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Nitrogen-doped carbon nanosheet/MXene composite nanomaterial as well as preparation method and application thereof

A technology of composite nanomaterials and carbon nanosheets, applied in the field of electrochemical energy, can solve the problems that the electrochemical performance cannot be fully utilized, and achieve the effects of improving cycle stability, promoting pseudocapacitive characteristics, and overcoming stacking and accumulation

Active Publication Date: 2021-07-20
XIAN JIAOTONG LIVERPOOL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]Aiming at the stacking and accumulation of MXene nanosheets in the prior art, the electrochemical performance cannot be fully utilized

Method used

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  • Nitrogen-doped carbon nanosheet/MXene composite nanomaterial as well as preparation method and application thereof
  • Nitrogen-doped carbon nanosheet/MXene composite nanomaterial as well as preparation method and application thereof
  • Nitrogen-doped carbon nanosheet/MXene composite nanomaterial as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] S1, a flow chart for the preparation of nitrogen-doped carbon nanosheets / MXene composite nanomaterials figure 1 Shown, concrete preparation method comprises the following steps:

[0062] (1) According to the weight fraction, 4 parts of Ti 3 C 2 Mix well with 1 part of nickel acetate tetrahydrate, 20 parts of dihydrodiamine and 2 parts of sucrose, add a little (10 mL) deionized water to dissolve the mixture completely, stir well, and dry in vacuum at 60 °C for 48 hours to obtain MXene-containing powder shape mixture;

[0063] (2) Under the protection of argon gas flow, the mixture was preheated to 600°C, kept for 2 hours, then heated to 800°C, kept for 2 hours, cooled to room temperature, taken out, and carefully ground to obtain nitrogen-doped carbon nanosheets / MXene composite nano Material;

[0064] S2, a composite electrode sheet, and the preparation flow chart of using the composite electrode sheet to prepare a three-electrode system assembly is as follows figu...

Embodiment 2

[0072] S1, a preparation method of nitrogen-doped carbon nanosheet / MXene composite nanomaterial:

[0073] (1) According to the weight fraction, 3 parts of Ti 3 C 2 Mix well with 1 part of nickel acetate tetrahydrate, 20 parts of dihydrodiamine and 1 part of sucrose, add a little (10 mL) deionized water to dissolve the mixture completely, stir well, and dry in vacuum at 60 °C for 48 hours to obtain MXene-containing powder shape mixture;

[0074] Under the protection of argon gas flow, the mixture was preheated to 600°C, kept for 3 hours, then heated to 700°C, kept for 2 hours, cooled to room temperature, taken out, and carefully ground to obtain nitrogen-doped carbon nanosheets / MXene composite nanomaterials ;

[0075] S2, a preparation method of a composite electrode sheet comprises the following steps:

[0076] (3) Mix nitrogen-doped carbon nanosheets / MXene composite nanomaterials, conductive agent and polyvinylidene fluoride in a ratio of 8:1:1 by weight, then add N-methy...

Embodiment 3

[0083] The difference with Example 1 is that the weight fraction of dihydrodiamine described in step (1) is 40 parts;

[0084] Composite electrode sheets and supercapacitors are prepared in the same manner as in Example 1, and the electrochemical performance of the supercapacitor is tested by a battery testing instrument: the specific capacitance is about 334F / g at a scan rate of 5mV / s, and the scan rate is expanded to 100 After double (500mv / s), the specific capacitance is about 124F / g, the electrochemical cycle charge and discharge performance is stable, and the internal resistance is small.

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Abstract

The invention relates to a nitrogen-doped carbon nanosheet / MXene composite nanomaterial as well as a preparation method and application thereof. In the composite nanomaterial, the carbon nanosheets and the MXene form an interpenetrating lamellar structure, and the nitrogen element is doped in the carbon nanosheets and the MXene. The problem that the electrochemical performance cannot be fully utilized due to stacking and accumulation of MXene nanosheets in the prior art is solved. The composite material disclosed by the invention can effectively overcome the defects of self stacking and accumulation of MXene, and the cycling stability of the battery is greatly improved; redox reaction and pseudocapacitance active sites with obvious MXene lamellar spacing are increased, and the specific capacity of the supercapacitor is improved, the preparation process of the composite material is simple, and industrial practice is facilitated.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy, and specifically relates to a nitrogen-doped carbon nanosheet / MXene composite nanomaterial, its preparation method and application. Background technique [0002] Based on the rapid development of portable electronics and microelectronic devices, various energy storage technologies have emerged. Among them, flexible electrochemical capacitors (also known as supercapacitors) have great potential for commercialization due to high power density, fast charge-discharge, and long cycle life. Supercapacitors store electrochemical energy by absorbing ions in the electrolyte on the surface of electrode materials with a high specific surface area. Therefore, compared with batteries, it can store and transmit a large amount of charge in a short time. One of the main challenges in fabricating supercapacitor electrode sheets is excellent mechanical flexibility, and another challenge is to incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/36H01G11/86G01N27/416
CPCH01G11/26H01G11/36H01G11/86G01N27/416Y02E60/13Y02E60/10
Inventor 孙艺易若玮赵胤超刘晨光袁宇丹李韦萱杨莉赵策州
Owner XIAN JIAOTONG LIVERPOOL UNIV
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