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Self-supporting carbon nanofiber load molybdenum disulfide composite material, and preparation method and application thereof

A technology of carbon nanofibers and molybdenum disulfide, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor cycle stability, battery performance degradation, and shedding

Inactive Publication Date: 2019-05-10
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 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 load molybdenum disulfide composite material, and preparation method and application thereof
  • Self-supporting carbon nanofiber load molybdenum disulfide composite material, and preparation method and application thereof
  • Self-supporting carbon nanofiber load molybdenum disulfide composite material, and preparation method and application thereof

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preparation example Construction

[0032] The invention provides a kind of preparation method of self-supporting carbon nanofiber loaded molybdenum disulfide composite material, comprising the following steps:

[0033] Will (NH 4 ) 2 MoS 4 The powder is dissolved in N,N-dimethylformamide and then polyacrylonitrile is added to obtain an electrospinning precursor;

[0034] Spinning and jetting the electrospinning precursor to obtain fibers;

[0035] Pre-oxidizing the fiber in an air atmosphere to obtain a pre-oxidation product;

[0036] The preoxidized product was placed in Ar-H 2 Reduction is carried out in a mixed atmosphere to obtain a reduction product;

[0037] The reduction product is carbonized in an inert atmosphere to obtain the self-supporting flexible carbon nanofiber supported molybdenum disulfide composite material.

[0038] 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

[0059] Step 1: Self-supporting flexible carbon nanofibers loaded MoS 2 Preparation of composite materials

[0060] Preparation of electrospinning precursors:

[0061] 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.

[0062] Electrospinning process:

[0063] 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 load molybdenum disulfide composite material, and a preparation method and application thereof, and belongs to the field of aluminum ion batteries. (NH4)2MoS4 is directly reduced to generate MoS2, the self-supporting carbon nanofiber load molybdenum disulfide composite material has the peculiar property of flexible self supporting and can be directly used as an electrode, a complex electrode preparation technology is avoided, phenomena that electrical conductivity is lowered, the material can not resist high temperatures and active substances fall in a circulation process since an electrode preparation technology is complex and binder is used are avoided, and the carbon nanofiber can be used as the supporting substrate of molybdenumsulfide. In a charging and discharging circulation process, a situation that the structure of molybdenum sulfide is damaged in a circulation process can be avoided, cycle performance is stable, meanwhile, the material has the unique mosaic structure of molybdenum disulfide in the carbon nanofiber, is very favorable for the embedding and the disembedding of aluminum ions in a battery charging anddischarging process, and can meet practical application.

Description

technical field [0001] 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 [0002] 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 aluminum-ion batteries, the main constraint is the lack of suitable cathode materials. Aluminum-ion batteries meet the requirements for cathode materials in practical applications: 1) low cost and simple process flow. 2) High specific volume. 3) Good cycle stability. 4) Good rate performance, su...

Claims

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Application Information

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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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