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A visualized method for in situ preparation of lithium superoxide

A lithium superoxide, in-situ preparation technology, applied in the direction of lithium oxide;/hydroxide, fuel cell half-cell and secondary battery-type half-cell, vacuum evaporation plating, etc., can solve the problem of unstable existence And other issues

Active Publication Date: 2022-04-01
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this regard, Luo Langli et al. have tried to use RuO in environmental electron microscopy 2 / Carbon nanotubes are used as the positive electrode material to construct a solid-state lithium-air battery. It was observed in situ that lithium superoxide will be produced during the oxygen reduction reaction. However, it cannot exist stably, and it is not a stable and repeatable generation of LiO. 2 method (refer to Nat.Nanotech.2017, 12(6), 535-539)

Method used

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  • A visualized method for in situ preparation of lithium superoxide
  • A visualized method for in situ preparation of lithium superoxide
  • A visualized method for in situ preparation of lithium superoxide

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preparation example Construction

[0029] The visualized lithium superoxide in-situ preparation method of the present invention prepares lithium superoxide in an all-solid-state nano battery, and has the following steps:

[0030] In the positive electrode material preparation process, one or more alloys selected from Au, Ag, and Pd are uniformly loaded on the surface of the carbon nanotubes and used as the positive electrode material.

[0031] In the assembly process, in a closed and transparent container, the positive electrode material prepared above is fixed on one end of the double-probe energized sample rod, the Li metal is installed on the other end of the sample rod, and the positive electrode material is bonded to the Li metal to form an all-solid state Battery.

[0032] In the synthesis process, the double-probe energized sample rod equipped with an all-solid-state battery in a closed and transparent container is placed in the observation room of the transmission electron microscope, oxygen is introduc...

Embodiment 1

[0044] Lithium superoxide preparation in Au / carbon nanotube-catalyzed lithium-air batteries;

[0045] The positive electrode material preparation process includes highly dispersed Au on carbon nanotubes. This material is synthesized by magnetron sputtering. Heat and dry at 120°C on a heating platform. Put the high-purity Au (purity>99.99%) target into the magnetron sputtering apparatus (ISC-200, Beijing Lupingyuan Vacuum Technology Co., Ltd.), and put the aluminum shovel sticking carbon nanotubes into it, Adjust the working current of the sputtering apparatus to 10mA, and spray Au (sputtering) for 15s. The current and vacuum degree during sputtering are controlled so that the Au nanoparticles have a size of 2nm-5nm and are uniformly dispersed on the carbon nanotubes. In this way, the Au / carbon nanotube composite catalyst can be prepared.

[0046] Experimental steps of assembly procedure and synthesis procedure:

[0047] Fix the Au / carbon nanotubes on the sample end of the ...

Embodiment 2

[0050] Preparation of lithium superoxide in lithium-air batteries with Ag / carbon nanotubes as positive electrode materials;

[0051] The positive electrode material preparation process includes highly dispersed Ag on carbon nanotubes, and this material is synthesized by magnetron sputtering. The steps are as follows: the carbon nanotubes prepared by arc discharge are glued to a flattened aluminum shovel with conductive silver, and heated and dried at 120° C. on a heating platform. Put the high-purity Ag (purity > 99.99%) target into the magnetron sputtering apparatus, and put the aluminum shovel sticking carbon nanotubes into it, adjust the working current of the sputtering apparatus to 10mA, and the time is 10s. Ag spray treatment was performed. The size of the Ag nanoparticles is controlled to be 2nm-5nm, and they are evenly dispersed on the carbon nanotubes. In this way, the Ag / carbon nanotube composite catalyst can be prepared.

[0052] The experimental steps of the ass...

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Abstract

The invention discloses a visualized in-situ preparation method of lithium superoxide, which belongs to the technical field of lithium-air batteries. In the present invention, precious metals gold (Au), silver (Ag) and palladium (Pd) are used as catalysts to be composited with carbon nanotubes respectively, and the composite material is used for the air electrode of an all-solid-state lithium-air battery, and is carried out in an environmental electron microscope. prepared and observed the nucleation and growth process of lithium superoxide. The preparation method of the composite material is simple, can effectively catalyze the production of superoxide, and the method of real-time observation by using an in-situ environmental electron microscope is advanced and easy to operate. The invention effectively solves the problem of product generation in lithium-air batteries.

Description

Technical field: [0001] The invention belongs to the technical field of lithium-air batteries, and in particular relates to a method for visually in-situ preparing lithium superoxide in catalytic nanometer lithium-air batteries. Background technique: [0002] Lithium-air batteries have attracted the most attention, mainly because lithium is the lightest metal. This means it has the highest theoretical capacity (3862Ah kg -1 ), equivalent to an energy density of 11,680Wh kg -1 , the potential is about 3.0V. Even based on the consideration of the whole battery system, the energy density is 1000Wh kg -1 Lithium-ion battery is still [8] several times that of gasoline, showing great potential to completely replace gasoline in gasoline. [0003] Due to the different electrolytes, four different types of Li-air batteries have been proposed and developed: non-aqueous, aqueous, hybrid non-aqueous / aqueous, and solid-state Li-air batteries. One of the typical non-aqueous lithium-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M12/08
CPCC01D15/02C23C14/35C23C14/18H01M12/08C01P2002/72C01P2004/01
Inventor 黄建宇杨婷婷唐永福张利强
Owner YANSHAN UNIV