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A three-dimensional porous lithium metal composite anode material, preparation method and application thereof

A technology of three-dimensional porous and negative electrode materials, applied in electrode manufacturing, electrode rolling/calendering, battery electrodes, etc., can solve the difficulties of automation and large-scale industrialization, high manufacturing costs of three-dimensional porous current collector materials, and unsatisfactory Coulombic efficiency and other issues, to achieve the effect of increasing cycle stability and Coulombic efficiency, reducing current density, good electrical and thermal conductivity

Active Publication Date: 2019-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the three-dimensional porous current collector materials and manufacturing costs in these preparation methods are high, the process is complicated, it is difficult to realize automation and large-scale industrialization, and its Coulombic efficiency is still not ideal.

Method used

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  • A three-dimensional porous lithium metal composite anode material, preparation method and application thereof
  • A three-dimensional porous lithium metal composite anode material, preparation method and application thereof
  • A three-dimensional porous lithium metal composite anode material, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (1) The 1000-mesh 304 stainless steel mesh (wire diameter 0.04mm, thickness 0.14mm) was punched under the cutting machine to obtain a current collector disc with a diameter of 12mm. It is pretreated: first use dilute hydrochloric acid with a mass fraction of 5% to carry out pickling treatment at 25° C., and the pickling time is 10 minutes. Then use alcohol and ultrasonic vibration to clean 3 times, 15 minutes each time, to clean the oxides and oil stains on the surface, and finally dry the stainless steel mesh in a vacuum oven at 80°C for 5 hours with a vacuum degree of 1000Pa.

[0046] (2) Place the stainless steel mesh cleaned and dried in step (1) in a glow ion nitriding furnace for surface nitrogen doping treatment. The surface nitrogen doping treatment temperature is 500°C, the time is 1 hour, the gas source is ammonia gas, and the air pressure is 300Pa; the surface scanning electron microscope image of the obtained nitrogen-doped stainless steel mesh collector flu...

Embodiment 2

[0050] (1) The 1000-mesh 316 stainless steel mesh (wire diameter 0.05 mm, thickness 0.15 mm) was punched under a cutting machine to obtain a current collector disc with a diameter of 12 mm. It is pretreated: first use dilute hydrochloric acid with a mass fraction of 3% to carry out pickling treatment at 30° C., and the pickling time is 8 minutes. Then use alcohol supplemented with ultrasonic vibration to clean 3 times, each cleaning time is 10 minutes, and finally the stainless steel mesh is dried in a vacuum drying oven at 60°C for 8 hours, and the vacuum degree is 2000Pa.

[0051] (2) Place the stainless steel mesh cleaned and dried in step (1) in a glow ion nitriding furnace for surface nitrogen doping treatment. The treatment temperature is 300°C, the time is 0.1 hour, the gas source is ammonia gas, and the air pressure is 250Pa;

[0052] (3) Stack the nitrogen-doped stainless steel sheet and the lithium sheet obtained in step (2) into a tablet press, gradually increase t...

Embodiment 3

[0055] (1) The 500-mesh 304 stainless steel mesh (wire diameter 0.03 mm, thickness 0.05 mm) was punched under a cutting machine to obtain a current collector disc with a diameter of 12 mm. It is pretreated: first use dilute hydrochloric acid with a mass fraction of 2.5% to carry out pickling treatment at 45° C., and the pickling time is 20 minutes. Then use alcohol and ultrasonic vibration to clean 3 times, each time for 15 minutes, to clean the oxide and oil on the surface, and finally dry the stainless steel mesh in a vacuum drying oven at 60°C for 8 hours, with a vacuum degree of 3500Pa;

[0056] (2) Place the stainless steel mesh cleaned and dried in step (1) in a glow ion nitriding furnace for surface nitrogen doping treatment. Nitriding treatment temperature is 350 DEG C, time is 0.1 hour, and the gas source charged is ammonia gas, and the air pressure is 300Pa; The 500 mesh stainless steel mesh used in this embodiment is different from the 1000 mesh stainless steel mesh...

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Abstract

The invention discloses a three-dimensional porous lithium metal composite negative electrode material and a preparation method and application thereof. At first, that weave stainless steel mesh is pickled and dry to obtain clean and dry stainless steel mesh current collector; A low-temperature surface nitriding treatment is then carry out in a glow plasma nitriding furnace, wherein that treatmenttemperature is 300-500 DEG C and the treatment time is 0.1-5 hours; Finally, the nitrogen-doped stainless steel mesh and the lithium sheet are mechanically pressed by a tablet press to prepare a three-dimensional porous lithium metal composite anode material. As that preparation method has strong controllability, simple proces, low cost and easy industrialization, the preparation method can be used in the preparation industry of lithium metal battery electrode material, and the cycling stability of the electrode material is remarkably improved.

Description

technical field [0001] The invention relates to a lithium metal battery, in particular to a three-dimensional porous lithium metal composite negative electrode material and its preparation method and application, belonging to the field of porous metal materials and lithium metal batteries. Background technique [0002] Against the backdrop of increasingly urgent global energy and environmental issues, the acquisition and utilization of renewable energy, as well as the research and development of efficient and safe energy storage technologies have always been one of the hotspots of industry and science. As an energy storage device, lithium-ion secondary batteries have the advantages of high specific energy and long cycle life. In the past ten years, their research has made great progress, and they have been widely used in various portable electronic devices and electric vehicles. However, with the continuous emergence of various high-performance devices, especially the increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/04H01M4/66H01M10/052H01M10/058
CPCH01M4/0435H01M4/1395H01M4/661H01M4/667H01M10/052H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 袁斌梁杰铬胡仁宗杨黎春刘军朱敏
Owner SOUTH CHINA UNIV OF TECH
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