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Nanotube catalyst for air electrode of lithium-air battery in hierarchical porous structure

A lithium-air battery and air electrode technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of low performance of lithium-air battery air electrode catalysts and insufficient performance of lithium-air battery air electrodes , lithium-air battery charging polarization and other problems, to achieve the effect of increasing catalytic reaction active sites, improving charge and discharge efficiency, and reducing battery polarization

Inactive Publication Date: 2016-04-13
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of an air electrode catalyst for a lithium-air battery, aiming at solving the problem of poor performance of an air electrode catalyst of an existing lithium-air battery, insufficient performance of an air electrode of a lithium-air battery, and the charging polarization of the lithium-air battery Large, low charge and discharge efficiency, short cycle life, and poor rate performance

Method used

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preparation example Construction

[0020] The embodiment of the present invention provides a preparation method of an air electrode catalyst for a lithium-air battery, comprising the following steps:

[0021] S01. Provide metal nitrate M(NO 3 ) x and polyvinylpyrrolidone, the metal nitrate and the polyvinylpyrrolidone are dissolved in an organic solvent and mixed to obtain a precursor solution;

[0022] S02. The precursor solution is subjected to electrospinning treatment, and the obtained nanofibers are collected, wherein, the voltage of the electrospinning treatment is 10-30KV, and the collecting plate and the spinneret tip of the nanofibers are collected The distance is 10-30cm;

[0023] S03. The nanofibers are vacuum-dried and calcined in sequence to obtain a nanotube-shaped lithium-air battery air electrode catalyst with a multi-level pore structure.

[0024] Specifically, in the above step S01, the metal nitrate is the main raw material for electrospinning to prepare the air electrode catalyst for the ...

Embodiment 1

[0053] A kind of lithium-air battery, its preparation method comprises the following steps:

[0054] S11. 10~40wt% Co(NO 3 ) 2 and 5-20wt% pore-forming agent polyvinylpyrrolidone (PVP) are dissolved in N,N-dimethylformamide (DMF), and stirred at room temperature for 6-18 hours to obtain a transparent precursor solution.

[0055] S12. The precursor solution is loaded into the syringe connected to the stainless steel spinneret, the spinneret is connected to the metering pump, and electrospinning is performed, and the nanofibers ejected from the spinneret enter the collecting plate, wherein the voltage of the electrospinning The temperature is 10-30KV, the temperature is 20-50°C, the relative humidity is 30-70%, and the distance between the collecting plate and the spinneret tip is 10-30cm.

[0056] S13. Vacuum drying the obtained nanofibers at 50-80° C. for 6-12 hours, and then calcining in a muffle furnace at 600-800° C. for 2-4 hours, wherein the heating rate is 1-5° C. / min....

Embodiment 2

[0060] A lithium-air battery, with Mn(NO 3 ) 4 It is raw material, and its preparation method is identical with embodiment 1.

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Abstract

The invention is applicable to the technical field of development of materials for lithium-air battery electrodes, and provides a nanotube catalyst for an air electrode of a lithium-air battery in a hierarchical porous structure and a preparation method. The preparation method of the catalyst for the air electrode of the lithium-air battery comprises the steps as follows: metal nitrate M(NO<3>)<x> and polyvinylpyrrolidone are provided; the metal nitrate and the polyvinylpyrrolidone are dissolved into an organic solvent for mixing treatment to obtain a precursor solution; electrostatic spinning treatment is carried out on the precursor solution to collect obtained nanofiber, wherein the electrostatic spinning treatment pressure is 10KV to 30KV; the distance between a collecting plate of collecting the nanofiber and the point of a spinning nozzle is 10cm to 30cm; and vacuum drying treatment and calcining treatment are sequentially carried out on the nanofiber, so as to obtain the nanotube catalyst for the air electrode of the lithium-air battery in the hierarchical porous structure.

Description

technical field [0001] The invention belongs to the field of lithium-air battery electrode material development, and in particular relates to a nanotube-shaped lithium-air battery air electrode catalyst with a multi-level pore structure and a preparation method. Background technique [0002] Lithium-air batteries have high theoretical specific energy. When using organic electrolytes, their theoretical specific energy can reach 3622Wh / kg, which can reach dozens of times that of lithium-ion batteries widely used at present, almost equivalent to the level of fuel oil, and much higher than that of lithium-ion batteries. At the current level of 120Wh / kg for lithium iron phosphate lithium-ion batteries. In addition, lithium-air batteries use oxygen in the air as an active material, which reduces costs and is environmentally friendly, and has broad application potential in fields such as electric vehicles and energy storage. However, in practical applications, lithium-air batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/06H01M4/86H01M4/88H01M4/90B82Y30/00B82Y40/00
CPCH01M12/06B82Y30/00B82Y40/00H01M4/86H01M4/88H01M4/9008
Inventor 李娟吴正斌徐亚威
Owner SHENZHEN INST OF ADVANCED TECH
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