Elm-shaped molybdenum diselenide@nitrogen-doped carbon nanofiber and preparation method and application thereof

A molybdenum diselenide, nitrogen-doped carbon technology, applied in secondary batteries, electrochemical generators, active material electrodes, etc., can solve problems such as low specific capacity, achieve high specific capacity, improve cycle stability, maintain The effect of structural stabilization

Inactive Publication Date: 2020-06-09
易航时代(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the use of molybdenum diselenide as the positive electrode material of aluminum ion batteries has the problem of low specific capacity

Method used

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  • Elm-shaped molybdenum diselenide@nitrogen-doped carbon nanofiber and preparation method and application thereof
  • Elm-shaped molybdenum diselenide@nitrogen-doped carbon nanofiber and preparation method and application thereof
  • Elm-shaped molybdenum diselenide@nitrogen-doped carbon nanofiber and preparation method and application thereof

Examples

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preparation example Construction

[0040] The invention provides a method for preparing elm-shaped molybdenum diselenide@nitrogen-doped carbon nanofibers, comprising the following steps:

[0041] mixing polyacrylonitrile and N,N-dimethylformamide to obtain a precursor solution;

[0042] Electrospinning the precursor solution to obtain a flexible film;

[0043] heat-treating the flexible film to obtain nitrogen-doped carbon nanofibers;

[0044] Mixing the nitrogen-doped carbon nanofibers, the molybdenum source precursor and the selenium source precursor and performing a hydrothermal reaction to obtain a hydrothermal product;

[0045] The hydrothermal product is heat-treated in nitrogen to obtain the elm-shaped molybdenum diselenide@nitrogen-doped carbon nanofiber.

[0046] The invention mixes polyacrylonitrile and N,N-dimethylformamide to obtain a precursor solution. In the present invention, the mass ratio of the polyacrylonitrile to N,N-dimethylformamide is preferably 0.5-0.8:5-8. In the present invention,...

Embodiment 1

[0067] Step 1: Sample Preparation

[0068] Preparation of nitrogen-doped carbon nanofibers:

[0069] Dissolve 0.5g of polyacrylonitrile (Mw=130,000~150,000) in 5g of N,N-dimethylformamide solvent, and stir magnetically at 40°C for 10h to form a uniform and transparent solution, which is used as the precursor of nitrogen-doped carbon nanofibers Electrospinning from bulk solution. During the electrospinning process, the specific experimental parameters ranged as follows: the voltage was 18KV, the distance between the needle and the receiving plate was 15cm, the advancing speed was 10μL / min, the temperature was 35°C, and the humidity was 40%. After the electrospinning is completed, the white flexible film is peeled off from the receiving plate and subjected to heat treatment. During the heat treatment, the steps of pre-oxidation stabilization, carbonization and nitrogen doping are completed. First, the electrospun film was pre-oxidized and stabilized for 2 hours in an air atmos...

Embodiment 2

[0095] Step 1: Sample Preparation

[0096] Nitrogen-doped carbon nanofibers were prepared in the same steps as in Example 1 as a molybdenum diselenide hydrothermal growth substrate. Mix 0.05g of nitrogen-doped carbon nanofibers with molybdenum diselenide precursor, wherein the molybdenum diselenide precursor is a mixture of 2mmol sodium molybdate dihydrate dissolved in 50mL deionized water and 4mmol selenium powder dissolved in 10mL hydrazine hydrate solution. Compared with Example 1, the amount of nitrogen-doped carbon nanofiber substrate in Example 2 was halved. During the hydrothermal growth process of molybdenum diselenide, since carbon nanofibers are used as its growth substrate, molybdenum diselenide will be evenly loaded on the carbon substrate, and the amount of substrate will affect the loading effect, thereby affecting the electrochemical performance. In Example 2, the mass fraction of molybdenum diselenide is 91.27%, and the atomic percentage of nitrogen is 2.06%....

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Abstract

The invention provides an elm-shaped molybdenum diselenide@nitrogen-doped carbon nanofiber and a preparation method and application thereof, which belong to the field of ion batteries. The nitrogen-doped carbon nanofiber flexible film is prepared through electrostatic spinning and heat treatment and is used as a matrix; through hydrothermal reaction, the nitrogen-doped carbon nanofiber is coated with elm-shaped molybdenum diselenide nanosheets in situ to form a core-shell structure; a special nano structure of molybdenum diselenide has a high-activity specific surface area; aluminum storage efficiency can be improved, high specific capacity is obtained, the nitrogen-doped carbon nanofibers form a three-dimensional conductive network; a rapid electron transfer capability is provided for high-rate charging and discharging, high-power discharging and rapid charging are achieved, the three-dimensional porous nitrogen-doped carbon nanofibers can buffer stress generated in the charging and discharging cycle process, deformation of the active material is reduced, the structural stability of the active material is kept, and the cycle stability of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of ion batteries, in particular to a coin-like molybdenum diselenide@nitrogen-doped carbon nanofiber and its preparation method and application. Background technique [0002] With the development of the economy and the improvement of living standards, the demand for electric vehicles and portable electronic devices has increased accordingly. Currently, electric vehicles and portable electronic devices rely primarily on lithium-ion batteries as their power source. However, due to limited lithium resources and rising prices, on the one hand, the cost of lithium-ion batteries has increased, and on the other hand, the sustainability of its supply is also worrying. Therefore, the development of low-cost, high-storage metal-ion batteries as an alternative or supplement to lithium-ion batteries has become a research hotspot. Aluminum has abundant reserves and low price. From the perspective of sustainable develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/366H01M4/583H01M4/581H01M10/054H01M2004/028Y02E60/10
Inventor 卢惠民杨文文曹媛
Owner 易航时代(北京)科技有限公司
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