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Cobalt selenide/nitrogen-doped carbon composite material and preparation method and application thereof

A nitrogen-doped carbon and composite material technology, applied in the field of nanomaterials, can solve the problems of low Coulombic efficiency and poor battery cycle stability, and achieve the effects of enriching active sites, improving battery cycle stability, and shortening ion transport paths.

Active Publication Date: 2018-12-18
XIAMEN UNIV OF TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cobalt selenide will produce a large volume change during the charge-discharge cycle, resulting in poor cycle stability and low coulombic efficiency of the battery.

Method used

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  • Cobalt selenide/nitrogen-doped carbon composite material and preparation method and application thereof
  • Cobalt selenide/nitrogen-doped carbon composite material and preparation method and application thereof
  • Cobalt selenide/nitrogen-doped carbon composite material and preparation method and application thereof

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preparation example Construction

[0026] A method for preparing a cobalt selenide / nitrogen-doped carbon composite material provided by an embodiment of the present invention comprises the following steps:

[0027] S1, preparing the precursor: after mixing the cobalt salt solution and the imidazole compound solution, stirring and reacting at room temperature to obtain a precursor (ZIF-L) with a two-dimensional leaf-shaped cobalt-based zeolite imidazolate skeleton structure;

[0028] Further, the cobalt salt solution is formed by dissolving one or more of cobalt nitrates, sulfates, halides, formates in the first solvent. The imidazole compound solution is formed by dissolving the imidazole compound in the second solvent, and the imidazole compound is selected from 2-methylimidazole, 2-ethylimidazole, 2-nitroimidazole, 2-formyl imidazole and any of the derivatives. The first solvent and the second solvent are selected from one or more of ethanol, water and ether.

[0029] In a preferred embodiment of the presen...

Embodiment 1

[0044] A cobalt selenide / nitrogen-doped carbon composite material (CoSe / CN-L) provided in this embodiment is prepared according to the following steps:

[0045] (1) Weigh cobalt nitrate hexahydrate and dissolve it in deionized water to make 2mmol / L cobalt nitrate hexahydrate solution, place the cobalt nitrate hexahydrate solution on a magnetic stirrer and stir at medium speed for 5min at room temperature to fully dissolve it .

[0046] (2) Weigh 2-methylimidazole and dissolve it in deionized water to prepare a 13.5 mmol / L 2-methylimidazole solution, which is also magnetically stirred at room temperature for 5 minutes.

[0047] (3) Pour the cobalt nitrate hexahydrate solution into the stirred 2-methylimidazole solution at a constant speed at room temperature to obtain a mixed solution, wherein the volume ratio of the cobalt nitrate hexahydrate solution and the 2-methylimidazole solution is 1: 1.

[0048] (4) The mixture was sealed with plastic wrap and stirred magnetically fo...

Embodiment 2

[0055] The difference between the cobalt selenide / nitrogen-doped carbon composite material provided in this embodiment and that of embodiment 1 is that:

[0056] In step (3), the volume ratio of cobalt nitrate hexahydrate solution and 2-methylimidazole solution is 1:0.8.

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Abstract

The invention provides a cobalt selenide / nitrogen-doped carbon composite material and a preparation method and application thereof, and relates to the technical field of nanometer materials. The preparation method of a cobalt selenide / nitrogen doped carbon composite material includes the following steps: S1, mixing a cobalt salt solution and an imidazole compound solution, stirring and reacting atroom temperature to obtain a two-dimensional leaf-shaped precursor. S2, adding a reducing agent into a solution containing a selenium source, and obtaining selenium nanoparticles at 90 to 100 DEG C.S3, mixing the precursor and the selenium nanoparticles to obtain a mixture, and calcining the mixture in a protective atmosphere to obtain a cobalt selenide / nitrogen doped carbon composite material.The composite has two-dimensional leaf-like nitrogen-doped carbon matrix, and ultrafine cobalt selenide nanoparticles embedded in the matrix, so that the composite has good conductivity, limited volume expansion stress, and exhibits excellent cycle stability and rate performance as the negative electrode material of sodium ion battery. The preparation process of the composite is simple and the cost is low, so the composite has the potential of large-scale application.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, and in particular to a cobalt selenide / nitrogen-doped carbon composite material and its preparation method and application. Background technique [0002] The non-renewability of traditional energy such as petroleum and coal and the shortcomings of environmental pollution during use have become increasingly prominent in energy development. Clean energy such as tidal energy and wind energy has gradually entered people's lives and has become the key to future world energy development. mainstream. However, most new energy sources are intermittent and cannot achieve continuous supply. In this era of energy interaction, energy storage has become an important link and restrictive factor in the development of new energy technologies. Lithium-ion batteries that are mature in the market cannot meet the energy storage needs of large-scale power grids due to the limitations of lithium mine reso...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCB82Y30/00H01M4/362H01M4/581H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 李晓丹姜春海张文堤
Owner XIAMEN UNIV OF TECH
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