Carbon quantum dot and graphene composite material, and preparation method and application thereof

A technology of carbon quantum dots and composite materials, which is applied in the field of carbon quantum dots and graphene composite materials and their preparation, and can solve problems such as limited development and graphite layer exfoliation

Inactive Publication Date: 2021-10-01
福建海峡石墨烯产业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in graphite-based cathodes, such as large volume expansion, decomposition of traditional electrolytes caused by high potentials, and severe exfoliation of graphite layers during insertion, etc., which greatly limit their development.

Method used

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  • Carbon quantum dot and graphene composite material, and preparation method and application thereof
  • Carbon quantum dot and graphene composite material, and preparation method and application thereof
  • Carbon quantum dot and graphene composite material, and preparation method and application thereof

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Experimental program
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Embodiment 1

[0047] 1. Preparation of CQD / CF composites

[0048] S01, mixing of raw materials and preparation of precursors;

[0049] Analytical grade, A.R, 99.5% anhydrous citric acid and analytical grade, A.R, 98% iron trioxide (FeCl 3 ·6H 2 O) Mix it into distilled water at a mass ratio of 1:1.25 to form a uniform slurry, and dry the slurry at 120°C in a vacuum to fully volatilize the water;

[0050] S02, iron atom catalytic treatment process;

[0051] The resulting mixture was put into a tube furnace for pre-carbonization at 600 °C, followed by calcination at a high temperature of 1100 °C for 5 h in an Ar atmosphere, and finally at 2 °C min -1 The cooling rate cools the furnace;

[0052] S03, acid leaching treatment to remove iron;

[0053] The synthesized powder material was immersed in 1M hydrochloric acid (HCl) for 24 h to remove iron, then repeated washing, filtering several times and fully drying to obtain CQD / CF composites.

[0054] 2. Preparation of hybrid potassium double...

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Abstract

The invention provides a carbon quantum dot and graphene composite material, and a preparation method and an application thereof. The CQD / CF composite material is synthesized by taking anhydrous citric acid as a carbon source and ferric trichloride hexahydrate as a catalyst through a simple and convenient catalytic graphite method; the CQD / CF composite material is composed of a large-specific-surface-area ultrathin graphene-shaped carbon plate and a large number of carbon quantum dots, and porous structures are distributed on the surface of the graphene-shaped carbon plate; the carbon quantum dots are distributed on the graphene-shaped carbon plate; and according to the mixed potassium double-ion capacitor, the carbon quantum dot and graphene composite material is used as a positive electrode, nano-graphite is used as a battery behavior negative electrode, 0.8 M potassium hexafluorophosphate KPF6 is used as an electrolyte, and cellulose paper is used as a diaphragm. The preparation method is simple, and the obtained carbon quantum dot and graphene composite material has excellent an anion storage capacity, excellent structural stability and excellent capacitor performance.

Description

【Technical field】 [0001] The invention relates to the fields of positive electrode materials for potassium ion batteries and potassium double ion capacitors, in particular to a carbon quantum dot and graphene composite material and a preparation method and application thereof. 【Background technique】 [0002] With the increasing demand for clean, renewable and sustainable energy, energy storage devices with high energy, high power and long cycle life have attracted much attention. In current energy storage systems, hybrid lithium-ion capacitors (HLICs) are promising to straddle the boundary between supercapacitors and batteries with acceptable power and energy densities, thus receiving increasing scientific attention. However, the development of HLICs has been greatly hindered by geographical constraints and the rising cost of lithium resources. It is well known that the chemical properties of potassium are similar to those of lithium, so the technology of hybrid lithium-ion...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M10/054H01G11/36H01G11/50H01G11/86
CPCH01M4/583H01M10/054H01G11/36H01G11/50H01G11/86H01M2004/028Y02E60/10
Inventor 刘朝孟鲁兵安
Owner 福建海峡石墨烯产业技术研究院有限公司
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