Double-cathode structure and lithium-oxygen battery prepared from double-cathode structure

A dual-cathode and cathode technology, applied in battery electrodes, structural parts, fuel cell-type half-cells and secondary battery-type half-cells, etc., can solve the problem of increased battery charging potential, deterioration of battery cycle conditions, and positive electron transfer. Limitation and other issues, to achieve the effect of improving cycle life, reducing by-product formation, and reducing charging potential

Active Publication Date: 2021-04-02
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fundamental reason is that during the operation of the battery, by-products and undecomposed Li 2 o 2 Continuous accumulation at the cathode creates a non-conductive passivation layer, resulting in limited electron transfer at the positive electrode
Liquid-phase catalyst molecules cannot be quickly regenerated, resulting in a continuous increase in the charging potential of the battery, further deteriorating the battery cycle condition

Method used

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  • Double-cathode structure and lithium-oxygen battery prepared from double-cathode structure
  • Double-cathode structure and lithium-oxygen battery prepared from double-cathode structure
  • Double-cathode structure and lithium-oxygen battery prepared from double-cathode structure

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A method for assembling a lithium-oxygen battery with a double-cathode structure, the process is as follows:

[0043] (1) Preparation of electrolyte: LiTFSI, DBBQ, and TEMPO were dissolved in TEGDME to obtain electrolyte; the concentrations of LiTFSI, DBBQ, and TEMPO in TEGDME were 1 mol / L, 0.05 mol / L, and 0.2 mol / L, respectively;

[0044] (2) Preparation of the inner cathode: cut the carbon film into a disc with a diameter of 1.6 cm, and then dry it in a vacuum oven at 80 °C for 24 hours;

[0045] (3) Preparation of the gas barrier layer: the polypropylene film was cut into discs with a diameter of 1.6 cm. The porosity of the original barrier layer was 15% as measured by the scanning electron microscope; at the same time, for comparison, two other discs with a diameter of 1.6 cm were prepared. cm polypropylene membrane discs, two discs were treated by a plasma cleaning machine (power 11W) at room temperature for 5 min and 10 min respectively to obtain gas barrier layer...

Embodiment 2

[0051] A method for assembling a lithium-air battery with a double-cathode structure, the process is as follows:

[0052] The difference from Example 1 is that the gas atmosphere in step (7) is air with a humidity of 25%. The production process of the battery is as follows: assemble the above-mentioned single-cathode lithium-oxygen battery and double-cathode lithium-oxygen battery in an argon-filled glove box, package, and then transfer the battery to an air atmosphere with a humidity of 25%, let it stand for four hours, and seal it , and tested in a constant temperature oven at a temperature of 30°C.

Embodiment 3

[0054] A preparation method of a conventional lithium-oxygen battery, the process is as follows:

[0055] The difference from Example 1 lies in the preparation of the electrolyte in step (1): dissolving LiTFSI in TEGDME to obtain an electrolyte; the concentration of LiTFSI is 1 mol / L.

[0056] The difference from Example 1 is that there is no PSS-Li / GO-Li / GF separator and no gas barrier layer in step (6). That is, the assembly sequence of a conventional lithium-oxygen battery is a lithium sheet, a glass fiber separator soaked in 90 μL of the above-mentioned LiTFSI electrolyte, an inner cathode, and an outer cathode.

[0057] To study the discharge electrodes after cycling, the cells were disassembled in an Ar-filled glove box. Carefully remove the electrode and immerse it in ethylene glycol dimethyl ether (DME) for about 6 h. The dipping process is then repeated several times to completely remove the electrolyte. Thereafter, the electrodes were placed in a vacuum chamber to...

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Abstract

The invention discloses a double-cathode structure and a lithium-oxygen battery prepared from the double-cathode structure. The double-cathode structure comprises an inner-layer cathode, a gas barrierlayer and an outer-layer cathode. The double-cathode structure is applied to the lithium-oxygen battery, the inner-layer cathode provides a new electron transfer channel for activation of a liquid-phase catalyst, continuous low charging voltage of the battery is guaranteed, and then side reactions are reduced. The deposition of Li2O2 in the inner-layer cathode is prevented through the gas barrierlayer, so that the effective conduction of electron transfer between the inner-layer cathode and the liquid-phase catalyst is ensured. The outer cathode has the effects of transferring electrons andstoring Li2O2 discharge products. According to the lithium oxygen battery with the double-cathode structure, the problem that a liquid-phase catalyst cannot be activated due to accumulation of byproducts on the cathode of the traditional lithium oxygen battery is solved, and the double-cathode structure is an advanced lithium oxygen battery structure so far.

Description

technical field [0001] The invention belongs to the technical field of lithium-oxygen batteries, and in particular relates to a double-cathode structure and a lithium-oxygen battery prepared by using the structure. Background technique [0002] The theoretical energy density of aprotic lithium-oxygen battery is as high as 3500 Wh kg -1 , which is an order of magnitude higher than the current commercial lithium-ion battery energy density, so it has broad application prospects in electric vehicles, portable power supplies and other fields. [0003] Lithium-oxygen battery discharge product Li 2 o 2 The inherent low electronic conductivity of lithium batteries and the presence of active intermediates in the positive electrode reaction process lead to limited electron transfer and a large number of side reactions in the positive electrode reaction, resulting in limited cycle life and specific capacity of the battery, which restricts the practical application of lithium oxygen b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M12/08
CPCH01M4/8605H01M4/8657H01M12/08H01M2004/8689Y02E60/10
Inventor 赵勇韩庆
Owner HENAN UNIVERSITY
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