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Nano-hybrid airgel supercapacitor electrode material and its preparation method and application

A technology for supercapacitors and electrode materials, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors. It can solve the problems of impossibility, low capacitance of graphene carbon materials, and difficult diffusion of electrolyte ions, etc., to improve performance, The effect of excellent electrochemical performance and tough skeleton structure

Active Publication Date: 2019-07-02
BEIJING INSTITUTE OF TECHNOLOGYGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene, as a unique carbon nanomaterial, has a large theoretical specific surface area (about 2600m 2 g -1 ), high electrical conductivity, excellent mechanical flexibility, and good chemical stability, which make graphene carbon materials have good application potential in supercapacitor electrode materials, but the capacitance of graphene carbon materials is relatively lower; layered MoS 2 Due to the layered structure of graphene-like sheets, it can provide a large specific surface area for electric double layer charge storage, so it can be used as an electrode material for capacitors, but it is still very limited when used as an energy storage material alone in supercapacitors. For this purpose, the MoS can be 2 Combining nanosheets and graphene to prepare composite materials
[0004] However, in the prior art, due to the strong π-π interaction between graphene nanosheets, MoS 2 And agglomeration is very easy to occur, which makes the diffusion of electrolyte ions in the prepared macroscopic electrode materials difficult or even impossible.

Method used

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  • Nano-hybrid airgel supercapacitor electrode material and its preparation method and application
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  • Nano-hybrid airgel supercapacitor electrode material and its preparation method and application

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Effect test

Embodiment 1

[0037] The first step: 1) Weigh 0.05g of TEMPO, add 0.5g of NaBr into 400mL of deionized water in sequence, and stir the above mixture fully with a magnetic stirrer at 10°C; 2) After TEMPO and NaBr are completely dissolved, add Add 10g of wood pulp cellulose that has never been dried in the reaction system; 3) Stir vigorously after the wood pulp cellulose is uniformly dispersed, then add 70g of NaClO to the system, and react by continuously dripping 0.5mol / L NaOH solution The pH of the system is controlled at about 10, until the pH remains substantially constant, and the reaction ends; 4) Wash 3-5 times with deionized water to obtain oxidized cellulose, and then use deionized water to prepare oxidized cellulose into 2 mg / ml slurry, in an ice-water bath, oxidized cellulose was peeled into cellulose nanofibers by ultrasonication at 300W for 20min, and then the prepared cellulose nanofiber suspension was centrifuged at 10000r for 20min to remove unstripped oxidized cellulose, and ...

Embodiment 2

[0045] The first step: 1) Weigh 0.05g of TEMPO, add 0.5g of NaBr into 400mL of deionized water in sequence, and stir the above mixture fully with a magnetic stirrer at 10°C; 2) After TEMPO and NaBr are completely dissolved, add Add 10g of wood pulp cellulose that has never been dried in the reaction system; 3) Stir vigorously after the wood pulp cellulose is uniformly dispersed, then add 70g of NaClO to the system, and react by continuously dripping 0.5mol / L NaOH solution The pH of the system is controlled at about 10, until the pH remains basically unchanged, and the reaction ends; 4) Wash 3-5 times with deionized water to obtain oxidized cellulose, and then use deionized water to prepare oxidized cellulose into 2 mg / ml slurry, in an ice-water bath, oxidized cellulose was peeled into cellulose nanofibers by ultrasonication at 300W for 20min, and then the prepared cellulose nanofiber suspension was centrifuged at 10000r for 20min to remove unstripped oxidized cellulose, and Th...

Embodiment 3

[0053] The first step: 1) Weigh 0.05g of TEMPO, add 0.5g of NaBr into 400mL of deionized water in sequence, and stir the above mixture fully with a magnetic stirrer at 10°C; 2) After TEMPO and NaBr are completely dissolved, add Add 10g of wood pulp cellulose that has never been dried in the reaction system; 3) Stir vigorously after the wood pulp cellulose is uniformly dispersed, then add 70g of NaClO to the system, and react by continuously dripping 0.5mol / L NaOH solution The pH of the system is controlled at about 10, until the pH remains basically unchanged, and the reaction ends; 4) Wash 3-5 times with deionized water to obtain oxidized cellulose, and then use deionized water to prepare oxidized cellulose into 2 mg / ml slurry, in an ice-water bath, oxidized cellulose was peeled into cellulose nanofibers by ultrasonication at 300W for 20min, and then the prepared cellulose nanofiber suspension was centrifuged at 10000r for 20min to remove unstripped oxidized cellulose, and Th...

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Abstract

The invention relates to a nano-hybrided aerogel supercapacitor electrode material and a preparation method and an application thereof. The nano-hybrided aerogel supercapacitor electrode material provided by the invention comprises cellulose nanofibers, molybdenum disulfide and reduction oxidization graphene. By taking NCF, prepared by a TEMPO catalytic oxidization method, as a base material, irreversible auto-deposition and MoS<2> agglomeration of a graphene nanosheet layer can be prevented effectively; performance of a macroscopic electrode material wetted by electrolyte is improved, mesoporous utilization ratio in the macroscopic electrode material is improved, and the cellulose nanofibers after being adsorbed with electrolyte can be seen as 1D nanoscale electrolyte storage place, so that the diffusion distance of electrolyte ions can be greatly shortened; the aerogel product has a tough framework structure, relatively low density and large specific surface area, so that transport of electrolyte ions and charges can be facilitated; and in addition, the product has excellent electrochemical performance and high application prospect in the energy field.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy materials, and in particular relates to a cellulose nanofiber-based nano-hybrid airgel supercapacitor electrode material and its preparation method and application. Background technique [0002] Airgel (English name Aerogel, also known as xerogel) is that the gel removes most of the solvent, so that the liquid content in the gel is much less than the solid content, or the medium filled in the space network structure of the gel is Gas, solid appearance. Aerogels have the characteristics of high porosity, large specific surface area, low density, and excellent thermal insulation, and their application prospects are very broad. [0003] In the field of electrochemical energy storage, graphene and MoS 2 (Molybdenum disulfide) has become a research hotspot in this field because of its high specific surface area and general electronic structure. Graphene, as a unique carbon nanomateria...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/86
CPCY02E60/13
Inventor 邵自强吕妍妍周逸周家贵范宗清王飞俊王建全王文俊
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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