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Zinc-cobalt sulfide/carbon nano negative electrode material and preparation method thereof

A negative electrode material and sulfide technology, which is applied in the field of zinc-cobalt sulfide/carbon nano-negative electrode material and its preparation, can solve the problems that the rate performance needs to be improved, the preparation process is complicated and cumbersome, and the particle size and crystal form are not easy to control.

Active Publication Date: 2020-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In summary, the above preparation methods have the following disadvantages: the obtained product has more sulfides of other heterogeneous phases, which reduces the crystallinity, thereby reducing the cycle stability; the product is easy to agglomerate, and the rate performance needs to be improved; the preparation process is complicated and tedious, And the particle size and crystal form are not easy to control

Method used

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  • Zinc-cobalt sulfide/carbon nano negative electrode material and preparation method thereof
  • Zinc-cobalt sulfide/carbon nano negative electrode material and preparation method thereof
  • Zinc-cobalt sulfide/carbon nano negative electrode material and preparation method thereof

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Embodiment 1

[0072] The zinc-cobalt sulfide / carbon nano-anode material is that zinc-cobalt sulfide nanoparticles are distributed inside and on the surface of the carbon matrix as irregular polyhedrons with a particle size of 10-30 nm, and the formed particle size is 100-250 nm, and the shell thickness is 20 nm. ~30nm hollow irregular spherical shell structure; the mass ratio of the zinc-cobalt sulfide to carbon is 2.5:1; the chemical formula of the zinc-cobalt sulfide is Zn 0.76 co 0.24 S.

[0073] Such as figure 1 Shown, the characteristic peak shape and intensity of zinc cobalt sulfide / carbon nano negative electrode material of the present invention and Zn x co 1-x The S standard spectrum line is consistent, the peak shape is sharp, and the crystallinity is good, which is the pure phase of zinc-cobalt sulfide; there is a weak and gentle diffraction peak at about 20°, indicating that there is amorphous carbon in the material.

[0074] Such as figure 2 As shown, the zinc-cobalt sulfi...

Embodiment 2

[0088] The zinc-cobalt sulfide / carbon nano-anode material is that zinc-cobalt sulfide nanoparticles are distributed inside and on the surface of the carbon matrix as irregular polyhedrons with a particle size of 20-30 nm, and the formed particle size is 200-300 nm, and the shell thickness is 20 nm. ~40nm hollow irregular spherical shell structure; the mass ratio of the zinc-cobalt sulfide to carbon is 4:1; the chemical formula of the zinc-cobalt sulfide is Zn 0.5 co 0..5 S.

[0089] After testing, the characteristic peak shape and intensity of the zinc-cobalt sulfide / carbon nano negative electrode material of the present invention and Zn x co 1-x The S standard spectrum line is consistent, the peak shape is sharp, and the crystallinity is good, which is the pure phase of zinc-cobalt sulfide; there is a weak and gentle diffraction peak at about 20°, indicating that there is amorphous carbon in the material.

[0090] Such as Figure 8 As shown, the zinc-cobalt sulfide / carbon...

Embodiment 3

[0104] The zinc-cobalt sulfide / carbon nano-anode material is zinc-cobalt sulfide nanoparticles distributed inside and on the surface of the carbon matrix as irregular polyhedrons with a particle size of 10-30 nm, and the formed particle size is 100-300 nm, and the shell thickness is 20 nm. ~50nm hollow irregular spherical shell structure; the mass ratio of the zinc-cobalt sulfide to carbon is 1.5:1; the chemical formula of the zinc-cobalt sulfide is Zn 0.5 co 0.5 S.

[0105] After testing, the characteristic peak shape and intensity of the zinc-cobalt sulfide / carbon nano negative electrode material of the present invention and Zn x co 1-x The S standard spectrum line is consistent, the peak shape is sharp, and the crystallinity is good, which is the pure phase of zinc-cobalt sulfide; there is a weak and gentle diffraction peak at about 20°, indicating that there is amorphous carbon in the material.

[0106] After testing, the zinc-cobalt sulfide / carbon nanometer negative el...

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Abstract

The invention discloses a zinc-cobalt sulfide / carbon nano negative electrode material and a preparation method thereof. The negative electrode material is of a hollow irregular spherical shell structure formed by distributing zinc-cobalt sulfide nano particles in a carbon matrix and on the surface of the carbon matrix, wherein the mass ratio of the zinc-cobalt sulfide to the carbon is (0.5 to 4.0): 1. The method comprises the steps of (1) adding a surfactant and 2-methylimidazole into an alcoholic solution, stirring, adding a zinc source alcoholic solution, stirring, standing and centrifuging;(2) dissolving in an alcoholic solution, adding a surfactant and 2-methylimidazole, stirring, adding a cobalt source alcoholic solution, stirring, carrying out solvothermal reaction, cooling, centrifuging, washing and drying; (3) adding trihydroxymethyl aminomethane into an alcoholic solution, stirring, adding dopamine hydrochloride, stirring, carrying out suction filtration, washing and drying;and (4) pre-roasting, cooling, mixing with sulfur powder, roasting and cooling. The material provided by the invention is excellent in electrochemical performance. The method provided by the inventionis mild, low in cost, environmentally friendly and suitable for industrial production.

Description

technical field [0001] The invention relates to a negative electrode material and a preparation method thereof, in particular to a zinc cobalt sulfide / carbon nanometer negative electrode material and a preparation method thereof. Background technique [0002] With the rapid development of industrialization, the excessive consumption of traditional fossil energy has brought a series of environmental pollution problems, and cannot meet the growing energy demand. As a secondary energy storage device that can be charged and discharged multiple times, lithium-ion batteries have the advantages of easy miniaturization, low cost, and environmental friendliness. They also have promising application prospects in new energy vehicles with high energy and high power requirements. [0003] At present, lithium-ion batteries have been commercially used in various portable devices. The negative electrode graphite carbon material has good stability, but the theoretical specific capacity is lo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/583H01M4/625H01M4/5815H01M10/0525Y02E60/10
Inventor 童汇龚竹月余荣天黄英德喻万景丁治英李文章刘敏陈根
Owner CENT SOUTH UNIV
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