Double-layer composite structure ceramic, preparation method of the ceramic, self-adsorption lithium-air battery and preparation method of the battery

A lithium-air battery, double-layer composite technology, which is applied to fuel cell type half cells and secondary battery type half cells, battery electrodes, structural parts, etc. The method is simple and the effect of improving the discharge capacity

Active Publication Date: 2021-12-10
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims to solve the problem of continuous consumption of water in traditional water-based lithium-air batteries, but it is inconvenient to add in time, and now provides double-layer composite structure ceramics, a preparation method of the ceramics, a self-adsorption lithium-air battery and a preparation method of the battery

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  • Double-layer composite structure ceramic, preparation method of the ceramic, self-adsorption lithium-air battery and preparation method of the battery
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specific Embodiment approach 1

[0039] Specific Embodiment 1: The double-layer composite structure ceramic described in this embodiment includes a porous layer and a dense layer sequentially stacked from bottom to top, and the material of the double-layer composite structure ceramic is:

[0040] Li 1+x m x Ti 2-x (PO 4 ) 3 , 0≤x≤0.5, M is Al, Ga, In or Sc;

[0041] Or, Li 1+x al x Ge 2-x (PO 4 ) 3 , 0≤x≤1.2;

[0042] Or, Li 7-x La 3 Zr 2-x N x o 12 , 0≤x≤1.2, N is Al or Ta;

[0043]On the inner pore wall of the porous layer, an electronic conductive layer, a catalyst layer and a water vapor adsorption layer are uniformly deposited in sequence.

[0044] In this embodiment, the material of the electronically conductive layer is: nano-carbon powder, graphene, mesoporous carbon, carbon nanotube, amorphous carbon, multilayer graphite, conductive macromolecular material, conductive metal, conductive polymer or electronically conductive Sexual functional ceramics, such as: ABO 3 , wherein, A is La...

specific Embodiment approach 2

[0049] Embodiment 2: This embodiment is a further description of the double-layer composite structure ceramic described in Embodiment 1. In this embodiment, the material of the water vapor adsorption layer is deliquescent salt or superabsorbent resin.

[0050] Superabsorbent resin is a synthetic resin with hydrophilic groups, which can absorb a large amount of water and swell and keep water from flowing out, such as starch grafted acrylate, grafted acrylamide, high degree of substitution cross-linked carboxymethyl fiber Elements, cross-linked methyl cellulose grafted with acrylamide, cross-linked light ethyl cellulose grafted with acrylamide polymer, etc.

specific Embodiment approach 3

[0051] Specific embodiment three: This embodiment is a further description of the double-layer composite structure ceramics described in specific embodiment one. In this embodiment,

[0052] The density of the dense layer is greater than 90%, and the thickness of the dense layer is 10 μm to 50 μm.

[0053] The porosity of the porous layer is greater than 50%, and the thickness of the porous layer is 200 μm˜1000 μm.

[0054] In this embodiment, the higher the density of the dense layer, the better, and the thinner the dense layer, the better. The pores in the porous layer increase sequentially along the direction away from the dense layer. Preferably, a gradually changing gradient pore structure is formed in the porous layer.

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Abstract

A double-layer composite structure ceramic, a preparation method of the ceramic, a self-adsorption lithium-air battery and a preparation method of the battery relate to the technical field of lithium-air batteries. The invention aims to solve the problem that the water in the traditional water-based lithium-air battery is continuously consumed but it is inconvenient to add it in time. The invention adopts dry pressing, spin coating, and sintering methods to successfully realize the preparation of a double-layer composite structure electrolyte, and uses the methods of impregnation and vacuum drying to prepare a water vapor adsorption layer in the porous electrode, and uses the water vapor adsorption layer to achieve water absorption and water retention. Objective To solve the problem of water addition in aqueous lithium-air batteries. The invention is applicable to the field of preparation of self-adsorption lithium-air batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-air batteries. Background technique [0002] With the development of society and the advancement of science and technology, the demand for portable mobile energy storage devices is increasing worldwide, and the capacity requirements for energy storage batteries are also increasing. Taking new energy vehicles as an example, the current lithium battery technology still cannot meet the popularization requirements of electric vehicles. Relevant data show that in order to achieve commercialization of electric vehicles, the battery energy density needs to reach at least 250Wh / kg, but the current energy density of lithium batteries for electric vehicles is generally less than 100Wh / kg. The development of large-capacity mobile power supply is imminent. [0003] Recently, an upgraded product of lithium-ion batteries, the "lithium-air battery", has attracted widespread attention from both academia and ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M12/08
CPCH01M4/664H01M12/08Y02E60/10
Inventor 朱星宝王宇杨田鄢莹璋吴元果何向磊
Owner HARBIN INST OF TECH
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