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Oxygen electrode composite catalyst used for lithium-air batteries and preparation method of the oxygen electrode composite catalyst

A composite catalyst, lithium-air battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of increasing the electrochemical polarization of lithium-air batteries, failing to form a three-phase reaction interface, hindering oxygen diffusion, etc. Charge-discharge capacity and rate capability, the effect of promoting electrochemical reduction reaction and increasing specific surface area

Inactive Publication Date: 2013-10-02
SHANGHAI SINOPOLY JIAHUA BATTERY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sun Bin et al. (Nano Res, 5(7): 460-469, 2012) studied the catalyst performance of cobaltous oxide and mesoporous carbon composite catalyst (CoO / Mesoporous carbon), and obtained a good first discharge performance, and the The catalyst structure inhibits the attenuation effect of the lithium-air battery during cycling to a certain extent; Yang shao-Horn et al. (J.AM.Chem.Soc.133,19048-19051,2011) discussed various Catalytic properties of noble metals, and a preliminary exploration of the catalytic mechanism of catalysts in lithium-air batteries; 2 The catalytic performance of the composite catalyst with metal Pd, the catalyst effectively reduces the charging voltage of the lithium-air battery, and contributes to the stability of the organic electrolyte in the lithium-air battery; based on the research results of the above researchers, it is found that using the catalyst reported above and There is no very good improvement in the cycle performance of lithium-air batteries. The reason is that the electrolyte, catalyst and oxygen cannot form a good three-phase reaction interface in the cathode catalyst structure, which is not conducive to the diffusion and transfer of reaction products, resulting in the formation of reaction products. The deposition hinders the diffusion of oxygen in the catalyst, and at the same time, due to the poor conductivity of the reaction product, the electrochemical polarization of the lithium-air battery is increased, and the excessive charging voltage will decompose the organic electrolyte in the battery system and cause lithium air battery not working

Method used

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  • Oxygen electrode composite catalyst used for lithium-air batteries and preparation method of the oxygen electrode composite catalyst
  • Oxygen electrode composite catalyst used for lithium-air batteries and preparation method of the oxygen electrode composite catalyst
  • Oxygen electrode composite catalyst used for lithium-air batteries and preparation method of the oxygen electrode composite catalyst

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Embodiment 1

[0031] At room temperature, add 10ml of N'-dimethylformamide (DMF) solvent to a 20ml sealed bottle, add 0.5603g of manganese acetate tetrahydrate and 0.05325g of nickel acetate tetrahydrate with stirring, and when it is completely dissolved, continue to stir and slowly Slowly add 1.0g of high molecular polymer polyacrylonitrile (PAN), continue to stir and start to slowly heat to 50°C, stir for 8h at a constant temperature of 50°C to form a uniform electrostatic spinning solution with a certain viscosity; leave the static at room temperature Spin the solution for 4 hours until the bubbles in the solution disappear completely, electrospin the electrostatic spinning solution that has been left to remove the bubbles to prepare high molecular polymer nanofibers with a diameter of 600 nm; the above-mentioned high molecular polymer obtained by the electrostatic spinning technology After drying on the nanofiber at 80℃ for 12h in a vacuum environment to remove the residual solvent in the...

example 2

[0034] At room temperature, add 8ml of N'-dimethylformamide (DMF) solvent and 2ml of acetone to a 20ml sealed bottle in turn, add 0.6239g of manganese acetate tetrahydrate under stirring, and when it is completely dissolved, continue to stir and add gradually 0.9g high molecular polymer polyacrylonitrile (PAN) and 0.1g polyethylene oxide (PEO), continue to stir and start to slowly heat to 50°C, at a constant temperature of 50°C, stir for 8h to form a uniform electrostatic spinning with a certain viscosity Solution; The electrostatic spinning solution is allowed to stand at room temperature for 3 hours until the bubbles in the solution disappear completely, and the electrostatic spinning solution that has been statically de-bubbled is subjected to electrostatic spinning to prepare high molecular polymer nanofibers with a diameter of 300 nm; the above adopts electrostatic spinning The high molecular polymer nanofibers obtained by silk technology were dried at 80℃ for 12 hours in a...

example 3

[0037] At room temperature, add 8ml of N'-dimethylformamide (DMF) solvent and 2ml of absolute ethanol to a 20ml sealed bottle in turn, add 0.6227g of cobalt acetate tetrahydrate with stirring, and when it is completely dissolved, continue to stir and sequentially Slowly add 0.8g of high molecular polymer polyacrylonitrile (PAN) and 0.1g of polyvinylpyrrolidone (PVP), continue to stir and start to slowly heat to 50°C, stir for 8h at a constant temperature of 50°C to form a uniform viscosity Electrospinning solution; the electrospinning solution is allowed to stand at room temperature for 5 hours until the bubbles in the solution disappear completely, and the electrostatic spinning solution that has been left to remove the bubbles is subjected to electrospinning to prepare high molecular polymer nanofibers with a diameter of 500 nm; The high molecular polymer nanofibers obtained by electrospinning technology were dried for 12 hours in a vacuum environment at 80℃ to remove the resi...

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Abstract

The invention discloses an oxygen electrode composite catalyst used for lithium-air batteries and a preparation method of the oxygen electrode composite catalyst. The composite catalyst is in a structure of nano-fiber meshes on the whole. The composite catalyst comprises a porous carbon nanometer fiber main body skeleton, and metal particles and / or metal oxide particles, wherein the metal particles and / or the metal oxide particles are uniformly grew on the carbon nanometer fiber main body skeleton in convex and embedded manners. The preparation method comprises a step of dissolving a polymer and a metal salt into a solvent, stirring until the mixture is completely dissolved, and forming an electrostatic spinning solution having a certain viscosity; a step of subjecting the electrostatic spinning solution to electrostatic spinning to prepare nanoscale polymer fibers having a diameter range of 300-800 nm; and a step of subjecting the nanoscale polymer fibers to drying under vacuum to remove residual solvent, performing low-temperature preheating treatment and high-temperature carbonization treatment to prepare the nano-fiber composite catalyst. The composite catalyst provided by the invention improves rate capacity and cyclic performance of lithium-air batteries.

Description

Technical field [0001] The invention relates to the technical field of metal-air batteries, in particular to a method for preparing an oxygen electrode nanofiber composite catalyst for lithium-air batteries. Background technique [0002] The contradiction between the increasing energy demand and the shortage of fossil energy is one of the huge challenges facing human society. The constant search for new energy sources and the development of excellent energy storage technologies are the only way for human sustainable development. Since the commercialization of lithium-ion batteries in the 1990s, they have been widely used in many small mobile devices; however, the current specific energy density is low (~100Whkg -1 ), poor safety performance, high price and other issues restrict the application of lithium-ion batteries in new energy vehicles. The lithium-air battery has an ultra-high theoretical specific energy density of 11140Whkg -1 , Which can fundamentally meet the high specif...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCY02E60/50
Inventor 黄博文廖小珍马紫峰阳炳检
Owner SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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