Copper magnetic current collector, preparation process thereof and magnetic lithium air battery containing the same

A preparation process and magnetic collection technology, applied in the field of lithium metal-air batteries, can solve problems such as poor cycle performance, large overpotential, and deviation of charge and discharge voltage from the theoretical equilibrium position

Active Publication Date: 2018-11-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the solid-liquid-gas three-phase reaction in the existing lithium-air battery, the discharge product is solid and non-conductive Li 2 o 2 , LiO 2 , so that the charge and discharge voltage deviates from the theoretical equilibrium position, resulting in a large overpotential; due to the discharge product Li 2 o 2 The continuous accumulation on the porous positive electrode blocks the pores and active sites, resulting in early termination of the discharge process and

Method used

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  • Copper magnetic current collector, preparation process thereof and magnetic lithium air battery containing the same
  • Copper magnetic current collector, preparation process thereof and magnetic lithium air battery containing the same
  • Copper magnetic current collector, preparation process thereof and magnetic lithium air battery containing the same

Examples

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Embodiment 2

[0074]Using the NdFeB material containing platinum and nickel as the substrate, the oxide on the surface of the substrate is removed first, then cleaned and dried. Mix the mixed microspheres of chitosan microspheres and albumin microspheres with water at a mass ratio of 100:250, stir to form an emulsion for use; mix the prepared emulsion, water and polyethylene glycol with a volume ratio of 10 :300:1 ratio mixing, ultrasonic dispersion or stirring to obtain electrodeposition solution. The above-mentioned magnetic material containing platinum and nickel is used as a working electrode, graphite is used as a counter electrode, and the prepared electrodeposition solution is used as a solution system for electrodeposition. The electrodeposition voltage is controlled to be 1V, the current is 0.001A, and the deposition time is 90s. The surface is covered with a magnetic material substrate with a template of polymer microspheres. Mix water and potassium hydrogen phthalate in a mass r...

Embodiment 3

[0076] The magnetic material containing platinum and nickel is used as the substrate, the oxide on the surface of the substrate is removed first, and then cleaned and dried. Mix polyacrylic acid microspheres and water at a mass ratio of 50:250, stir to form an emulsion for use; mix the prepared emulsion, water and polyethylene glycol at a volume ratio of 30:700:3, and ultrasonically disperse Or the electrodeposition solution is obtained after stirring. The above-mentioned magnetic material containing platinum and nickel is used as a working electrode, graphite is used as a counter electrode, and the prepared electrodeposition solution is used as a solution system for electrodeposition. The electrodeposition voltage is controlled to be 7V, the current is 0.02A, and the deposition time is 10s. The surface is covered with a magnetic material substrate with a template of polymer microspheres. Mix water and potassium hydrogen phthalate at a mass ratio of 100:5, stir to form a unif...

Embodiment 4

[0078] The magnetic material containing platinum and nickel is used as the substrate, the oxide on the surface of the substrate is removed first, and then cleaned and dried. Mix polylactic acid microspheres and water at a mass ratio of 50:350, and stir to form an emulsion for later use; mix the prepared emulsion, water, and polyethylene glycol at a volume ratio of 20:400:1, and ultrasonically disperse Or the electrodeposition solution is obtained after stirring. The above-mentioned magnetic material containing platinum and nickel is used as a working electrode, graphite is used as a counter electrode, and the prepared electrodeposition solution is used as a solution system for electrodeposition. The electrodeposition voltage is controlled to be 2.5V, the current is 0.005A, and the deposition time is 30s. A magnetic material matrix whose surface is covered with a polymer microsphere template is obtained. Mix water and diammonium hydrogen citrate at a mass ratio of 100:2, stir ...

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Abstract

The invention relates to the field of lithium metal air batteries, in particular to a copper magnetic current collector, a preparation process thereof and a magnetic lithium air battery containing thesame. Surface modification is performed on a material with the permanent magnetic property to obtain a negative electrode material of a lithium air battery with large specific surface and high catalytic activity. According to the invention, the mass transfer process of oxygen is enhanced through the micro magnetic field, the concentration of active oxygen on the positive electrode surface is improved by the paramagnetic property of oxygen, the magnetohydrodynamics effect, the magnetization force effect and the like produce disturbance on the electrolyte, so that the reaction activity of the gas-liquid-solid three-phase interface is increased, the polarization is reduced, non-uniform deposition of the negative electrode metal lithium is improved, and the lithium dendrites are inhibited; the catalytic activity of the bifunctional catalyst is increased and the over-potential is reduced by the electric field generated by the copper layer structure; by the structure field energy, the volume change stress is released, the expansion space is provided, a uniform reaction active site and the like are provided, and the overall electrochemical performance is fully improved.

Description

technical field [0001] The invention relates to the field of lithium metal-air batteries, in particular to a copper magnetic current collector, a preparation process thereof, and a magnetic lithium-air battery containing the same. Background technique [0002] In recent years, metal-air batteries have become a research hotspot due to their light weight, non-toxicity, high efficiency, and low cost. This type of battery uses metal (zinc, lithium, aluminum, etc.) and oxygen as fuel to convert chemical energy into electrical energy. It is not only rich in cheap resources, but also renewable, and its structure is simpler than hydrogen fuel cells. Among them, lithium-air batteries have attracted much attention. It has the largest theoretical specific energy density, reaching 11430Wh / kg, which is equivalent to fossil fuels and 5 to 10 times that of traditional lithium-ion batteries. The negative electrode of the lithium-air battery uses lithium metal, and the active material of th...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/08
CPCH01M4/9016H01M12/08Y02E60/10
Inventor 唐谊平沈康王曾张铎
Owner ZHEJIANG UNIV OF TECH
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