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A sodium ion capacitor with high energy density and high power density and preparation method thereof

A high power density, high energy density technology, applied in the field of sodium ion capacitors with both high energy density and high power density and their preparation, can solve problems such as difficulty in meeting actual use requirements, low energy density and power density, etc. The effect of energy density, high power density, high energy density or power density

Active Publication Date: 2020-09-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current sodium ion capacitors are limited by the limitation of carbon negative electrode materials, and the energy density and power density are low, which is difficult to meet the actual use needs. Therefore, from the perspective of electrode materials, it is necessary to develop sodium ion capacitors with both high energy density and high power density. Capacitors are important

Method used

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  • A sodium ion capacitor with high energy density and high power density and preparation method thereof
  • A sodium ion capacitor with high energy density and high power density and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] A method for preparing a sodium ion capacitor having both high energy density and high power density, comprising the following steps:

[0021] Step 1, the specific surface area is 600m 2 / g, the pore volume is 0.8cm 3 / g of graphene-based porous carbon, mixed with conductive carbon black (superP), and binder PVDF according to the mass ratio of 80:10:10, adding organic solvent NMP (4:1 to porous carbon mass ratio) to obtain positive electrode slurry . The positive electrode slurry is coated on the aluminum foil, and after drying, rolling and punching, the positive electrode sheet of the sodium ion capacitor is obtained, that is, the porous carbon electrode sheet.

[0022] Step 2: Ultrasonic dispersion of graphene oxide and ammonium tetrathiomolybdate with a mass ratio of 2:5 and an appropriate amount of DMF (N, N-dimethylformamide), fully mixed and transferred to the polytetrafluoroethylene liner Solvothermal reaction at 190° C. for 18 hours in a closed reaction kettl...

Embodiment 2

[0026] A method for preparing a sodium ion capacitor having both high energy density and high power density, comprising the following steps:

[0027] Step 1, the specific surface area is 1200m 2 / g, the pore volume is 1.0cm 3 / g of activated carbon, mixed with conductive carbon black (superP) and binder PVDF according to the mass ratio of 75:10:15, and the organic solvent NMP (mass ratio of porous carbon: 4:1) was added to obtain the positive electrode slurry. The positive electrode slurry is coated on the aluminum foil, and after drying, rolling and punching, the positive electrode sheet of the sodium ion capacitor is obtained, that is, the porous carbon electrode sheet.

[0028] Step 2, fully mix 2 mg / ml graphene oxide ultrasonic dispersion with 2 mg / ml few-layer molybdenum disulfide ultrasonic dispersion, the volume ratio of graphene and molybdenum disulfide dispersion is 2:3. After fully mixing, dry at 180°C, heat to 800°C under an inert atmosphere, and keep it warm for ...

Embodiment 3

[0032] A preparation method of a sodium ion capacitor having both high energy density and high power density, comprising the following steps:

[0033] Step 1, the specific surface area is 1800m 2 / g, the pore volume is 1.4cm 3 / g of porous carbon, mixed with conductive carbon black (superP), and binder PVDF according to the mass ratio of 75:10:15, and the organic solvent NMP (mass ratio of porous carbon: 4:1) was added to obtain the positive electrode slurry. The positive electrode slurry is coated on the aluminum foil, and after drying, rolling and punching, the positive electrode sheet of the sodium ion capacitor, that is, the porous carbon electrode sheet is obtained.

[0034]Step 2, fully mix 2 mg / ml graphene oxide ultrasonic dispersion with 2 mg / ml few-layer molybdenum disulfide ultrasonic dispersion, the volume ratio of graphene and molybdenum disulfide dispersion is 1:19. After fully mixing, dry at 180°C, heat to 800°C under an inert atmosphere, and keep it warm for 1...

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Abstract

The invention relates to a sodium ion capacitor with high-energy density and high-power density and a preparation method thereof and belongs to the technical field of sodium ion capacitors. The sodiumion capacitor takes a molybdenum disulfide / graphene composite material as a cathode and a porous carbon material as an anode, and a sodium ion battery assembling technology is adopted; the sodium ioncapacitor provided by the invention has the following advantages that the molybdenum disulfide / graphene composite material is used for storing a lot of sodium ions through Faraday reaction; meanwhile, a lamellar structure and graphene are compounded and an extremely rapid electrochemical response behavior can be realized; meanwhile, the capacity of the capacitor and the charging / discharging speedare reinforced, and the sodium ion capacitor with the high-energy density and the high-power density is obtained; the ratio of a cathode material molybdenum disulfide to graphene is adjusted, and a micro-pore structure of a porous carbon anode material is adjusted, so that the rate performance of the sodium ion capacitor can be realized; the sodium ion capacitor has a wide actual application prospect.

Description

technical field [0001] The invention belongs to the technical field of sodium ion capacitors, in particular to a sodium ion capacitor with high energy density and high power density and a preparation method thereof. Background technique [0002] At present, mainstream energy storage devices are mainly divided into two categories: secondary batteries and supercapacitors, which have high energy density and high power density respectively. The energy storage mechanism of lithium-ion batteries and sodium-ion batteries in secondary batteries is similar, and the distribution of sodium resources on the earth is far more abundant than lithium resources, so the development of sodium-ion energy storage devices has attracted widespread attention. One pole of the sodium ion capacitor uses a sodium ion battery electrode, and the other pole uses a supercapacitor electrode, so it can achieve high energy density and high power density at the same time, and has good cycle stability. Its exc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/06H01G11/24H01G11/30H01G11/36H01G11/84H01G11/86
CPCH01G11/06H01G11/24H01G11/30H01G11/36H01G11/84H01G11/86Y02E60/13
Inventor 黄正宏展长振吕瑞涛沈万慈康飞宇
Owner TSINGHUA UNIV
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