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Coconut-shell fiber-based activated carbon for supercapacitor and preparation method of activated carbon

A technology of supercapacitor and coir fiber, which is applied in the direction of hybrid capacitor electrodes, etc., can solve the problem of not being able to have high specific surface area and high specific capacity at the same time, and achieve the effects of low cost, simple process and rich source of raw materials.

Active Publication Date: 2016-09-07
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a coconut shell fiber-based activated carbon for supercapacitors, which solves the problem that existing activated carbon electrode materials for supercapacitors cannot have high specific surface area and high specific capacity at the same time

Method used

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  • Coconut-shell fiber-based activated carbon for supercapacitor and preparation method of activated carbon
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  • Coconut-shell fiber-based activated carbon for supercapacitor and preparation method of activated carbon

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Effect test

Embodiment 1

[0018] Embodiment 1: the preparation method of coconut shell fiber-based activated carbon for supercapacitor comprises the following steps:

[0019] (1) First, the coconut shell fiber is soaked in a 1% NaOH solution for 48 hours, washed with distilled water until neutral, and placed in an oven to dry at 110°C. After drying, pulverize, take 10g and put it in a closed furnace chamber, in an inert gas N 2 Under a protective atmosphere, the temperature was raised to 700°C at a rate of 3°C / min, and kept at 700°C for 1.5 hours to obtain a carbonized product;

[0020] (2) 2g of the carbonized product obtained in step (1) is ground and mixed with the 4g KOH activator; 2 ), the heating rate is 3°C / min, the temperature is raised to 800°C, and the activated product is obtained at 850°C for 1 hour;

[0021] (3) Wash the activated product obtained in step (2) with water, wash with 2% dilute hydrochloric acid, and then wash with water until the pH is 6-7; dry to prepare the coconut shell ...

Embodiment 2

[0022] Embodiment 2: the preparation method of coconut shell fiber-based activated carbon for supercapacitor comprises the following steps:

[0023] (1) First, soak the coconut shell fiber in NaOH solution with a mass fraction of 2% for 48 hours, wash it with distilled water until neutral, place it in an oven and dry it at 110°C, grind it after drying, take 10g and place it in a closed furnace In the cavity, under the protective atmosphere of inert gas, the temperature is raised to 700°C at a rate of 3°C / min, and the carbonization product is obtained at 700°C for 1.5h;

[0024] (2) 2g of the carbonized product obtained in step (1) is ground and mixed with 6gKOH activator; 2 Under a protective atmosphere, the heating rate is 3°C / min to 850°C, and the activated product is obtained at 850°C for 1 hour;

[0025] (3) Wash the activated product obtained in step (2) with water, wash with 2% dilute hydrochloric acid, and then wash with water until the pH is 6-7; dry to prepare the co...

Embodiment 3

[0026] Embodiment 3: the preparation method of coconut shell fiber-based activated carbon for supercapacitor comprises the following steps:

[0027] (1) First, soak the coconut shell fiber in a 3% NaOH solution for 48 hours, wash it with distilled water until it is neutral, place it in an oven and dry it at 110°C, grind it after drying, take 10g and place it in a closed furnace chamber, in an inert gas N 2 Under a protective atmosphere, heat up to 700°C at a rate of 3°C / min, and hold at 700°C for 1 hour to obtain a carbonized product;

[0028] (2) 2g of the carbonized product obtained in step (1) is ground and mixed with the 8gKOH activator; 2 ), the heating rate is 3°C / min, the temperature is raised to 850°C, and the activated product is obtained by keeping the temperature at 850°C for 1h;

[0029] (3) Wash the activated product obtained in step (2), remove impurities with 2% dilute hydrochloric acid, and then wash until the pH is 6-7; dry, and prepare coconut shell fiber-b...

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Abstract

The invention discloses a preparation method of coconut-shell fiber-based activated carbon for a supercapacitor. The method comprises the steps that pretreated coconut shell fibers are crushed and heated up to 700 DEG C to 750 DEG C at the speed of 2 DEG C / min to 5 DEG C / min, heat preservation is conducted for 1 h to 1.5 h, and a carbonized product is obtained; the carbonized product is ground and sieved, and the carbonized product and KOH are mixed to be uniform according to the mass ratio of 1:2 to 1:5; the temperature is increased to 800 DEG C to 850 DEG C at the speed of 3 DEG C / min to 5 DEG C / min, heat preservation is conducted for 1 h to 1.5 h, and an activated product is obtained; the activated product is subjected to water washing and acid washing and water washing till the pH ranges from 6 to 7, drying is conducted, and the activated carbon is obtained. According to the preparation method of the coconut-shell fiber-based activated carbon material for the supercapacitor, the coconut shell fibers serve as the raw material, multi-time activation is not needed, the technology is simple, and the cost is low; the prepared coconut-shell fiber-based activated carbon material for the supercapacitor has a high specific surface area and a high specific capacity.

Description

technical field [0001] The invention relates to porous carbon material technology, in particular to a coconut shell fiber-based activated carbon suitable for supercapacitors and a preparation method thereof. Background technique [0002] Due to the characteristics of high power, high energy, long cycle life and safety and reliability, supercapacitors are not only used in the field of high-power charging and discharging, but also used in energy recovery systems generated in electronic products, memory backup systems, mobile devices and braking processes etc., especially to provide auxiliary energy in the power transmission system of urban buses and garbage trucks, thereby reducing the limitation of vehicle mileage caused by frequent braking-starting. In terms of energy storage systems for vehicles such as electric vehicles in the future, the supercapacitor and battery hybrid system can meet the needs of high-power output occasions such as vehicle starting, climbing, and accel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12H01G11/34
CPCY02E60/13H01G11/34C01P2004/03C01P2006/12C01P2006/16C01P2006/40
Inventor 陈永
Owner HAINAN UNIVERSITY
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