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Preparation method and application of single crystal mesoporous Mo3N2 for positive electrode material of lithium-sulfur battery

A technology for lithium-sulfur batteries and cathode materials, applied in nanotechnology for materials and surface science, battery electrodes, lithium batteries, etc., can solve problems such as high conductivity and reduce electrode kinetics, and achieve increased sulfur loading, Effects of overcoming low utilization rates, high yields and industrial viability

Inactive Publication Date: 2020-08-04
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

These metal oxides generally have high electrical conductivity, reducing electrode kinetics

Method used

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  • Preparation method and application of single crystal mesoporous Mo3N2 for positive electrode material of lithium-sulfur battery
  • Preparation method and application of single crystal mesoporous Mo3N2 for positive electrode material of lithium-sulfur battery

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Embodiment 1

[0025] The first step: preparation of single crystal molybdenum oxide nanowires;

[0026] Ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 o 24 4H 2 O, (99%, Sigma Aldrich) dissolved in 5M HNO 3 (70%, Sigma Aldrich), stirring was continued at 20°C for half an hour, then at 150°C for 2 hours. After the hydrothermal process, the generated precipitate is cooled to room temperature, washed with ethanol and distilled water, and then filtered with a filter device. Molybdenum oxide nanowires were obtained by drying in an oven at 50°C.

[0027] The second step: preparation of single crystal mesoporous molybdenum nitride nanowires,

[0028] The single crystal molybdenum oxide nanowires prepared in the first step were loaded into a quartz boat, which was placed in a glass quartz tube in a cylindrical furnace, heated at 600 °C for half an hour, and then heated in NH at a flow rate of 100 mL / min. 3 Hold for 2 hours. sample in flowing NH 3 Cooled to room temperature, passivated in...

Embodiment 2

[0030] The first step: preparation of single crystal molybdenum oxide nanowires;

[0031] Ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7o 24 4H 2 O, (99%, Sigma Aldrich) dissolved in 5M HNO 3 (70%, Sigma Aldrich), stirring was continued at 25°C for 1 hour, then at 160°C for 3 hours. After the hydrothermal process, the generated precipitate is cooled to room temperature, washed with ethanol and distilled water, and then filtered with a filter device. Molybdenum oxide nanowires were obtained by drying in an oven at 50°C.

[0032] The second step: preparation of single crystal mesoporous molybdenum nitride nanowires,

[0033] Load the single-crystal molybdenum oxide nanowires prepared in the first step into a quartz boat, which is placed in a glass-quartz tube in a cylindrical furnace, heated at 700 °C for 1 hour, and then heated in NH at a flow rate of 100 mL / min. 3 Hold for 3 hours. sample in flowing NH 3 Cooled to room temperature, passivated in ammonia containing 1...

Embodiment 3

[0037] The first step: preparation of single crystal molybdenum oxide nanowires;

[0038] Ammonium molybdate tetrahydrate ((NH 4 )6Mo 7 o 24 4H 2 O, (99%, Sigma Aldrich) dissolved in 5M HNO 3 (70%, Sigma Aldrich), stirring was continued at 30°C for 1.5 hours, then at 170°C for 4 hours. After the hydrothermal process, the generated precipitate is cooled to room temperature, washed with ethanol and distilled water, and then filtered with a filter device. Molybdenum oxide nanowires were obtained by drying in an oven at 50°C.

[0039] The second step: preparation of single crystal mesoporous molybdenum nitride nanowires,

[0040] The single-crystal molybdenum oxide nanowires prepared in the first step were loaded into a quartz boat, which was placed in a glass-quartz tube in a cylindrical furnace, heated at 800 °C for 1.5 h, and then heated in NH at a flow rate of 100 mL / min. 3 Hold for 4 hours. sample in flowing NH 3 Cooled to room temperature, passivated in ammonia cont...

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Abstract

The invention relates to a preparation method of single-crystal mesoporous Mo3N2 for a positive electrode material of a lithium-sulfur battery, wherein the preparation method comprises the steps: preparing a single-crystal MoO3 nanowire by a hydrothermal method, and preparing a single-crystal mesoporous Mo3N2 nanostructure with high specific surface area by a topological reaction method by using the single-crystal MoO3 nanowire as a starting material. Molybdenum nitride has a large number of pores, the sulfur loading capacity is improved, and the shuttle effect is inhibited. The molybdenum nitride effectively solves the problem of the volume expansion effect of the lithium-sulfur battery while significantly improving the sulfur loading capacity of the positive electrode material. Non-toxicreactants and a hydrothermal method and a topological reaction method which are simple to operate are adopted, and non-toxic and harmless sublimed sulfur powder is loaded for preparing the positive electrode material of the lithium-sulfur battery, so that the method has remarkable advantages in the aspects of environmental protection, industrial production, products and application.

Description

technical field [0001] The present invention relates to active material, specifically a kind of single-crystal mesoporous Mo used for lithium-sulfur battery cathode material 3 N 2 method of preparation. Background technique [0002] Due to the limited discharge capacity of traditional lithium-ion batteries, especially in the field of electric vehicles, they can no longer meet the new requirements of the development of green industries. In this context, it is important to consider new active materials to build more efficient and cheaper energy storage systems. Compared with lithium-ion batteries, lithium-sulfur batteries have the advantages of low cost, high energy density, and superior performance. Elemental sulfur has the highest specific capacity. In lithium-sulfur batteries, its theoretical specific capacity is as high as 1675mAh / g, and its theoretical specific energy is 2600Wh / kg, which is higher than that of LiCoO in traditional lithium-ion batteries. 2 Waiting for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/10C30B29/16C30B33/00C30B29/38C30B29/60C01B21/06H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B21/062C30B7/10C30B29/16C30B29/38C30B29/60C30B33/00H01M4/628H01M10/052H01M2004/021Y02E60/10
Inventor 王新冯新
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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