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A kind of electrode material and supercapacitor

A kind of electrode material, composite material technology

Active Publication Date: 2019-09-24
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, supercapacitors using carbon materials as electrode materials have been restricted by electrical conductivity, and the energy density and specific capacity are low, which seriously restricts the application of supercapacitors.
[0004] The current main solution is to add conductive agents such as carbon black or carbon nanotubes during the electrode preparation process. However, this can only reduce the resistance between the material particles, and cannot effectively improve the conductivity of the electrode material, nor can it improve its energy. Properties such as density and specific capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1.1 Sample preparation:

[0049] Expandable graphite (provided by Qingdao Tianheda Graphite Co., Ltd.) is pulverized with a dry material pulverizer for 5 minutes and then 0.5 g is added to 100 ml of glucose solution with a concentration of 10 g / mL and mixed uniformly to obtain a mixture; The granulator sprays and granulates the above mixture to obtain a spherical precursor of carbon source-coated expandable graphite; the resulting precursor is heated to 900°C in an argon atmosphere for heat treatment, and then naturally cooled after 2 hours of heat preservation to obtain a carbon-coated A spherical composite material coated with expandable graphite; the spherical composite material coated with the gained carbon expandable graphite is added in a potassium hydroxide saturated solution (the mass ratio of the composite material to potassium hydroxide is 1:2), after drying, Heating and activating in an argon atmosphere, heating to 800°C and keeping it warm for 2 hours, cooli...

Embodiment 2

[0057] 1.1 Sample preparation:

[0058] After the expandable graphite is pulverized by a dry material pulverizer for 10 minutes, 1 g is added to 100 ml of glucose solution with a concentration of 20 g / mL and mixed evenly to obtain a mixture; the above mixture is sprayed and granulated by a spray drying granulator to obtain Spherical precursor of carbon source-coated expandable graphite; the resulting precursor was heated to 400°C in an argon atmosphere for heat treatment, kept for 3 hours and then cooled naturally to obtain a spherical composite material of carbon-coated expandable graphite; the obtained The spherical composite material of carbon-coated expandable graphite is added to a saturated solution of potassium hydroxide (the mass ratio of composite material to potassium hydroxide is 1:3), and after drying, it is heated and activated in an argon atmosphere, and heated to 800°C , keep warm for 4 hours, cool naturally, and then wash and dry the obtained product to obtain ...

Embodiment 3

[0065] 1.1 Sample preparation:

[0066] After the expandable graphite is crushed with a dry material pulverizer for 5 minutes, 0.5 g is added to 100 ml of CMC solution with a concentration of 100 g / mL and mixed uniformly to obtain a mixture; the above mixture is sprayed and granulated by a spray drying granulator, A spherical precursor of carbon source-coated expandable graphite was obtained; the resulting precursor was heated to 600°C in an argon atmosphere for heat treatment, and then naturally cooled after 8 hours of heat preservation to obtain a spherical composite material of carbon-coated expandable graphite; The spherical composite material of the obtained carbon-coated expandable graphite is added to a saturated solution of potassium hydroxide (the mass ratio of the composite material to potassium hydroxide is 1:4), and after drying, it is heated and activated under an argon atmosphere, and heated to 1000 ℃, keep warm for 6 hours, cool naturally, and then clean the obt...

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Abstract

The invention provides an electrode material and a supercapacitor. The electrode material is prepared as follows: (a), mixing expandable graphite with a carbon source solution to obtain a mixed material; (b), carrying out granulation on the mixed material to obtain a spherical precursor of carbon-source-coated expandable graphite; (c), carrying out heat treatment on the precursor to obtain a spherical composite material of the carbon-coated expandable graphite; and (d), mixing the spherical composite material of the carbon-coated expandable graphite with an activator solution and carrying out heating activation to obtain a spherical composite electrode material of the activated carbon-coated expandable graphite. The electrode material has advantages of large specific surface area, high electrical conductivity, high specific capacity, high energy density, and good overall performance.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to an electrode material and a supercapacitor. Background technique [0002] With the popularization and rapid development of various electronic products, the market's requirements for energy storage systems have gradually increased, and various energy storage devices have been more and more widely used and researched; among them, supercapacitors have good cycle life, fast Responsiveness, good stability, high power density and many other advantages are widely used in many fields such as new energy vehicles, military, communications and national grid. [0003] A supercapacitor includes a positive electrode, a negative electrode, a separator, and an electrolyte. Among them, the electrode materials of the positive and negative electrodes are an important part of the capacitor and play a vital role in the energy density and other performance of the supercapacitor. At present, the el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/34H01G11/30H01G11/86
Inventor 赵丹周旭峰刘兆平黄尚明张筱喆
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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