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Silicon dioxide-based high-specific-capacity supercapacitor electrode material, and preparation method thereof

A supercapacitor, high specific capacity technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, etc., can solve problems such as poor conductivity, unstable silicon-based material structure, low coulombic efficiency, etc., to increase conductivity , increase cycle stability, high electrochemical activity effect

Pending Publication Date: 2021-07-09
GUANGDE TIANYUN NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, nano-silicon dioxide has attracted extensive attention from researchers because of its unique pseudocapacitive properties and can be applied to supercapacitor electrode materials. However, the structure of silicon-based materials is not stable during charge and discharge, and will produce obvious volume changes. In addition SiO 2 The electrical conductivity itself is poor, and when used as an electrode material, it will produce a lower Coulombic efficiency

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  • Silicon dioxide-based high-specific-capacity supercapacitor electrode material, and preparation method thereof
  • Silicon dioxide-based high-specific-capacity supercapacitor electrode material, and preparation method thereof
  • Silicon dioxide-based high-specific-capacity supercapacitor electrode material, and preparation method thereof

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Effect test

Embodiment 1

[0029] Silicon dioxide-based electrode materials for high specific capacity supercapacitors, including carboxylated carbon nanotubes covered with nano-SiO 2 spheres, nano-SiO 2 The outer surface of the ball is covered with nano-carbon shells, and the carboxylated carbon nanotubes are connected with nano-SiO coated with nano-carbon shells. 2 ball.

[0030] See figure 1 Shown, the preparation method of the high specific capacity supercapacitor electrode material based on silicon dioxide specifically includes the following steps:

[0031] Add 60 mg of carboxylated carbon nanotubes to 100 ml of 95% ethanol, repeat ultrasonication 4 times until a stable suspension is formed, then add ammonia water to adjust the pH and stir at room temperature until the solution is uniform, then orthosilicic acid Tetraethyl ester was slowly dropped into the above mixed solution, and stirred in a water bath at a constant temperature of 45° C. for 25 minutes. Then add resorcinol and formaldehyde f...

Embodiment 2

[0034] Silicon dioxide-based electrode materials for high specific capacity supercapacitors, including carboxylated carbon nanotubes covered with nano-SiO 2 spheres, nano-SiO 2 The outer surface of the ball is covered with nano-carbon shells, and the carboxylated carbon nanotubes are connected with nano-SiO coated with nano-carbon shells. 2 ball.

[0035] See figure 1 Shown, the preparation method of the high specific capacity supercapacitor electrode material based on silicon dioxide specifically includes the following steps:

[0036] Add 30 mg of carboxylated carbon nanotubes to a mixed solution of 90 ml of absolute ethanol and 10 ml of deionized water, repeat ultrasonication for 4 times until a stable suspension is formed, then adjust the pH with ammonia water and stir evenly at room temperature, Then slowly add tetraethyl orthosilicate dropwise thereafter, stir in a water bath at a constant temperature of 55°C for 25 minutes, then add resorcinol and formaldehyde for the s...

Embodiment 3

[0038] Silicon dioxide-based electrode materials for high specific capacity supercapacitors, including carboxylated carbon nanotubes covered with nano-SiO 2 spheres, nano-SiO 2 The outer surface of the ball is covered with nano-carbon shells, and the carboxylated carbon nanotubes are connected with nano-SiO coated with nano-carbon shells. 2 ball.

[0039] See figure 1 Shown, the preparation method of the high specific capacity supercapacitor electrode material based on silicon dioxide specifically includes the following steps:

[0040] Add 30 mg of carboxylated carbon nanotubes to a mixed solution of 97.5 ml of absolute ethanol and 2.5 ml of deionized water, then add ammonia water to adjust the pH and stir evenly at room temperature, then slowly add orthosilicic acid drop by drop Tetraethyl ester, stirred in a water bath at a constant temperature of 35°C for 40min, then added resorcinol and formaldehyde for the synthesis of phenolic resin, the quality of carboxylated carbon...

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Abstract

The invention discloses a silicon dioxide-based high-specific-capacity supercapacitor electrode material, and a preparation method thereof. Carboxylated carbon nanotubes (CNT) are dispersed in an ethanol aqueous solution, tetraethyl orthosilicate is dropwise added, nano SiO2 is prepared by hydrolysis of tetraethyl orthosilicate under an alkaline condition, and finally the nano SiO2 is coated with phenolic resin and carbonized to obtain the silicon dioxide-based high-specific-capacity supercapacitor electrode material. Experiment conditions are controlled to obtain SiO2 spheres which are small in particle size and coated with a nano carbon shell, the SiO2 spheres have more electrochemical active sites and show larger specific capacitance, the ordered structure of the nano carbon shell can adapt to the volume change of SiO2 during charging and discharging, mechanical fracture is effectively avoided, and the cycling stability is improved; and by adding the carbon nano tubes (CNT) with high conductivity and high electrochemical activity, the nano SiO2 spheres grow orderly along the carbon nano tubes (CNT), so that the conductivity of the silicon-based material and the physical connection between the carbon-based materials are improved, and the electrochemical performance of the composite structure can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation and energy storage, in particular to a silicon dioxide-based high-specific-capacity supercapacitor electrode material and a preparation method. Background technique [0002] In recent years, in order to realize the concept of sustainable development, energy storage technology has been continuously developed. Supercapacitors (SCs) have been developed as a new type of energy storage device that can replace secondary batteries and have quickly become a research hotspot. Compared with traditional capacitors, supercapacitors have higher specific capacity and energy density. Compared with secondary batteries, it has higher power density. [0003] A supercapacitor is generally composed of a positive electrode, a negative electrode, an electrolyte, and a separator, and its specific capacity mainly depends on the specific capacity of the electrode material. Common electrode materials in...

Claims

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Application Information

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IPC IPC(8): H01G11/36H01G11/86
CPCH01G11/36H01G11/86Y02E60/13
Inventor 孟凡成赵一昕徐斌
Owner GUANGDE TIANYUN NEW TECH
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