nickel disulfide and carbon nitride / graphene and a preparation method thereof. Background technique [0002] Supercapacitor is an important electrochemical energy storage device. Due to its advantages such as fast charge and discharge speed, long cycle life, high energy density and power density, it has broad applications in many fields such as green energy, transportation, electronic information, etc. application prospects. According to the different types of supercapacitor electrolyte, it can be divided into aqueous and organic supercapacitors. Aqueous supercapacitors are safer than organic systems, and have low preparation costs and are environmentally friendly. In addition, according to the structure of supercapacitors, they can also be divided in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/32H01G11/86
CPCH01G11/24H01G11/30H01G11/32H01G11/86Y02E60/13
Inventor 魏巍巫云萍
Owner XI AN JIAOTONG UNIV
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