Material for lithium-sulfur battery positive electrode and preparation method thereof

A lithium-sulfur battery and positive electrode technology, applied in the field of lithium-sulfur battery positive electrode materials and its preparation, can solve the problems of reducing the electrochemical performance of composite materials, the inability to synthesize composite materials with high efficiency, and reducing the tap density, so as to improve Coulombic efficiency and cycle stability, good cycle stability and Coulombic efficiency, the effect of reducing volume expansion

Pending Publication Date: 2020-07-31
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are some defects in the composite method, for example: the high-energy ball milling method can only pulverize the elemental sulfur to the submicron scale, and cannot be in good contact with carbon; the sulfur may agglomerate in the high-temperature heat treatment method; the gas-phase loading method has higher requirements for the instrument , poor experimental consistency and other shortcomings
[0005] At present, the carbon-coated mesoporous vanadium nitride nanowire film in the prior art reduces its tap density to a certain extent, so that the energy density will decrease; it is only formed by interweaving carbon-coated mesoporous vanadium nitride nanowires The thin film has poor electrical conductivity and mechanical properties; it is easy to cause structural damage during the electrochemical reaction, thereby reducing the electrochemical performance of the composite material
In addition, the preparation process has a long cycle and cannot synthesize composite materials efficiently

Method used

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  • Material for lithium-sulfur battery positive electrode and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0031] The material used for the positive electrode of the lithium-sulfur battery is a self-supporting mesoporous vanadium nitride nanowire / carbon nanotube composite material with a three-dimensional independent network structure.

[0032] The preparation method of described material comprises the following steps:

[0033] (1) Preparation of vanadium oxide nanowires: first, 0.1 g of ammonium metavanadate with a purity of 99% was added to 40 mL of deionized water, stirred to form a uniform dispersion solution; then nitric acid was added dropwise to adjust the pH value of the dispersion solution to 2, and Stir at room temperature for 1 hour and transfer to a high-pressure reactor with a capacity of 60 mL and heat at 180°C for 24 hours to react. After the reaction is completed, the reaction kettle is naturally cooled to room temperature, and the precipitate obtained from the reaction is repeatedly washed with deionized water and ethanol. 3 times, drying at 80°C for 12 hours under...

Embodiment 2

[0037] The preparation method of described material comprises the following steps:

[0038](1) Preparation of vanadium oxide nanowires: first, 0.3 g of ammonium metavanadate was added to 80 mL of deionized water, and stirred to form a uniform dispersion solution; then nitric acid was added dropwise to adjust the pH value of the dispersion solution to 3, stirred at room temperature for 2 h and Transfer to the reaction kettle and heat at 190°C for 24 hours to react. After the reaction is completed, the reaction kettle is naturally cooled to room temperature, and the precipitate obtained from the reaction is repeatedly washed with deionized water and ethanol for 5 times, and dried under vacuum at 60°C. 12h, the vanadium oxide nanowires were obtained;

[0039] (2) Preparation of mesoporous vanadium nitride nanowires: the vanadium oxide nanowires obtained in step (1) are placed in a flow rate of 30 sccmNH 3 Heated to 550°C at a heating rate of 3°C / min in a tube furnace for reactio...

Embodiment 3

[0042] The preparation method of described material comprises the following steps:

[0043] (1) Preparation of vanadium oxide nanowires: first, 0.2 g of ammonium metavanadate was added to 60 mL of deionized water, stirred to form a uniform dispersion solution; then nitric acid was added dropwise to adjust the pH value of the dispersion solution to 2, stirred at room temperature for 2 h and Transfer to a reaction kettle and heat at 170°C for 24 hours to react. After the reaction is completed, the reaction kettle is naturally cooled to room temperature, and the precipitate obtained from the reaction is repeatedly washed with deionized water and ethanol for 4 times, and dried under vacuum at 70°C. 12h, the vanadium oxide nanowires were obtained;

[0044] (2) Preparation of mesoporous vanadium nitride nanowires: the vanadium oxide nanowires obtained in step (1) are placed in a flow rate of 30 sccmNH 3 Heated to 550°C at a heating rate of 4°C / min in a tube furnace for reaction, an...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a material for a lithium-sulfur battery positive electrode and a preparation method of the material. The material is a self-supporting mesoporous vanadium nitride nanowire / carbon nanotube composite material with a three-dimensional network structure. According to the material, the vanadium nitridenanowire with the mesoporous structure is connected with the carbon nanotube to form the self-supporting three-dimensional network structure; the material has high conductivity, ultrahigh specific surface area and excellent mechanical properties; and the method is simple, effective and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a material for the positive electrode of lithium-sulfur batteries and a preparation method thereof. Background technique [0002] In the high-tech era, the demand for high-energy storage devices is increasing. Lithium-sulfur batteries are known for their extremely high theoretical energy density (2500Wh·kg -1 ) become one of the most promising rechargeable batteries. Lithium-sulfur battery is a battery system with metallic lithium as the negative electrode and elemental sulfur as the positive electrode. The sulfur positive electrode usually chooses an appropriate mixing ratio of active materials, conductive agents and binders; at the same time, due to the natural abundance of sulfur, low cost and environmental The advantages such as friendliness have made lithium-sulfur batteries arouse great interest in the academic circle in recent years. [0003]...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/052C01B21/06C01B32/168B82Y30/00
CPCH01M4/625H01M4/628H01M10/052C01B21/0617C01B32/168B82Y30/00C01P2004/80C01P2006/40H01M2004/021H01M2004/028Y02E60/10
Inventor 王新刘加兵
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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