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All-solid-state flexible supercapacitor based on porous carbon fiber sheet and preparation method thereof

A porous carbon fiber and supercapacitor technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of unfavorable sustainable development, harsh reaction conditions, high production cost, etc. The effect of control and short preparation cycle

Active Publication Date: 2017-09-29
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in these preparation methods, the use of a large amount of strong acid will cause certain harm to the environment, which is not conducive to sustainable development, and the steps are cumbersome and the reaction conditions are harsh.
In addition, the production cost of commercial carbon cloth currently available in the market is very high, which limits its further application.

Method used

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  • All-solid-state flexible supercapacitor based on porous carbon fiber sheet and preparation method thereof
  • All-solid-state flexible supercapacitor based on porous carbon fiber sheet and preparation method thereof
  • All-solid-state flexible supercapacitor based on porous carbon fiber sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of carbon fiber cloth

[0030] The waste cotton fiber fabric is ultrasonically cleaned in acetone, ethanol and deionized water in sequence to remove dust, impurities and organic pollutants on the fiber surface. After cleaning, it is dried in an oven at 105°C for 10 hours, and then the cleaned and dried cotton fiber is The fabric was placed in an open tube furnace, and under the protection of a nitrogen atmosphere, the temperature was raised to 800 °C at a rate of 5 °C / min, carbonized at a constant temperature for 90 minutes, and then naturally cooled to room temperature to obtain carbon fiber cloth (cTC).

[0031] 2. Preparation of KOH chemically activated porous carbon fiber cloth

[0032] Immerse the carbon fiber cloth obtained in step 1 and KOH in a mass ratio of 1:3 into 50 mL of KOH aqueous solution with a mass-volume concentration of 0.3 g / mL, and turn the carbon fiber cloth up and down every 10 to 30 minutes until the KOH The aqueous solution comp...

Embodiment 2

[0038] 1. Preparation of carbon fiber cloth

[0039] In this step, under the protection of a nitrogen atmosphere, the temperature was raised to 800° C. at a rate of 10° C. / minute, and carbonized at a constant temperature for 120 minutes. Other steps were the same as step 1 of Example 1 to obtain a carbon fiber cloth.

[0040] 2. Preparation of KOH chemically activated porous carbon fiber cloth

[0041] In this step, the carbon fiber cloth and KOH obtained in step 1 are immersed in 30 mL of KOH aqueous solution with a mass-volume concentration of 0.2 g / mL according to a mass ratio of 1:2, and under the protection of a nitrogen atmosphere, the temperature is increased at a rate of 10 °C / min. The temperature was raised to 1000° C., and the temperature was activated for 60 minutes. Other steps were the same as Step 2 of Example 1 to obtain a KOH chemically activated porous carbon fiber cloth. Using BET physical adsorption test, the specific surface area of ​​the obtained porous c...

Embodiment 3

[0045] 1. Preparation of carbon fiber cloth

[0046] This step is the same as Step 1 of Example 1.

[0047] 2. Preparation of KOH chemically activated porous carbon fiber cloth

[0048] In this step, the carbon fiber cloth and KOH obtained in step 1 are immersed in 20 mL of KOH aqueous solution with a mass-volume concentration of 0.1 g / mL at a mass ratio of 1:1, and under the protection of a nitrogen atmosphere, the temperature is increased at a rate of 1 °C / min. The temperature was raised to 800° C., and activated at a constant temperature for 100 minutes. The other steps were the same as step 2 of Example 1 to obtain a KOH chemically activated porous carbon fiber cloth. Using BET physical adsorption test, the specific surface area of ​​the obtained porous carbon fiber cloth is 644m 2 / g, the total pore volume is 0.36cm 3 / g. Using four-probe test, the electrical conductivity of the obtained porous carbon fiber cloth is 1754S / m. In 6mol / L KOH electrolyte, the area specif...

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Abstract

The invention discloses an all-solid-state flexible supercapacitor based on a porous carbon fiber sheet and a preparation method thereof. Waste cotton fiber fabric is used as a raw material to prepare the porous carbon fiber sheet, the acquired porous carbon fiber sheet has high specific surface area, a classified porous structure and a relatively high conductivity, meanwhile the original hollow tubular structure of the cotton fiber and the original compact weaving characteristics of the fabric can still be reserved, and thus the porous carbon fiber sheet can be used as a flexible electrode of the supercapacitor without adding any conductive agent and adhesion agent, the all-solid-state flexible supercapacitor device can be assembled, and the device can work normally under different bending states and shows excellent flexibility. According to the all-solid-state flexible supercapacitor based on the porous carbon fiber sheet provided by the invention, effective recycling of wastes is achieved, and production cost of the carbon sheet is effectively reduced, so that economic benefits are significant. Meanwhile, the preparation process of the porous carbon fiber sheet avoids the use of a large amount of strong acid, and is green and safe, the preparation steps are simple and the preparation process is controllable, a preparation period is short, and industrial production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to an all-solid flexible supercapacitor based on porous carbon fiber cloth and a preparation method thereof. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, store electrical energy through rapid ion adsorption / desorption processes on the electrode surface or reversible redox reactions. The electrochemical performance of supercapacitors is between secondary batteries and electrolytic capacitors. Its power density is much higher than that of secondary batteries, and its energy density is much higher than that of electrolytic capacitors. It also has short charging and discharging time, long service life, and wide operating temperature range. As well as safety and stability, it has become a research hotspot in the field of new energy. In recent years, in order to meet the market demand of portable and wearable electronic devi...

Claims

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Application Information

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IPC IPC(8): H01G11/84H01G11/40H01G11/34H01G11/44
CPCY02E60/13H01G11/84H01G11/34H01G11/40H01G11/44
Inventor 雷志斌张文亮于航郅磊李婷
Owner SHAANXI NORMAL UNIV
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