Self-supporting carbon nanofiber loaded molybdenum disulfide composite material as well as preparation method and application thereof

A carbon nanofiber, molybdenum disulfide technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as shedding, poor cycle stability, battery performance degradation, etc., to avoid structural damage. , excellent electrical conductivity, avoid the effect of electrode preparation process

Inactive Publication Date: 2022-03-04
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The cathode material of the aluminum ion battery in the prior art uses a binder to bond the active material to the current collector. During the cycle, it will fall off, which will cause the performance of the battery to decline, and there is a problem of poor cycle stability.

Method used

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  • Self-supporting carbon nanofiber loaded molybdenum disulfide composite material as well as preparation method and application thereof
  • Self-supporting carbon nanofiber loaded molybdenum disulfide composite material as well as preparation method and application thereof
  • Self-supporting carbon nanofiber loaded molybdenum disulfide composite material as well as preparation method and application thereof

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preparation example Construction

[0025] The invention provides a kind of preparation method of self-supporting carbon nanofiber loaded molybdenum disulfide composite material, comprising the following steps:

[0026] Will (NH 4 ) 2 MoS 4 The powder is dissolved in N,N-dimethylformamide and then polyacrylonitrile is added to obtain an electrospinning precursor;

[0027] Spinning and jetting the electrospinning precursor to obtain fibers;

[0028] Pre-oxidizing the fiber in an air atmosphere to obtain a pre-oxidation product;

[0029] The preoxidized product was placed in Ar-H 2 Reduction is carried out in a mixed atmosphere to obtain a reduction product;

[0030] The reduction product is carbonized in an inert atmosphere to obtain the self-supporting flexible carbon nanofiber supported molybdenum disulfide composite material.

[0031] The present invention will (NH 4 ) 2 MoS 4 The powder is dissolved in N,N-dimethylformamide and then polyacrylonitrile is added to obtain an electrospinning precursor. ...

Embodiment 1

[0052] Step 1: Self-supporting flexible carbon nanofibers loaded MoS 2 Preparation of composite materials

[0053] Preparation of electrospinning precursors:

[0054] Will (NH 4 ) 2 MoS 4 After grinding into a micron-level (below 100 micron) powder with an agate mortar, weigh (NH 4 ) 2 MoS 4 Dissolved in N,N-dimethylformamide solution, after fully dissolved, add polyacrylonitrile (Mw=120,000) to prepare electrospinning precursor, (NH 4 ) 2 MoS 4 The mass ratio to polyacrylonitrile is 0.5:1, the concentration of the electrospinning precursor is 8%, and the electrospinning precursor is obtained after magnetic stirring at 50° C. for 8 hours.

[0055] Electrospinning process:

[0056] The prepared electrospinning precursor was sucked into a 10 mL medical syringe, and a needle with a diameter of 1.6 mm was used for spinning jet. The electrospinning voltage was 20KV, the distance between the needle and the receiving plate was 15cm, and the advancing speed was 10μL / min.

...

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Abstract

The invention provides a self-supporting carbon nanofiber loaded molybdenum disulfide composite material as well as a preparation method and application thereof, and belongs to the field of aluminum ion batteries. According to the preparation method, (NH4) 2MoS4 is directly utilized for reduction to generate MoS2, the MoS2 has the unique property of flexible self-supporting and can be directly used as an electrode, the phenomena that the conductivity is reduced, high temperature resistance is not high, and active substances fall off in the circulation process due to a tedious electrode preparation process and the use of a binder are avoided, the carbon nanofibers can be used as a supporting substrate of molybdenum sulfide, and the preparation method is simple and convenient. According to the present invention, in the charge-discharge cycle process, the structure damage of molybdenum sulfide in the cycle process can be avoided, the cycle performance is stable, the unique embedding structure of molybdenum disulfide in the carbon nanofiber is provided, the embedding and the de-embedding of aluminum ions in the battery charge-discharge process are easily achieved, and the practical application can be met.

Description

[0001] This application is a divisional application with an application date of January 11, 2019, an application number of 201910026673.7, and an invention title of "A self-supporting carbon nanofiber-supported molybdenum disulfide composite material and its preparation method and application". technical field [0002] The invention belongs to the technical field of aluminum ion batteries, and in particular relates to a self-supporting carbon nanofiber loaded molybdenum disulfide composite material and a preparation method and application thereof. Background technique [0003] Due to the limited reserves, high price, flammability and explosion of lithium metal, there is a need for a low-cost, safe rechargeable battery to replace lithium-ion batteries. As a metal with abundant reserves, its price is far lower than that of lithium, and its safety is high. Therefore, aluminum-ion batteries have become a very promising alternative to lithium-ion batteries. Since the advent of al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCH01M4/362H01M4/5815H01M4/625H01M10/054B82Y30/00Y02E60/10
Inventor 卢惠民杨文文曹媛胡雪琦
Owner BEIHANG UNIV
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