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Lithium-oxygen secondary battery cathode and preparation method thereof, lithium-oxygen secondary battery

A secondary battery, battery cathode technology, applied in fuel cell type half cells and secondary battery type half cells, battery electrodes, circuits, etc. The problem of poor mass transfer ability, etc., can achieve the effect of reducing the performance degradation and short circuit phenomenon of air batteries, broad application prospects, and strong hydrophobic performance.

Active Publication Date: 2017-07-14
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in order to realize the wide application of lithium-oxygen secondary batteries, a series of problems need to be solved, such as high overpotential, low discharge capacity, and short cycle life.
At present, the commercially used porous carbon air cathodes are all obtained by stacking carbon materials to create pores. The utilization rate of the pores is low, the connectivity is poor, and the mass transfer capacity is poor, which affects the discharge product Li. 2 o 2 deposition, leading to an increase in the overpotential of the lithium-oxygen secondary battery, and a small number of charge and discharge cycles
On the other hand, the loading of oxygen reduction / oxygen evolution catalysts in the existing porous carbon air cathode is mainly by mechanical mixing, which cannot effectively exert the synergistic effect between the carrier and the catalyst, and further deteriorates the energy conversion efficiency of lithium-air batteries. and rate performance
[0005] Moreover, in recent years, the development of flexible energy devices such as lithium-ion batteries, supercapacitors and piezoelectric devices has laid the foundation for the field of wearable electronics, but their low energy density is difficult to meet the needs of wearable devices for long battery life.
Lithium-oxygen secondary batteries have attracted extensive attention in the field of flexible energy devices due to their high theoretical energy density, but most of the positive electrodes of lithium-oxygen secondary batteries are rigid and inflexible, and the assembled lithium-oxygen It is difficult for secondary battery devices to achieve complex twist deformation changes, which cannot meet the needs of wearable devices

Method used

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  • Lithium-oxygen secondary battery cathode and preparation method thereof, lithium-oxygen secondary battery

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preparation example Construction

[0063] The invention provides a method for preparing a positive electrode of a lithium-oxygen secondary battery, comprising the following steps:

[0064] A) Under a protective atmosphere, place the mesh metal material on top of the melamine, and after roasting, obtain the positive electrode of the lithium-oxygen secondary battery.

[0065] In order to improve the performance of the manufactured product and the integrity of the overall process route, and reduce the influence of impurities and oil stains on the raw materials, the reticular metal material is preferably a pre-treated reticular metal material. The present invention has no particular limitation on the specific steps of the pretreatment, the pretreatment steps of metal materials well known to those skilled in the art can be used, and those skilled in the art can select and adjust according to actual production conditions, raw material conditions and product requirements, The pretreatment step in the present invention...

Embodiment 1

[0093] Step 1: Take a piece of stainless steel mesh, and use dilute hydrochloric acid and absolute ethanol to clean the stainless steel mesh several times;

[0094] Step 2: Weigh 2 grams of melamine solid powder and put it into a ceramic ark. Cover the ceramic ark with a piece of carbon paper, place the cleaned stainless steel mesh on the carbon paper, and put the whole into a high-temperature tube furnace;

[0095] The third step: using argon as the protective gas, start the tube furnace to heat up to 750 degrees Celsius at a rate of 5 degrees Celsius / minute, and keep at this temperature for 2 hours;

[0096] Step 4: After heating, wait for the reactant to cool down to room temperature, take out the stainless steel mesh, wash it several times with distilled water and absolute ethanol respectively, and after drying in the air, the surface of the stainless steel mesh is covered with a layer of black matter, which is the nitrogen-doped Carbon nanotubes@stainless steel mesh integ...

Embodiment 2

[0102] Step 1: Take a piece of stainless steel mesh, and use dilute hydrochloric acid and absolute ethanol to clean the stainless steel mesh several times;

[0103] Step 2: Weigh 2 grams of melamine solid powder and put it into a ceramic ark. Cover the ceramic ark with a piece of carbon paper, place the cleaned stainless steel mesh on the carbon paper, and put the whole into a high-temperature tube furnace;

[0104] The third step: using argon as the protective gas, start the tube furnace to heat up to 800 degrees Celsius at a rate of 5 degrees Celsius / minute, and keep at this temperature for 2 hours;

[0105] Step 4: After heating, wait for the reactant to cool down to room temperature, take out the stainless steel mesh, wash it several times with distilled water and absolute ethanol respectively, and after drying in the air, the surface of the stainless steel mesh is covered with a layer of black matter, which is the nitrogen-doped Carbon nanotubes@stainless steel mesh integ...

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Abstract

The invention provides a lithium-oxygen secondary battery cathode. The lithium-oxygen secondary battery cathode comprises a netty metal material and a nitrogen-doped carbon nano tube compounded on the surface of the metal material; the metal material comprises one or more of iron, nickel and iron-nickel alloy. A catalyst with a multi-duct structure is grown on the surface of the metal material mesh through a one-step method so as to obtain a bendable and super-hydrophobic integrated cathode material for the lithium-oxygen secondary battery; the cathode material has high duct use efficiency and connectivity, strong mass transfer capacity, improves the charging / discharging use efficiency and the cycle times. The preparation method is simple in process, convenient for operation, easy to realize scale production, and free from adding a collector and adhesive; the complicated powder electrode preparation process is saved, the specific energy of the lithium-air battery, the energy use efficiency and the stability of the air cathode are greatly improved. And meanwhile, the cathode material is provided with high mechanical strength and high hydrophobic property, and has extensive application prospect in the wearable electronic field.

Description

technical field [0001] The present invention relates to the technical field of lithium-oxygen secondary batteries, to a lithium-oxygen secondary battery positive electrode and a preparation method thereof, to a lithium-oxygen secondary battery, and in particular to a flexible, superhydrophobic lithium-oxygen secondary battery positive electrode Its preparation method, lithium-oxygen secondary battery. Background technique [0002] Air battery is a kind of chemical battery. Its construction principle is similar to that of dry battery. The difference is that its oxidant is taken from the oxygen in the air. It is also called oxygen battery. It is usually divided into lithium-air battery and zinc-air battery according to the positive electrode material. And aluminum-air batteries, etc., that is, metal-oxygen batteries. For example, zinc-air batteries use zinc as the cathode, sodium hydroxide as the electrolyte, and the anode is porous activated carbon, so it can absorb oxygen i...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/96H01M4/88H01M12/08
CPCH01M4/8647H01M4/88H01M4/96H01M12/08Y02E60/10
Inventor 张新波杨晓阳鲍迪徐吉静
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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