Method for preparing nitrogen-enriched porous carbon material for supercapacitor by taking lignite as raw material

A technology for supercapacitors and porous carbons is applied in the field of preparing nitrogen-rich porous carbon materials for supercapacitors. Large specific capacity and good cycle stability

Inactive Publication Date: 2015-08-05
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The product that this application case obtains has higher specific surface area, lower ash content, good electrochemical performance, but this application case uses ZnCl 2 There are still many defects in the activation method: for example, the material before activation needs to use ZnCl 2 Solution impregnation treatment, the preparation process is cumbersome; in addition, the use of ZnCl 2 The specific surface area of ​​the carbon material prepared by activation is still low, and the maximum specific capacitance is only 207F g -1 , is not suitable as an electrode material for supercapacitors and still needs further improvement

Method used

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  • Method for preparing nitrogen-enriched porous carbon material for supercapacitor by taking lignite as raw material
  • Method for preparing nitrogen-enriched porous carbon material for supercapacitor by taking lignite as raw material
  • Method for preparing nitrogen-enriched porous carbon material for supercapacitor by taking lignite as raw material

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Embodiment 1

[0034] In conjunction with the accompanying drawings, a method for preparing a nitrogen-rich porous carbon material for a supercapacitor using lignite as a raw material in this embodiment collects the Shengli lignite produced in Xilinhot, Inner Mongolia, washes it with deionized water after crushing, and puts the cleaned lignite in Dry it in a vacuum oven at 60°C and place it in a quartz tube, raise the temperature to 500°C at a rate of 5°C / min in a tube furnace filled with nitrogen, and keep it warm for 2 hours. Then fully mix the lignite obtained by the above pre-carbonization with the activator potassium hydroxide at a mass ratio of 1:3, and activate it at a rate of 5°C / min to 800°C under a nitrogen atmosphere for 2 hours. The above-mentioned activated product was washed with 0.1M dilute hydrochloric acid, and then washed with deionized water until neutral, and then dried to obtain a nitrogen-rich porous carbon material.

[0035] In this embodiment, low-cost lignite is used...

Embodiment 2

[0041] A method of preparing a nitrogen-rich porous carbon material for a supercapacitor using lignite as a raw material in this embodiment, collects the Shengli lignite produced in Xilinhot, Inner Mongolia, washes it with deionized water after crushing, and puts the cleaned lignite in a vacuum drying box Dry at 60°C, place in a quartz tube, raise the temperature to 350°C at a rate of 1°C / min in a tube furnace with argon, and keep it warm for 2 hours. Then fully mix the lignite obtained by the above pre-carbonization with the activator at a mass ratio of 1:2. The activator is potassium hydroxide, and then activate it at a heating rate of 1°C / min to 700°C under an argon atmosphere. , The activation time is 1h. The above-mentioned activated product was washed with 0.1M dilute sulfuric acid, and then deionized water until neutral, and then dried to obtain a nitrogen-rich porous carbon material.

[0042] The electrochemical testing method of the nitrogen-rich porous carbon materi...

Embodiment 3

[0044] A method of preparing a nitrogen-rich porous carbon material for a supercapacitor using lignite as a raw material in this embodiment, collects the Shengli lignite produced in Xilinhot, Inner Mongolia, washes it with deionized water after crushing, and puts the cleaned lignite in a vacuum drying box Dry at 60°C, place in a quartz tube, raise the temperature to 450°C at a rate of 3°C / min in a tube furnace with argon gas, and keep it warm for 2 hours. Then fully mix the lignite obtained by the above pre-carbonization with the activator at a mass ratio of 1:4. The activator is sodium hydroxide, and then activate it at a heating rate of 3°C / min to 800°C under an argon atmosphere. , The activation time is 5h. The above-mentioned activated product was washed with 0.1 M dilute nitric acid, and then washed with deionized water until neutral, and then dried to obtain a nitrogen-rich porous carbon material.

[0045] The electrochemical testing method of the nitrogen-rich porous c...

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Abstract

The invention discloses a method for preparing a nitrogen-enriched porous carbon material for a supercapacitor by taking lignite as the raw material and belongs to the technical field of new energy. The method comprises the following steps: smashing the lignite, washing by deionized water to remove the surface impurities, washing and baking, heating up to a pre-carbonization temperature in an inert gas at the speed of 1-10 DEG C/min, and keeping the temperature for 2h to obtain the carbon precursor; grinding the carbon precursor, uniformly mixing with the alkali metal hydroxide, putting into the inert gas, heating up to an activation temperature in the inert gas at the speed of 1-10 DEG C/min, and keeping the temperature for 1-10h to obtain the activation product; and performing acid pickling and neutralization on the activation product, washing to be neutral by deionized water, drying and grinding to obtain the nitrogen-enriched porous carbon material for the supercapacitor. The high-performance nitrogen-enriched porous carbon material for the supercapacitor can be prepared from the lignite so that the nitrogen-enriched porous carbon material is excellent in performance, energy-saving, environmentally friendly, simple in process and low in cost and has a wide industrial application prospect by being used as the supercapacitor electrode material.

Description

technical field [0001] The invention belongs to the technical field of new energy, and more specifically relates to a method for preparing a nitrogen-rich porous carbon material for a supercapacitor using lignite as a raw material. Background technique [0002] Supercapacitor is a new type of electrochemical energy storage device between traditional electrostatic capacitors and secondary batteries. Compared with traditional energy storage devices, it has the advantages of higher energy density and power density, longer cycle life, high current charge and discharge, and good safety performance. Today, supercapacitors have great application prospects and market potential in many fields such as new energy vehicles, telecommunications, and military affairs. [0003] Porous carbon materials have the characteristics of low price, high specific surface area, adjustable pore size, superior electrochemical performance and environmental friendliness, and are often used as electrode m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
Inventor 原长洲周璐华惠侯林瑞杨龙
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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