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Method for preparing electrode carbon material for electrochemical capacitor from peanut shells

A technology for capacitors and carbon materials, applied in the field of biomass carbon material preparation, can solve the problems of difficult to achieve technology, difficult to separate components, insoluble biomass of biomass, etc., to reduce active sites, reduce specific surface area, specific surface area, etc. big effect

Active Publication Date: 2018-06-08
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there are two main problems in the utilization of biomass at present: first, fibrous biomass is a mixture, and it is difficult to separate a single component; second, most biomass is insoluble, so many methods based on solution methods Techniques to control the morphology, pore structure, or surface properties of materials are difficult to achieve

Method used

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  • Method for preparing electrode carbon material for electrochemical capacitor from peanut shells
  • Method for preparing electrode carbon material for electrochemical capacitor from peanut shells
  • Method for preparing electrode carbon material for electrochemical capacitor from peanut shells

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Embodiment 1

[0030] A preparation method of an electrode carbon material for an electrochemical capacitor, comprising the following steps:

[0031] (1) Pretreatment of peanut shells: wash and dry the collected peanut shells in an ultrasonic instrument, and pass through a 100-mesh sieve after crushing;

[0032] (2) Hydrothermal treatment: Weigh 6.0g of the peanut shell powder in step (1), add it to the hydrothermal reaction kettle, then add 60mL of deionized water, mix well; then put the reaction kettle at 200°C for hydrothermal reaction After 24 hours, filter and dry after the reaction to obtain lignite-like biomass hydrothermal carbon;

[0033] (3) Molten salt activation treatment: get 2.0g of hydrothermal carbon obtained in step (2), add 8.0g of Na 2 CO 3 -K 2 CO 3 Binary mixed salt, mixed evenly, placed in a corundum porcelain boat, placed in a tube furnace, in N 2 Under the protection of the atmosphere, pre-carbonize at 600°C for 1h, then heat up to 800°C for molten salt activatio...

Embodiment 2

[0036]A preparation method of an electrode carbon material for an electrochemical capacitor, comprising the following steps:

[0037] (1) Pretreatment of peanut shells: wash and dry the collected peanut shells in an ultrasonic instrument, and pass through a 100-mesh sieve after crushing;

[0038] (2) Hydrothermal treatment: Weigh 6.0g of peanut shell powder in step (1), add it to the hydrothermal reaction kettle, then add 30mL deionized water, mix well; then put the reaction kettle at 200°C for hydrothermal reaction After 24 hours, filter and dry after the reaction to obtain lignite-like biomass hydrothermal carbon;

[0039] (3) Molten salt activation treatment: get 2.0g of hydrothermal carbon obtained in step (2), add 8.0g of Na 2 CO 3 -K 2 CO 3 Binary mixed salt, mixed evenly, placed in a corundum porcelain boat, placed in a tube furnace, in N 2 Under the protection of the atmosphere, pre-carbonize at 600°C for 1h, then heat up to 800°C for molten salt activation for 1h...

Embodiment 3

[0042] A preparation method of an electrode carbon material for an electrochemical capacitor, comprising the following steps:

[0043] (1) Pretreatment of peanut shells: wash and dry the collected peanut shells in an ultrasonic instrument, and pass through a 100-mesh sieve after crushing;

[0044] (2) Hydrothermal treatment: Weigh 6.0g of the peanut shell powder in step (1), add it to the hydrothermal reaction kettle, then add 60mL deionized water, mix well; then put the reaction kettle at 180°C for hydrothermal reaction After 24 hours, filter and dry after the reaction to obtain lignite-like biomass hydrothermal carbon;

[0045] (3) Molten salt activation treatment: get 2.0g of hydrothermal carbon obtained in step (2), add 8.0g of Na 2 CO 3 -K 2 CO 3 Binary mixed salt, mixed evenly, placed in a corundum porcelain boat, placed in a tube furnace, in N 2 Under the protection of the atmosphere, pre-carbonize at 600°C for 1h, then heat up to 800°C for molten salt activation f...

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Abstract

The invention relates to the fields of resource utilization of waste biomasses and preparation of biomass carbon materials, and discloses a method for preparing an electrode carbon material for an electrochemical capacitor from peanut shells. The method comprises the following steps: performing hydrothermal reaction process on the peanut shells to generate lightly carbonized lignite-shaped hydrothermal carbon, completely mixing the hydrothermal carbon and salt, and further performing carbonization and activation at high temperature to prepare a porous carbon material. The porous carbon prepared by the method is high in specific surface area and reasonable in pore diameter structure, and serves as an electrode active material of the electrochemical capacitor. The specific capacitance valuereaches 447 F / g under the current density of 0.2 A / g. After cylic test is conducted for 10000 times under high current density of 10 A / g, the retention rate of 90 percent still can be maintained and high cycling stability is achieved. Compared with a single molten salt activation method, the porous carbon material which is prepared by a hydrothermal-molten salt combination technology has the following advantages: the capacitance performance is obviously improved, and the technology provides a brand new and reliable resourceful treatment mode for high-additional-value utilization of biomasses.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of waste biomass and preparation of biomass carbon materials, and in particular relates to a method for preparing electrode carbon materials of electrochemical capacitors by using peanut shells. Background technique [0002] With the popularity of portable electronic products and the growing hybrid vehicle market, the demand for high-performance electrochemical capacitors has increased significantly, and the demand for carbon materials as electrode materials for high-performance electrochemical capacitors has also increased. Among the many preparation methods of carbon materials, the preparation cost of biomass activated carbon is low, the source of raw materials is wide, and the process is simple. It has become the main process of activated carbon production. Therefore, biomass is an important industrial raw material for electrode carbon materials of electrochemical capacitors. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/342C01B32/324H01G11/24H01G11/44
CPCH01G11/24H01G11/44Y02E60/13
Inventor 汤迪勇孙杰雷炜东张硕文刘玉婷陈柯
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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