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A ti3sic2-based porous core-shell material

A core-shell and shell-layer technology, applied to structural parts, electrical components, battery electrodes, etc., can solve problems such as poor cycle stability and low specific capacity

Active Publication Date: 2020-06-30
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many kinds of negative electrode materials used in lithium-ion batteries, such as carbon materials, alloy materials, titanium dioxide, etc., but the specific capacity of carbon materials and titanium dioxide is low, which is not suitable for modern electronic devices, alloy materials, such as silicon-based and tin-based, etc. Although the alloy material has a high specific capacity, it has the disadvantage of poor cycle stability during use.

Method used

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  • A ti3sic2-based porous core-shell material
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  • A ti3sic2-based porous core-shell material

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Experimental program
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preparation example Construction

[0036] The present invention provides the Ti described in the technical solution 3 SiC 2 The preparation method of base porous core-shell material comprises the steps:

[0037] (1) Put Ti 3 SiC 2 The powder is ground under anaerobic conditions, and a decomposition reaction occurs to obtain an abrasive including titanium carbide and silicon carbide;

[0038] (2) Screening the grinding material obtained in the step (1) for particle size to obtain a sintered material; the particle size of the sintered material is 100-800nm;

[0039] (3) Oxidize and sinter the sintered material obtained in the step (2) to obtain Ti 3 SiC 2 based porous core-shell material; the oxidation sintering temperature is 100-600°C, and the oxidation sintering time is 10-150min.

[0040] In the present invention, Ti 3 SiC 2 The powder is ground under anaerobic conditions, undergoes decomposition reaction, and obtains grinding materials including titanium carbide and silicon carbide. In the present inv...

Embodiment 1

[0070] Ti with a particle size of 0.01mm 3 SiC 2 The powder is put into a ball mill and ball milled under anaerobic conditions. The ball-to-material ratio is 10:1, the speed is 400rpm, and the time is 10h. The ball-milled powder is centrifuged at 500rpm for 1min and left for 3h. The solid material is dried, placed in a muffle furnace, heat treated at 100°C for 60 minutes, and taken out after cooling to obtain Ti 3 SiC 2 based porous core-shell structure materials.

[0071] Ti 3 SiC 2 The base porous core-shell material is mixed with acetylene black and polyvinylidene fluoride (PVDF) according to the ratio of 80:10:10, and NMP is added dropwise to prepare slurry, which is coated on copper foil as the negative electrode of lithium ion battery, and lithium sheet as the positive electrode, with LiPF 6 The solution is an electrolyte, which is assembled into a lithium-ion battery.

Embodiment 2

[0073] The particle size is 0.1mmTi 3 SiC 2 Put the powder into a ball mill and mill under anaerobic conditions. The ball-to-material ratio is 10:1, the speed is 600rpm, and the time is 15h. The ball-milled powder is centrifuged at 500rpm for 1min and left for 3h. The solid material is dried, placed in a muffle furnace, heat-treated at 300°C for 60 minutes, and taken out after cooling to obtain Ti 3 SiC 2 based porous core-shell structure materials.

[0074] Ti 3 SiC 2 The base porous core-shell material is mixed with acetylene black and polyvinylidene fluoride (PVDF) according to the ratio of 80:10:10, and NMP is added dropwise to prepare slurry, which is coated on copper foil as the negative electrode of lithium ion battery, and lithium sheet as the positive electrode, with LiPF 6 The solution is an electrolyte, which is assembled into a lithium-ion battery.

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Abstract

The invention belongs to the technical field of battery materials, and especially relates to a Ti3SiC2-based porous core-shell material. The Ti3SiC2-based porous core-shell material comprises a core and a shell layer, and the core comprises titanium carbide and silicon carbide; the shell layer comprises titanium dioxide and silicon dioxide; and the surface and the internal of the shell have pores.The Ti3SiC2-based porous core-shell material has a high specific capacity and a cycle stability.

Description

technical field [0001] The invention belongs to the technical field of battery materials, in particular to a Ti 3 SiC 2 based porous core-shell material. Background technique [0002] With the wide application of electronic devices, people's performance requirements for electronic devices are getting higher and higher. As one of the factors affecting the performance of electronic devices, battery materials have attracted widespread attention from the society. Modern electronic devices, such as mobile phones, computers, and digital cameras, mostly use lithium-ion batteries. This type of battery has the advantages of light weight, long life, high specific energy density, no pollution, and no memory effect. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, separators and electrolytes, and the performance of negative electrode materials determines battery performance. At present, there are many kinds of negative electrode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/58H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 张新宇李晨阳秦家千张世良马明臻刘日平
Owner YANSHAN UNIV