Tartary buckwheat-based activated carbon material as well as preparation method and application thereof

A technology based on activated carbon and tartary buckwheat, applied in chemical instruments and methods, hybrid/electric double layer capacitor manufacturing, carbon compounds, etc., can solve the problem of material utilization efficiency reduction, affecting the service life of electric double layer supercapacitors, and the specific capacity of electrode materials Loss and other problems, to achieve the effect of repairing macropore defects, improving electrochemical cycle stability, and low overall cost

Active Publication Date: 2021-11-05
QINGDAO NINEX NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After searching, some biomass such as rice husk, pine nut husk, straw, etc. are used as raw materials for the preparation of supercapacitor activated carbon in the prior art, but the prepared activated carbon has low purity, high ash and volatile content, high oxygen-containing groups and cycle performance. Poor, affecting the service life of electric double layer supercapacitors
Especially under organic high-voltage operating conditions, its capacity decays quickly, and impurities introduce defects into the carbon material, resulting in inability to withstand high voltage and serious self-discharge phenomenon
In addition, in the initial operation stage, the existing activated carbon electrode materials all go through the process of "sharp attenuation first and then stable cycle" in capacity, which inevitably leads to the loss of specific capacity of electrode materials and the reduction of material utilization efficiency.

Method used

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  • Tartary buckwheat-based activated carbon material as well as preparation method and application thereof
  • Tartary buckwheat-based activated carbon material as well as preparation method and application thereof
  • Tartary buckwheat-based activated carbon material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Coarse carbon preparation: Under an argon atmosphere, tartary buckwheat powder with a particle size of 80 meshes was heated to 400 ° C at a constant temperature for 2 hours at a temperature of 3 ° C / min to obtain a coarse carbon powder;

[0039] (2) Pickling and impurity removal: After the crude carbon powder is naturally cooled and taken out, it is placed in a high-pressure reactor with 10wt% hydrochloric acid, soaked and washed at 80°C for 24 hours, then washed with water until neutral, and then dried ;

[0040] (3) Activation: Mix the carbon material obtained after pickling with sodium hydroxide at a mass ratio of 1:1.5 and soak for 2 hours, then dry it, then raise the temperature to 900°C at 3°C / min for 2 hours under an argon atmosphere , and then washed with water to neutral, and then dried;

[0041] (4) Pickling purification: the activated carbon material obtained after activation is placed in a high-pressure reactor together with 10wt% hydrochloric acid, s...

Embodiment 2

[0047] (1) Coarse carbon preparation: Under an argon atmosphere, tartary buckwheat powder with a particle size of 80 meshes was heated to 400 ° C at a constant temperature for 2 hours at a temperature of 3 ° C / min to obtain a coarse carbon powder;

[0048] (2) Pickling and impurity removal: After the crude carbon powder is naturally cooled and taken out, it is placed in a high-pressure reactor with 10wt% hydrochloric acid, soaked and washed at 80°C for 24 hours, then washed with water until neutral, and then dried ;

[0049] (3) Activation: Mix the carbon material obtained after pickling with sodium hydroxide at a mass ratio of 1:1.5 and soak for 2 hours, then dry it, then raise the temperature to 1100°C at 3°C / min for 2 hours under an argon atmosphere , then washed with water to neutral, and then dried;

[0050] (4) Pickling purification: the activated carbon material obtained after activation is placed in a high-pressure reactor together with 10wt% hydrochloric acid, soak...

Embodiment 3

[0056] (1) Coarse carbon preparation: Under an argon atmosphere, tartary buckwheat powder with a particle size of 80 meshes was heated to 400 ° C at a constant temperature for 2 hours at a temperature of 3 ° C / min to obtain a coarse carbon powder;

[0057] (2) Pickling and impurity removal: After the crude carbon powder is naturally cooled and taken out, it is placed in a high-pressure reactor with 10wt% hydrochloric acid, soaked and washed at 80°C for 24 hours, then washed with water until neutral, and then dried ;

[0058] (3) Activation: Mix the carbon material obtained after pickling with sodium hydroxide at a mass ratio of 1:1.5 and soak for 2 hours, then dry it, then raise the temperature to 1300°C at 3°C / min for 2 hours under an argon atmosphere , then washed with water to neutral, and then dried;

[0059] (4) Pickling purification: the activated carbon material obtained after activation is placed in a high-pressure reactor together with 10wt% hydrochloric acid, soak...

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Abstract

The invention discloses a tartary buckwheat-based activated carbon material as well as a preparation method and application thereof. The preparation method of the tartary buckwheat-based activated carbon material comprises the steps of crude carbon preparation, acid pickling impurity removal, activation, acid pickling purification, high-temperature carbon supplementation and the like. The low-cost activated carbon material is obtained, the purity of the activated carbon is improved, the volatile component and ash content of the material are reduced, and the content of oxygen-containing groups is reduced, so that the electrochemical cycle stability of the activated carbon material is improved.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a tartary buckwheat-based activated carbon material and a preparation method and application thereof. Background technique [0002] With the development of the economy, the problem of energy shortage is becoming more and more severe. The country also proposes to vigorously develop new energy sources to achieve the goals of "carbon peak" and "carbon neutrality". Therefore, it is imminent to find a low-cost, high-performance and green energy storage device. As a new type of energy storage element, supercapacitors have attracted people's attention due to their advantages such as short charging time, high power density and environmental protection. [0003] Compared with water systems, organic supercapacitors have higher voltage and energy density, which can better meet people's application needs in energy storage. Supercapacitors are divided into electric double layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318C01B32/324C01B32/348H01G11/34H01G11/86
CPCC01B32/318C01B32/324C01B32/348H01G11/34H01G11/86Y02E60/13
Inventor 辛民昌
Owner QINGDAO NINEX NEW ENERGY TECH CO LTD
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