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Preparation method of carbon nanosheet, positive electrode material and preparation method thereof

A technology of carbon nanosheets and cathode materials, applied in the field of nanomaterials, can solve the problems of uncontrollable, high cost, and single shape, and achieve the effects of inhibiting volume expansion, low cost, and simple process

Inactive Publication Date: 2020-03-27
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a preparation method of carbon nanosheets, positive electrode materials and preparation methods thereof, aiming to solve the technical problems of single, uncontrollable and high cost of the existing preparation methods of carbon nanosheets

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  • Preparation method of carbon nanosheet, positive electrode material and preparation method thereof
  • Preparation method of carbon nanosheet, positive electrode material and preparation method thereof
  • Preparation method of carbon nanosheet, positive electrode material and preparation method thereof

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preparation example Construction

[0040] On the one hand, the embodiment of the present invention provides a method for preparing carbon nanosheets, the preparation method comprising the following steps:

[0041] S01: Provide aluminum source and 4,4'-biphenyl dicarboxylic acid;

[0042] S02: Dissolving the aluminum source and 4,4'-biphenyldicarboxylic acid in an organic solvent for heat treatment, followed by solid-liquid separation to obtain a self-assembled aluminum-based metal-organic framework;

[0043] S03: subjecting the Al-based metal-organic framework to carbonization treatment and acid treatment in sequence, and then drying to obtain carbon nanosheets.

[0044] In the preparation method of carbon nanosheets provided in the embodiments of the present invention, aluminum source and 4,4'-biphenyl dicarboxylic acid are dissolved in an organic solvent and heated to form a self-assembled aluminum-based metal-organic framework (Al-MOF). The aluminum-based metal-organic framework superstructure is used as a ...

Embodiment 1

[0054] (1) Preparation of Al-MOF-1 precursor:

[0055] Weigh 0.130842g Al(NO 3 ) 3 9H 2 O and 0.2828g 4,4'-biphenyldicarboxylic acid are placed in a beaker, 50ml of DMF solution is added, and the beaker is placed on a magnetic stirrer, stirred for 30min, and the fully stirred solution is transferred to a 20ml polytetrafluoroethylene bottle In the body, heated at 120°C for 24h, naturally cooled to room temperature, centrifuged to obtain a white precipitate, dried at 70°C-200°C and ground to obtain a white powder, which is a self-assembled aluminum-based metal-organic framework.

[0056] (2) Preparation of carbon nanosheets:

[0057] Put the above-mentioned Al-MOF1 precursor into a tube furnace, and carry out carbonization under the protection of Ar gas at 700°C. The heating rate is 5°C / min, and the constant temperature time is 1h. When the constant temperature is over, it is naturally cooled to room temperature. Put into hydrochloric acid solution (10wt%), ultrasonic 30min,...

Embodiment 2

[0061] (1) Preparation of Al-MOF-2 precursor:

[0062] Weigh 0.0651g Al(NO 3 )3 9H 2 O and 0.1401g 4,4'-biphenyldicarboxylic acid are placed in a beaker, 50ml of DMF solution is added, and the beaker is placed on a magnetic stirrer, stirred for 30min, and the fully stirred solution is transferred to a 10ml polytetrafluoroethylene bottle , heated at 120°C for 24 hours, naturally cooled to room temperature, centrifuged to obtain a white precipitate, dried at 70°C-200°C and ground to obtain a white powder.

[0063] (2) Preparation of carbon nanosheets:

[0064] Put Al-MOF2 into a tube furnace, carbonize under the protection of Ar gas at 700°C, the heating rate is 5°C / min, and the constant temperature time is 1h. When the constant temperature is over, it will naturally cool down to room temperature. solution (10wt%), sonicated for 30min, the mixture was sealed in an autoclave with a polytetrafluoroethylene liner at a constant temperature of 80°C for two days, finally centrifuge...

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Abstract

The invention belongs to the technical field of nanometer materials, and particularly relates to a preparation method of a carbon nanosheet, a positive electrode material and a preparation method of the positive electrode material. The preparation method of the carbon nanosheet comprises the following steps of providing an aluminum source and 4, 4 '-biphenyldicarboxylic acid; dissolving the aluminum source and 4, 4 '-biphenyldicarboxylic acid in an organic solvent for heating treatment, and then performing solid-liquid separation to obtain a self-assembled aluminum-based metal organic framework; and sequentially carrying out carbonization treatment and acid treatment on the aluminum-based metal organic framework, and then drying to obtain the carbon nanosheet. The preparation method is simple in process and low in cost, the finally obtained carbon nanosheet has a scaly surface structure, a hierarchical porous structure and an ultra-large specific surface area, the extra carbonaceous activation and template removal processes are not needed, and the carbon nanosheet can be compounded with selenium to serve as the positive electrode material of a lithium-selenium ion battery and has avery good application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method of carbon nanosheets, a positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices and electric vehicles due to their high specific energy, long cycle life and environmental friendliness. However, with the increase in the demand for lithium-ion batteries, the scarcity of the required lithium resources and the uneven geographical distribution have become increasingly prominent. Lithium-ion batteries based on graphite and intercalation compounds can no longer meet the needs of social development. Therefore, in recent years, the research and development of alternative lithium battery systems has attracted extensive attention from researchers. Among them, as an element in the same group as sulfur, selenium (Se) has a molecular structure si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/38H01M10/0525
CPCH01M4/38H01M4/587H01M10/0525H01M2004/028Y02E60/10
Inventor 曾燮榕金文武邹继兆S·因古瓦曾绍忠徐国忠
Owner SHENZHEN UNIV
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