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A kind of negative electrode material of lithium ion battery and preparation method and application thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of volume change destroying its own structure, active material shedding, low conductivity, etc., and achieve a simple and highly reversible preparation method. The effect of improving the high coulombic efficiency

Active Publication Date: 2021-12-17
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar to alloyed anode materials, the huge volume change during charge and discharge destroys its own structure, causing active materials to fall off from the current collector.
And its own low conductivity and serious agglomeration make it still a huge challenge in practical application

Method used

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  • A kind of negative electrode material of lithium ion battery and preparation method and application thereof
  • A kind of negative electrode material of lithium ion battery and preparation method and application thereof
  • A kind of negative electrode material of lithium ion battery and preparation method and application thereof

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preparation example Construction

[0037] The present invention also provides a preparation method of the lithium ion battery negative electrode material described in the above technical solution, comprising the following steps:

[0038] Mix titanium powder, niobium powder, aluminum powder and carbon powder, pre-press and discharge plasma sintering in sequence to obtain niobium-doped Ti 3 AlC 2 ; The molar ratio of the titanium powder, aluminum powder and carbon powder is 3:1:2;

[0039] Doping the niobium with Ti 3 AlC 2 After pulverization, etching is carried out to obtain niobium-doped two-dimensional layered Ti 3 C 2 ;

[0040] The niobium doped two-dimensional layered Ti 3 C 2 calcining to obtain the lithium ion battery negative electrode material.

[0041] In the present invention, titanium powder, niobium powder, aluminum powder and carbon powder are mixed, followed by prepress molding and discharge plasma sintering to obtain niobium-doped Ti 3 AlC 2 ; The molar ratio of the titanium powder, al...

Embodiment 1

[0055] Weigh titanium powder, niobium powder, aluminum powder and carbon powder according to the molar ratio of 2:1:1.4:1.8; the particle diameters of the four kinds of powders are 300 mesh, wet mix the four kinds of powders with alcohol for 30min, and then Vacuum drying at ℃ for 12 hours; pre-press the mixed powder at 2kN for 2 minutes; then adjust the vacuum degree of the atmosphere to 10Pa, the sintering pressure to 50MPa, and raise the temperature to 1450℃ at a heating rate of 50℃ / min and keep it for 60min. Spark plasma sintering to obtain niobium-doped Ti 3 AlC 2 .

[0056] Niobium doped Ti 3 AlC 2 Pulverize, select powder between 300 mesh and 2000 mesh, use HF with a mass fraction of 50% to etch for 24 hours, and heat in a water bath at a temperature of 50°C to obtain niobium-doped two-dimensional layered titanium carbide, denoted as Ti 2 NbC 2 ;

[0057] 0.5g Ti 2 NbC 2 Put it into a porcelain boat, put it into a tube furnace, and seal the tube furnace; in an ai...

Embodiment 2

[0064] Weigh titanium powder, niobium powder, aluminum powder and carbon powder according to the molar ratio of 2:1:1.4:1.8; the particle diameters of the four kinds of powders are 300 mesh, wet mix the four kinds of powders with alcohol for 30min, and then Vacuum drying at ℃ for 12 hours; pre-press the mixed powder at 2kN for 2 minutes; then adjust the vacuum degree of the atmosphere to 10Pa, the sintering pressure to 50MPa, and raise the temperature to 1450℃ at a heating rate of 50℃ / min and keep it for 60min. Spark plasma sintering to obtain niobium-doped Ti 3 AlC 2 .

[0065] Niobium doped Ti 3 AlC 2 Pulverize, select powder between 300 mesh and 2000 mesh, use HF with a mass fraction of 50% to etch for 24 hours, and heat in a water bath at a temperature of 50°C to obtain niobium-doped two-dimensional layered titanium carbide, denoted as Ti 2 NbC 2 ;

[0066] 0.5g Ti 2 NbC 2 Put it into a porcelain boat, put it into the tube furnace and seal the tube furnace well. I...

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Abstract

The invention provides a lithium-ion battery negative electrode material, a preparation method and application thereof, and belongs to the technical field of lithium-ion battery materials. The microscopic morphology of the lithium ion battery negative electrode material provided by the present invention is an accordion-shaped multi-sheet body, and there are regularly distributed cubic crystal Ti-Nb-O on the surface of the sheets. The present invention introduces niobium element into the titanium carbide and oxygen element into the niobium-doped titanium carbide, which can obviously improve the specific capacity of the lithium ion negative electrode material. The present invention also provides a preparation method of the lithium ion battery negative electrode material described in the above technical solution. The preparation method of the present invention can successfully prepare a lithium ion battery negative electrode material with an accordion-shaped multi-layer body, and the preparation method Simple.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a lithium ion battery negative electrode material and a preparation method and application thereof. Background technique [0002] Energy and environmental crises have prompted people to accelerate the development of green energy represented by solar energy, wind energy, and tidal energy. However, they are all intermittent energy sources that need to be used in conjunction with energy storage devices. Lithium-ion batteries are widely used in consumer electronics, power storage and large-scale power grids due to their high energy density, high power density, high output voltage, and no memory effect. Among them, the requirements for energy density in the field of power storage are particularly prominent . The lithium storage mechanism of existing lithium-ion batteries can be roughly divided into three categories. [0003] Intercalated Lithium Storage Mechani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M10/0525C01B32/90
CPCH01M4/587H01M10/0525C01B32/90H01M2004/021H01M2004/027Y02E60/10
Inventor 张新宇宋丰秦家千刘日平
Owner YANSHAN UNIV
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