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Self-repairing oxidization film-coated Na-K liquid-state alloy electrode and preparation method and application thereof

A liquid alloy and oxide film technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve Na-K liquid alloy shedding, without any solution strategy, and does not aim at stabilizing Na-K liquid alloy electrodes and electrolysis Liquid and other problems, to achieve high Coulombic efficiency, improve energy density and cycle stability

Active Publication Date: 2018-08-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at room temperature, due to the recovery of the surface tension of the Na-K liquid alloy, the exposed Na-K liquid alloy on the surface of the composite electrode fell off, indicating that the simple carbon carrier loaded Na-K liquid alloy cannot essentially solve the problem of interface stability.
[0005] At present, there is no research on the stable Na-K liquid alloy electrode and electrolyte interface at home and abroad, and there is no solution to the Na-K liquid alloy shuttle problem at home and abroad.

Method used

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  • Self-repairing oxidization film-coated Na-K liquid-state alloy electrode and preparation method and application thereof
  • Self-repairing oxidization film-coated Na-K liquid-state alloy electrode and preparation method and application thereof
  • Self-repairing oxidization film-coated Na-K liquid-state alloy electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Heat 0.1g of K metal and 0.028g of Na metal in a glove box to 450°C and melt respectively, and then use tweezers to contact carbon cloth (thickness 2mm) with a length of 1cm with the two molten metals, and take them out after they are completely absorbed. Cool to room temperature 25°C. Stack the carbon cloth loaded with K metal and Na metal respectively, and the alloying reaction of the two metals occurs on the surface of the carbon cloth, and a self-healing oxide film is formed on the surface. After a period of reaction, a self-healing oxide film is formed to cover Na-K Liquid alloy electrodes.

[0047] The XRD diffractogram of the self-repairing oxide film coating Na-K liquid alloy electrode surface that makes in embodiment 1 is as follows image 3 shown. As shown in the figure, the prepared electrode has no characteristic peaks of Na metal and K metal, indicating that the formed alloy is a liquid Na-K alloy. Also found weak KO 2 and K 2 The peak of O indicates t...

Embodiment 2

[0049] Adjust the oxygen content in the glove box to 0.2ppm, and the nitrogen content to 0.1ppm. Heat 0.2g of K metal and 0.056g of Na metal in a glove box to 400°C to melt respectively, and then use tweezers to contact the two kinds of molten metal with a carbon cloth (thickness 2mm) of 1cm in length and width. Cool to room temperature 25°C. Stack the carbon cloth loaded with K metal and Na metal respectively, and the alloying reaction of the two metals occurs on the surface of the carbon cloth, and a self-healing oxide film is formed on the surface. After a period of reaction, a self-healing oxide film is formed to cover Na-K Liquid alloy electrodes.

[0050] The XRD diffraction pattern that obtains electrode is similar to embodiment 1, finds in addition a small amount of KN 3 peak.

Embodiment 3

[0052] Heat 0.2g of K metal and 0.056g of Na metal in a glove box to 400°C to melt respectively, and then use tweezers to contact the two kinds of molten metal with a carbon cloth (thickness 2mm) of 1cm in length and width. Cool to room temperature 25°C. Immerse the carbon cloth loaded with K metal and Na metal respectively in the electrolyte (the solute is KPF with a molar ratio of 1:1 6 and NaPF 6 ; The organic solvent is a solution composed of ethylene carbonate (EC) and dimethyl carbonate (DMC) at a volume ratio of 1:1, KPF 6 and NaPF 6 The concentration in the electrolyte is 1mol / L), and stacked, the alloying reaction of the two metals occurs on the surface of the carbon cloth, and a self-repairing oxide film with new components is formed on the surface. After a period of reaction, a self-repairing oxide film is formed. The oxide film covers the Na-K liquid alloy electrode.

[0053] The obtained XRD diffraction pattern of the electrode is similar to that of Example 1,...

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Abstract

The invention discloses a high-efficiency self-repairing oxidization film-coated Na-K liquid-state alloy electrode, a preparation method and application of the self-repairing oxidization film-coated Na-K liquid-state alloy electrode used as a negative electrode. Under protection of inert gas, metal K and metal Na are respectively heated until being molten, a conductive carrier is in contact with metal, the conductive carrier is slowly wetted by the molten metal, the conductive carrier of loading the metal K and the metal Na is obtained by cooling to a room temperature, and the self-repairing oxidiation film-coated Na-K liquid-state alloy electrode having a stable structure is prepared under a room temperature by a physical lamination alloy method. The electrode comprises the conductive carrier, Na-K liquid-state alloy and a self-repairing oxidization film, wherein the Na-K liquid-state alloy is absorbed onto the carrier, and the self-repairing oxidization film is arranged on the surface. The electrode has the characteristics of high coulombic efficiency, no dendritic growth, structure stability and the like and can be simultaneously used as a potassium metal negative electrode anda sodium metal negative electrode, and the energy density and the cycle stability of all batteries are remarkably improved when the electrode is matched with a positive electrode material such as sulfur and Prussian blue.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for alkali metal secondary batteries, in particular to a self-repairing oxide film-coated Na-K liquid alloy electrode, a preparation method thereof, and an application as negative electrode materials for alkali metal secondary batteries. Background technique [0002] With the popularity of new energy vehicles and mobile electronic devices, there is an urgent need to develop batteries with high specific capacity, high safety, long cycle life, and low cost. As a new type of energy storage device, alkali metal secondary batteries have the characteristics of large reserves, low preparation cost, and wide electrochemical window, and have broad application prospects in the fields of mobile communications, electric vehicles, and energy storage. Among them, the alkali metal negative electrode has a higher specific capacity than carbon materials, metal oxides, etc., but the alkali meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/66
CPCH01M4/38H01M4/662Y02E60/10
Inventor 夏新辉章理远王秀丽涂江平
Owner ZHEJIANG UNIV
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