Quinary high-entropy alloy oxide negative electrode material and preparation method and application thereof

A technology of high-entropy alloys and negative electrode materials, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., to achieve the effects of good cycle specific capacity, good conductivity, and high specific surface area

Pending Publication Date: 2021-08-13
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific capacity, fast charge and discharge performance, and cycle life of lithium-ion batteries need to be further optimized. At present, the commercial negative electrode material is still carbon material, and the theoretical specific capacity of carbon material is only 372mAh / g, which can no longer meet people's increasing requirements.

Method used

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  • Quinary high-entropy alloy oxide negative electrode material and preparation method and application thereof
  • Quinary high-entropy alloy oxide negative electrode material and preparation method and application thereof
  • Quinary high-entropy alloy oxide negative electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A five-element high-entropy alloy oxide negative electrode material and a preparation method thereof, comprising the steps of:

[0040] (1) Preparation of multi-element alloy strips: Analytical pure Ni, Cu, Fe, Co, Mn metal particles are selected as particles with a diameter of 1-5mm, and are smelted according to the atomic ratio of 8:8:8:8:68 - The spinning belt is prepared into a 30 μm thick alloy strip, and the spinning frequency of the stripping machine is 45 Hz, and the rotating speed is 15 m / s;

[0041] (2) Dealloying treatment: place the alloy strip prepared in step (1) in a 1mol / L ammonium sulfate solution for dealloying treatment at a temperature of 50°C and a corrosion time of 8 hours to form a homogeneous, nano Porous Multicomponent Alloys. According to EDX energy spectrum analysis, the atomic ratio of Mn after dealloying is about 15At%.

[0042] (3) Oxidation treatment: the metal after dealloying in step (2) is placed in the air atmosphere, the specific su...

Embodiment 2

[0055] A five-element high-entropy alloy oxide negative electrode material and a preparation method thereof, comprising the steps of:

[0056] (1) Preparation of multi-element alloy strips: Analytical pure Ni, Cu, Fe, Co, Mn metal particles are selected as particles with a diameter of 1-5mm, and are smelted according to the atomic ratio of 10:8:6:8:68 - The spinning strip is prepared into a 40 μm thick alloy strip, and the spinning frequency of the spinning machine is 50 Hz, and the rotating speed is 18 m / s;

[0057] (2) Dealloying treatment: place the alloy strip prepared in step (1) in a 1.5mol / L ammonium sulfate solution for dealloying treatment at a temperature of 60°C and a corrosion time of 6 hours to form a homogeneous, Nanoporous Multicomponent Alloys. According to EDX energy spectrum analysis, the atomic ratio of Mn after dealloying is about 10At%.

[0058] (3) Oxidation treatment: the metal after dealloying in step (2) is placed in the air atmosphere, the specific ...

Embodiment 3

[0065] A five-element high-entropy alloy oxide negative electrode material and a preparation method thereof, comprising the steps of:

[0066] (1) Preparation of multi-element alloy strips: Analytical pure Ni, Cu, Fe, Co, Mn metal particles are selected as particles with a diameter of 1-5mm, and are smelted according to the atomic ratio of 10:10:6:6:68 - The strip is prepared into a 50 μm thick alloy strip, and the speed frequency of the strip machine is 47 Hz, and the speed is 17 m / s;

[0067] (2) Dealloying treatment: place the alloy strip prepared in step (1) in a 2mol / L ammonium sulfate solution for dealloying treatment at a temperature of 70°C and a corrosion time of 5 hours to form a homogeneous, nano Porous Multicomponent Alloys. According to EDX energy spectrum analysis, the atomic ratio of Mn after dealloying is about 10At%.

[0068] (3) Oxidation treatment: the metal after dealloying in step (2) is placed in the air atmosphere, the specific surface area is signific...

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Abstract

The invention discloses a quinary high-entropy alloy oxide negative electrode material and a preparation method and application thereof, which belong to the technical field of lithium ion battery negative electrode materials. The negative electrode material comprises Ni, Cu, Fe, Co and Mn. The preparation process comprises the following steps of preparing a transition metal high-entropy alloy strip according to a specific atomic ratio through a smelting-melt-spinning process, enabling the quinary alloy strip to be subjected to dealloying treatment to form the multi-component homogeneous phase nano porous alloy, preparing the nano-porous metal into alloy powder with the uniform particle size through a grinding method, and carrying out oxidation treatment on the alloy powder in an air atmosphere, and carrying out reduction treatment in hydrogen/argon mixed gas to obtain the nano-porous multi-component metal oxide negative electrode material. The preparation method has the advantages that the preparation method is simple, the adopted transition metal is low in price, and large-scale production can be achieved; compared with commercial graphite, the multi-component high-entropy alloy oxide prepared from the multi-component high-entropy alloy through the method has higher specific capacity and excellent rate capability.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a nanoporous NiCuFeCoMn five-element high-entropy alloy oxide negative electrode material for lithium ion batteries and a preparation method and application thereof. Background technique [0002] With the rapid development of science and technology, people's demand for energy is also increasing. At present, the energy we rely on is mainly fossil fuels, but fossil fuels are non-renewable energy sources. With the gradual increase of consumption, the world's reserves are becoming less and less, so the development of clean energy is one of the important topics of current research. [0003] Society's technical requirements for power supplies are also getting higher and higher. Lithium-ion batteries are widely used in daily life as an efficient rechargeable energy storage device. The nickel-cadmium batteries that we used bef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/505H01M4/525H01M4/48H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 于镇洋李皓闫琳宗皊硕康建立张志佳孙仕昊姚福林何威
Owner TIANJIN POLYTECHNIC UNIV
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