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Water system neutral electrolyte-based asymmetric supercapacitor and preparation method thereof

A technology of supercapacitor and electrolyte, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor electrolytes, etc., can solve the problems of low specific capacitance of activated carbon, limiting specific energy and specific power of asymmetric supercapacitors, etc. Achieve the effect of increasing porosity and specific surface area, good electrochemical performance, improving conductivity and stability

Inactive Publication Date: 2013-05-01
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The anode materials of traditional asymmetric supercapacitors mostly use carbon structural materials, such as activated carbon, but the specific capacitance of activated carbon is low, which limits the specific energy and specific power of asymmetric supercapacitors, and it is necessary to find anode materials with larger specific capacitance

Method used

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  • Water system neutral electrolyte-based asymmetric supercapacitor and preparation method thereof
  • Water system neutral electrolyte-based asymmetric supercapacitor and preparation method thereof
  • Water system neutral electrolyte-based asymmetric supercapacitor and preparation method thereof

Examples

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Embodiment 1

[0031] (1) Preparation of positive electrode active material: Weigh 0.1 g of industrial carbon nanotubes treated with nitric acid in 25 mL of deionized water for 2 h, add 0.3 g of potassium permanganate, stir for 6 h, and then transfer the mixed liquid to special In the hydrothermal kettle with Teflon liner, after hydrothermal reaction at 150 ℃ for 1 h, it was washed with deionized water and dried at 100 ℃ for 12 h to prepare manganese dioxide nanosheet / carbon nanotube composite material. The content of carbon nanotubes is 20%. The XRD and TEM images are attached figure 1 In (a), (c).

[0032] (2) Preparation of negative electrode active material: Weigh 0.716 g of manganese nitrate and 1.616 g of ferric nitrate, add them to 20 mL of pure ethanol and stir for 30 minutes, weigh 200 mg of graphene oxide (GO), add to pure ethanol, and vibrate ultrasonically, then Mix the above two parts of liquid, stir for 30 min, adjust the pH of the mixture to 10 with 6 mol / L NaOH solution, sti...

Embodiment 2

[0040] (1) Preparation of positive electrode active material: Weigh 0.05 g of industrial carbon nanotubes treated with nitric acid in 25 mL of deionized water for 2 h, add 0.3 g of potassium permanganate, stir for 6 h, and then transfer the mixed liquid to the special In the hydrothermal kettle with Teflon liner, after hydrothermal reaction at 150 ℃ for 1 h, it was washed with deionized water and dried at 100 ℃ for 12 h to prepare manganese dioxide nanosheet / carbon nanotube composite material. The content of carbon nanotubes is 10%.

[0041] (2) Preparation of negative electrode active material: Weigh 0.716 g of manganese nitrate and 1.616 g of ferric nitrate, add them to 20 mL of pure ethanol and stir for 30 min, weigh 80 mg of graphene oxide (GO), add to pure ethanol and vibrate ultrasonically, then Mix the above two parts of liquid, stir for 30 min, adjust the pH of the mixture to 10 with 6 mol / L NaOH solution, stir for 30 min, and then transfer the mixture to a Teflon line...

Embodiment 3

[0045] (1) Preparation of positive electrode active material: Weigh 0.3 g of potassium permanganate and dissolve in 25 mL of deionized water, stir for 6 h, then add 0.2 mol / L sulfuric acid solution (95%) under strong stirring, and then mix the liquid It was transferred to a hydrothermal kettle with a Teflon liner. After hydrothermal reaction at 150 ℃ for 1 h, it was washed with deionized water and dried at 100 ℃ for 12 h to prepare manganese dioxide nanosheets.

[0046] (2) Preparation of negative electrode active material: Weigh 0.716 g of manganese nitrate and 1.616 g of ferric nitrate, add them to 20 mL of pure ethanol and stir for 30 minutes, adjust the pH of the solution to 10 with 6 mol / L NaOH solution, stir for 30 minutes, and then The solution was transferred to a hydrothermal kettle with a Teflon liner. After a hydrothermal reaction at 180°C for 2 hours, it was washed with deionized water and dried at 60°C for 12 hours to prepare manganese ferrite nanoparticles.

[0...

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Abstract

The invention relates to a water system neutral electrolyte-based asymmetric supercapacitor and a preparation method thereof, wherein the working voltage of the water system neutral electrolyte-based asymmetric supercapacitor is 1.6V. An anode active material of the water system neutral electrolyte-based asymmetric supercapacitor is made of a manganese dioxide nano sheet or manganese dioxide nano sheet / carbon nanotube composite material, and a cathode active material of the water system neutral electrolyte-based asymmetric supercapacitor is made of a manganese ferrite nano particles or a manganese ferrite nano particle / graphene composite material. A super capacitor electrolyte adopts a water system neutral sodium sulfate solution and is packaged into the super capacitor. The water system neutral electrolyte-based asymmetric supercapacitor has the advantages of high specific capacitance and energy density and excellent rate performance and cycle performance.

Description

Technical field [0001] The invention relates to a 1.6V asymmetric supercapacitor based on electrolyte in water system and a preparation method thereof, and belongs to the technical field of selection and matching utilization of supercapacitors and asymmetric electrode materials. Background technique [0002] In recent years, with the continuous depletion of fossil energy and the continuous deterioration of the environment, people have focused more on the research of energy storage and conversion equipment. Compared with traditional capacitors, supercapacitors have higher energy density and higher power density than rechargeable batteries, so they can meet the needs of next-generation power equipment, especially hybrid electric vehicles. From the perspective of the development of supercapacitors, asymmetric supercapacitors are a very promising energy storage device. They have faster charging and discharging capabilities than batteries and greater energy density than traditional do...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/32H01G11/46H01G11/84H01G11/86H01G11/60
CPCY02E60/13
Inventor 夏晖李博朱冬冬
Owner NANJING UNIV OF SCI & TECH
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