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Preparation method of nitrogen-doped porous carbon material and application of nitrogen-doped porous carbon material in super capacitor

A nitrogen-doped porous carbon, supercapacitor technology, applied in the field of electrochemical energy storage, can solve the problems of difficult structure regulation, difficult template removal, complex synthesis process, etc., to achieve high energy density, improve hydrophilicity, and low price. Effect

Active Publication Date: 2019-05-21
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the commonly used methods for preparing hierarchically porous carbon materials are mainly soft template method and hard template method, but the hard template method faces problems such as long preparation period, complex synthesis process and difficult removal of template agent in the preparation process, while surfactants and The soft template method represented by aggregates has the defect that the structure is difficult to control

Method used

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  • Preparation method of nitrogen-doped porous carbon material and application of nitrogen-doped porous carbon material in super capacitor
  • Preparation method of nitrogen-doped porous carbon material and application of nitrogen-doped porous carbon material in super capacitor
  • Preparation method of nitrogen-doped porous carbon material and application of nitrogen-doped porous carbon material in super capacitor

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Embodiment 1

[0031] Example 1. Preparation of nitrogen-doped porous carbon materials.

[0032] (1) Dissolve 0.6 g of sodium alginate, 0.6 g of sodium citrate dihydrate, and 0.8 g of melamine in 40 mL of water. Placed in a ball mill jar with a volume of 100 mL, ball milled at 400 rpm for 4 h and mixed evenly. Freeze-dried, wait until material A.

[0033] (2) Material A was calcined at 600°C for 2 hours in a nitrogen atmosphere, cooled to room temperature, washed several times with 1 M hydrochloric acid and deionized, and dried at 80°C for 3 hours to obtain material B.

[0034] (3) Material B and KOH were mixed at a mass ratio of 1:1 and calcined at 800°C for 2 hours in a nitrogen atmosphere, then cooled to room temperature, washed with 1 M hydrochloric acid and deionized several times, and dried at 80°C for 3 hours to obtain nitrogen doped porous carbon material.

Embodiment 2

[0035] Example 2. Applications of nitrogen-doped porous carbon materials in supercapacitors.

[0036] (1) Mix the prepared nitrogen-doped porous carbon material with a binder and a conductive agent at a mass ratio of 8:1:1, coat it on a nickel foil with a thickness of 0.03 mm, and then dry it in vacuum to obtain a supercapacitor electrode piece.

[0037] (2) Pole sheets coated with nitrogen-doped porous carbon materials are used as both positive and negative electrodes, EMIMBF 4 As the electrolyte and cellulose acetate as the separator, a symmetrical soft-pack supercapacitor is assembled.

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Abstract

The invention relates to a preparation method of a nitrogen-doped porous carbon material and an application of the nitrogen-doped porous carbon material in a super capacitor. The preparation method ofthe nitrogen-doped porous carbon material comprises the following steps of: respectively dissolving sodium alginate, sodium citrate dihydrate and melamine in water according to a molar ratio, mixing,ball-milling, uniformly mixing and freeze-drying to obtain a material A; calcining the material A in an inert gas atmosphere, and washing with hydrochloric acid and deionized water to obtain a material B; mixing the material B with KOH and calcining in the inert gas atmosphere to obtain the nitrogen-doped porous carbon material; mixing the prepared nitrogen-doped porous carbon material with a binder and a conductive agent according to the mass ratio, coating the mixture on a current collector, and drying the mixture in vacuum to obtain an electrode sheet; then, the electrode sheet is used aspositive electrode and negative electrode at the same time, and assembling into a symmetrical soft package super capacitor. The preparation process is simple, the cost is low, and the prepared nitrogen-doped porous carbon material has higher specific surface area and uniform pore size distribution, and has higher mass specific capacitance and better cycle stability and multiplying power performance when being used as an electrode material of the super capacitor.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and relates to a preparation method of a porous carbon material and its application in supercapacitors. Background technique [0002] As a new type of energy storage device, supercapacitors have attracted much attention due to their much higher power density compared to batteries, fast charge and discharge capabilities, extremely high life, wide temperature range, and environmental friendliness. The electrode material is a key factor determining the performance of supercapacitors. Hierarchical porous carbon materials refer to the material structure containing a certain proportion of macropores, mesopores and micropores. Micropores play a necessary role in ion adsorption for the formation of the electric double layer effect. Mesopores shorten the ion transmission distance and promote the rapid diffusion and transmission of ions. Macropores are equivalent to the "buffer library" for s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/318H01G11/24H01G11/30H01G11/34H01G11/44H01G11/84H01G11/86
CPCY02E60/13
Inventor 袁凯肖迎波陈义旺廖学民
Owner NANCHANG UNIV
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