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Nano lithium manganite loaded carbon material cathode catalyst used for oxygen reduction of air electrode as well as preparation method and application of nano lithium manganite loaded carbon material cathode catalyst

A nano-lithium manganate, cathode catalyst technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology and other directions, can solve the problem of reducing the cycle stability of lithium-air batteries, reducing battery charge and discharge overpotential, expensive Price cost and other issues, to achieve the effect of improving charge and discharge efficiency, conducive to uniform dispersion and distribution, and easy operation

Inactive Publication Date: 2016-05-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, noble metal catalysts (such as: Yi-ChunLu, ZhichuanXu, HubertA. Gasteiger, et al. Journal of American Chemical Society 2010 (132), 12170-12171) can significantly reduce the battery charge and discharge overpotential, but due to its high price and cost, it is limited in the future. Use in mass production applications
At the same time, recent studies have shown (YoSubJeong, Jin-BumPark, Hun-GiJung, etal. NanoLetter, 2015, 15(7), 4261-4268), noble metal Pt, Pd loaded carbon materials can accelerate the corrosion of carbon materials and electrolytes The catalytic decomposition of the lithium-air battery significantly reduces the cycle stability of the lithium-air battery.

Method used

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  • Nano lithium manganite loaded carbon material cathode catalyst used for oxygen reduction of air electrode as well as preparation method and application of nano lithium manganite loaded carbon material cathode catalyst
  • Nano lithium manganite loaded carbon material cathode catalyst used for oxygen reduction of air electrode as well as preparation method and application of nano lithium manganite loaded carbon material cathode catalyst
  • Nano lithium manganite loaded carbon material cathode catalyst used for oxygen reduction of air electrode as well as preparation method and application of nano lithium manganite loaded carbon material cathode catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of nitrogen-doped reduced graphene:

[0032] (1) Preparation of reduced graphene catalyst

[0033] Add 1.0g of natural flake graphite powder and 0.5g of sodium nitrate to 70mL of concentrated sulfuric acid, stir magnetically for 3 hours, place it in an ice-water bath, add 1.0g of potassium permanganate and stir for 2 hours, then add 100mL of distilled water at 98°C for dilution , then add 7mL of 30% hydrogen peroxide until the color of the solution turns bright yellow, filter while hot, and wash the filter cake with 5% HCl solution until it is washed with BaCl 2 Detection of SO in the filtrate 4 2- Existence, graphene oxide was obtained after freeze-drying.

[0034] Put 100mg of graphene oxide in a horizontal electric tube furnace, under the protection of argon, at 10°C min -1 The heating rate is raised to 900°C, and the flow rate of the inert gas is controlled to 50mLmin -1; When the temperature reaches 900°C, close the argon gas valve, pass in ammonia...

Embodiment 2

[0040] Preparation of lithium manganate-supported nitrogen-doped reduced graphene:

[0041] (1) Preparation of lithium manganate-supported nitrogen-doped reduced graphene catalyst

[0042] Ultrasonic disperse 60 mg of the nitrogen-doped reduced graphene prepared in Example 1 in 60 mL of ethanol and deionized water with a volume ratio of 1:1, and then add 0.168 g of LiOH and 0.316 g of KMnO 4 After stirring at room temperature for 2 hours, the above solution was poured into an 80mL polytetrafluoroethylene reactor, and reacted at a constant temperature of 180°C for 5 hours. After the reaction was completed, it was naturally cooled to room temperature, and the reaction solution was subjected to suction filtration, washing, and freeze-drying for 12 hours to obtain the Nano-lithium manganese oxide supports nitrogen-doped reduced graphene cathode catalyst, and the loading capacity of lithium manganate prepared by the method is 75wt%. At the same time, the same experimental procedur...

Embodiment 3

[0052] Example 3 Preparation of lithium manganate-supported nitrogen-doped carbon nanotubes:

[0053] The preparation steps of the lithium manganate-supported nitrogen-doped carbon nanotube catalyst in this example are basically the same as in Example 1, the difference is that the carbon material used in this example is a commercial nanotube, and the manufacturer is Shenzhen Nanoport Carbon Material Co., Ltd. .

[0054] The air electrode preparation and lithium-air battery assembly steps in this example are basically the same as those in Example 1, except that the cathode catalyst used in this example is lithium manganate-supported nitrogen-doped carbon nanotubes.

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Abstract

The invention discloses a nano lithium manganite loaded carbon material cathode catalyst used for oxygen reduction of an air electrode as well as a preparation method of the nano lithium manganite loaded carbon material cathode catalyst. The nano catalyst is obtained by mixing organic dispersion solutions of potassium hypermanganate, lithium hydroxide and a carbon material through liquid-phase ultrasounds and carrying out a one-step hydrothermal reaction. Nano lithium manganite prepared by the method is uniformly loaded on the surface of the carbon material, and grains have uniform sizes and high purity. The catalyst can be applied to a metal-air battery and other energy conversion systems needing the oxygen reduction of the air electrode, and has relatively high coulombic efficiency, excellent multiplying power charge-discharge performances and good battery circulating stability; and the method for preparing the catalyst is simple, has good process repeatability, is low in cost and is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium-air batteries, in particular to a nano-lithium manganate-supported carbon material cathode catalyst for oxygen reduction of an air electrode and a preparation method thereof. Background technique [0002] The theoretical specific energy of lithium-air secondary battery is as high as 11,400Whkg -1 (excluding oxygen), as a new type of semi-open energy storage system has recently attracted widespread attention. However, lithium-air batteries face many difficulties in practical applications, such as low energy conversion efficiency, poor air electrode structure and electrolyte stability, and poor cycle reversibility. The key way to solve the above problems is to find a suitable catalyst and rationally design the electrode structure. Therefore, finding high-efficiency oxidogen / oxygen evolution bifunctional catalysts and rationally adjusting the structure of air electrodes has become a hot spot in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/9016H01M4/9083Y02E60/50
Inventor 廖世军冷利民邵奕嘉李静
Owner SOUTH CHINA UNIV OF TECH
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