ZnS-SnS@3DC composite material and preparation method and application thereof

A composite material, zns-sns technology, applied in nanotechnology for materials and surface science, chemical instruments and methods, tin compounds, etc., can solve problems such as volume expansion, active material shedding, and battery cycle stability deterioration , to achieve long cycle life, high specific capacity, and improve cycle stability.

Active Publication Date: 2021-07-09
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although they have a high theoretical capacity, there is a problem of volume expansion during the process of intercalating lithium or sodium ions, which leads to the shedding of the active material from the collector and the poor cycle stability of the battery.

Method used

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  • ZnS-SnS@3DC composite material and preparation method and application thereof
  • ZnS-SnS@3DC composite material and preparation method and application thereof
  • ZnS-SnS@3DC composite material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0037] (1)N 2 Under the atmosphere, the metal-organic framework ZIF-8 was carbonized at 900°C for 5 hours to obtain a nitrogen-doped three-dimensional porous carbon framework;

[0038] (2) Mix Sn powder, S powder and nitrogen-doped three-dimensional porous carbon framework to obtain a mixture, wherein the mass ratio of Sn powder and S powder is 3.6:1, and the mass of Sn powder and S powder accounts for 43% of the total mass of the mixture ; Then the mixture was sealed in a quartz tube with a vacuum degree of 0.1Pa, and calcined at 700° C. for 2 hours to obtain a ZnS-SnS@3DC composite material.

[0039] Such as figure 1As shown, in the vicinity of 28, 47, and 56 degrees on the abscissa 2θ, there are three diffraction peaks of ZnS, corresponding to (111) (220) (311) crystal planes; , 29, 30, 39, and 45 degrees are the diffraction peaks of SnS, corresponding to the (101)(201)(210)(011)(400)(311)(020) crystal plane.

[0040] Such as figure 2 As shown in Figure (c) (d), it can...

Embodiment 2

[0048] (1)N 2 Under the atmosphere, the metal-organic framework ZIF-8 was carbonized at 800°C for 3 hours to obtain a nitrogen-doped three-dimensional porous carbon framework;

[0049] (2) Mix Sn powder, S powder and nitrogen-doped three-dimensional porous carbon framework to obtain a mixture, wherein the mass ratio of Sn powder and S powder is 3.6:1, and the mass of Sn powder and S powder accounts for 25% of the total mass of the mixture ; Then the mixture was sealed in a quartz tube with a vacuum degree of 1 Pa, and calcined at 900° C. for 3 h to obtain a ZnS-SnS@3DC composite material. battery at 100mA g -1 After running 100 cycles under the current density, the specific capacity is 732mA h g -1 ; The Coulombic efficiency is stable at about 99.0%; it is used as the negative electrode material of the sodium ion battery, and the battery is stable at 100mA g -1 After 50 laps at current density, it is 198mA h g -1 , the Coulombic efficiency is stable at around 97%.

Embodiment 3

[0051] (1)N 2 Under the atmosphere, the metal-organic framework ZIF-8 was carbonized at 850°C for 5 hours to obtain a nitrogen-doped three-dimensional porous carbon framework;

[0052] (2) Mix Sn powder, S powder and nitrogen-doped three-dimensional porous carbon framework to obtain a mixture, wherein the mass ratio of Sn powder and S powder is 3.6:1, and the mass of Sn powder and S powder accounts for 65% of the total mass of the mixture ; Then the mixture was sealed in a quartz tube with a vacuum degree of 0.5 Pa, and calcined at 800° C. for 1 h to obtain a ZnS-SnS@3DC composite material. battery at 100mA g -1 After running 250 cycles under the current density, the specific capacity is 710mA h g -1 ; The Coulombic efficiency is stable at about 99.1%; it is used as the negative electrode material of the sodium ion battery, and the battery is stable at 100mA g -1 After running 40 laps under the current density, the specific capacity is 203mA h g -1 , the Coulombic efficien...

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Abstract

The invention discloses a ZnS-SnS@3DC composite material and a preparation method and application thereof. The ZnS-SnS@3DC composite material is formed by embedding ZnS-SnS nanocrystals with a heterostructure into a nitrogen-doped three-dimensional porous carbon framework obtained by carbonizing a metal organic framework ZIF-8 in a composite mode; and the ZnS-SnS@3DC composite material serves as a negative electrode material of a lithium ion battery or a sodium ion battery. The ZnS-SnS heterostructure nanocrystal is embedded into the nitrogen-doped three-dimensional porous carbon, so that the volume expansion of ZnS-SnS can be better limited, the structural stability of an active substance in a lithium or sodium de-intercalation process is ensured, and the electrochemical performance is further improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a ZnS-SnS@3DC composite material and its preparation method and application, in particular to a ZnS-SnS- SnS@3DC composite materials, preparation methods and their applications as anode materials for lithium-ion batteries and sodium-ion batteries. Background technique [0002] In contemporary society, environmental problems are increasing day by day, and recyclable energy storage devices are paid more attention. Among many energy storage devices, lithium-ion batteries (LIBs) have attracted attention due to their high energy density and long cycle life, and have been applied to all aspects of life with the continuous efforts of researchers, such as electric vehicles, portable Mobile devices, even large energy storage systems, etc. With the development of science and technology and the improvement of people's living standards, the demand for batteries with high energy den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525H01M10/054C01G19/00C01G9/08C01B32/00B82Y40/00B82Y30/00
CPCH01M4/362H01M4/5815H01M4/625H01M4/628H01M10/0525H01M10/054C01G9/08C01G19/00C01B32/00B82Y40/00B82Y30/00C01P2004/80C01P2006/40Y02E60/10
Inventor 杨林钰温曦李海兵赵风军张敏杨行王淑英
Owner XINJIANG UNIVERSITY
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