Zinc negative electrode with zinc ion conductivity interface modification layer, battery and preparation method

An interface modification layer and interface modification technology, which is applied in the direction of electrode manufacturing, chemical electrode manufacturing, battery electrodes, etc., can solve the problem of lack of zinc ion conductivity, the inability to fundamentally control the uniform diffusion of zinc ions, the dendrite growth trend, and ion migration. Obstacles and other issues

Active Publication Date: 2020-11-13
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

These interface modification layers can usually isolate the direct contact between the electrolyte and the metal zinc anode to inhibit the occurrence of side reactions, and inhibit the growth of dendrites through physical barriers, but because the interface modification material itself does not have the conductivity of zinc ions, it cannot be achieved. The chemical regulation of zinc ions at the interface of zinc anode means that the uniform diffusion of zinc ions cannot be fundamentally controlled and the growth tendency of dendrites can be inhibited
For example, a layer of TiO is deposited on the surface of the zinc anode by single atom deposition technology (Atomic Layer Deposition, ALD). 2 , effectively solve the problem of side reactions at the interface between the zinc anode and the electrolyte, and improve the interface stability of the zinc anode, but similar inorganic oxide materials do not have zinc ion conductivity, which will hinder the migration of ions. As a result, performance optimization at high current densities cannot be achieved
In addition, this method requires high equipment and high cost, which limits its commercial mass production (Advanced Materials Interfaces, 2018, 5, 1800848)

Method used

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  • Zinc negative electrode with zinc ion conductivity interface modification layer, battery and preparation method
  • Zinc negative electrode with zinc ion conductivity interface modification layer, battery and preparation method
  • Zinc negative electrode with zinc ion conductivity interface modification layer, battery and preparation method

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Effect test

Embodiment 44

[0060] will V 2 o 5 ·nH 2 O dispersion liquid (solvent is dehydrated alcohol) obtains V by suction filtration on the nylon filter membrane by the method for vacuum suction filtration. 2 o 5 ·nH 2 O film, first with V on nylon filter 2 o 5 ·nH 2 Electrolyte (2M ZnSO 4 ), and place it directly against the metal zinc foil, and then apply a pressure of 20Mpa to the two to make them fully contact to form a short-circuit primary battery, and a redox reaction occurs. During the reaction, the metal zinc is oxidized to form zinc ions and at V 2 o 5 ·nH 2 Intercalation of O layers to form Zn x V 2 o 5 ·nH 2 O, finally peel off the nylon filter, V 2 o 5 ·nH 2 The O thin film was successfully transferred from the nylon filter membrane to the metal zinc surface, and a layer of Zn with zinc ion conductivity with a thickness of about 5 μm was formed on the zinc metal zinc surface. x V 2 o 5 ·nH 2 O interface modification layer.

[0061] image 3 is the Zn prepared in Ex...

Embodiment 45

[0064] Na 1.1 V 3 o 7.9 Dispersion liquid (solvent is isopropanol, adds the PTFE of 10% mass fraction as binding agent) by the method for spraying on glass and obtains Na 1.1 V 3 o 7.9 film, first on the glass with Na 1.1 V 3 o 7.9 Wetting solution (2M ZnSO 4 ), and place it directly against the metal zinc foil, and then apply a pressure of 10Mpa to the two to make them fully contact to form a short-circuit primary battery, a redox reaction occurs, and the metal zinc is oxidized to form zinc ions during the reaction process. 1.1 V 3 o 7.9 embedded in the material to form Zn x Na1.1 V 3 o 7.9 , and finally remove the glass, Zn x Na 1.1 V 3 o 7.9 The film was successfully transferred from the glass to the metal zinc surface, and a layer of Zn with zinc ion conductivity with a thickness of about 13 μm was formed on the zinc metal zinc surface. x Na 1.1 V 3 o 7.9 Interface modification layer. The prepared Zn x Na 1.1 V 3 o 7.9 The interface layer modificat...

Embodiment 46

[0066] Na 2 V 6 o 16 1.63H 2 The O dispersion (the solvent is acetone) is vacuum-filtered on the eggshell membrane to obtain Na 2 V 6 o 16 1.63H 2 O thin film, first with Na on the eggshell membrane 2 V 6 o 16 1.63H 2 Wetting solution (0.5M NaCl) is added to one side of the O film, and it is placed directly against the metal zinc foil, and then a pressure of 15Mpa is applied to the two to make them fully contact to form a short-circuit primary battery, and a redox reaction occurs. The reaction process The metal zinc is oxidized to form zinc ions and in Na 2 V 6 o 16 1.63H 2 O material intercalated to form Zn x Na 2 V 6 o 16 1.63H 2 O, finally remove the eggshell membrane, Zn x Na 1.1 V 3 o 7.9 The film was successfully transferred from the eggshell membrane to the metal zinc surface, and a layer of Zn with zinc ion conductivity with a thickness of about 2 μm was formed on the zinc metal surface. x Na 2 V 6 o 16 1.63H 2 O interface modification layer....

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Abstract

The invention provides a zinc negative electrode with a zinc ion conductivity interface modification layer, a battery and a preparation method, and belongs to the field of aqueous zinc battery metal zinc cathodes. The preparation method comprises: in air atmosphere, pre-constructing an interface modification material M on a base membrane; in a soaking environment by a wetting liquid, the interfacemodification material M layer on the base film being in close contact with the metal zinc to form the short-circuit primary battery, and the contacted interface modification material M and the metalzinc having spontaneous redox reaction, to make the interface modification material convert to ZnxM with zinc ion conductivity from M, meanwhile, transferring the interface modification material layerto the surface of the metal zinc negative electrode from the base film, and finally, obtaining the metal zinc negative electrode with the ZnxM interface modification layer with zinc ion conductivityon the surface. The ZnxM interface modification layer with the zinc ion conductivity can effectively inhibit dendritic crystal growth of a zinc negative electrode during charging and discharging of azinc battery, so that the interface stability of a metal zinc negative electrode is improved, and meanwhile, the cycling stability of a water-based zinc battery is improved. The method is simple and has a good actual effect.

Description

technical field [0001] The invention belongs to the field of metal zinc negative electrodes of water-based zinc ion batteries, and in particular relates to a zinc negative electrode with a zinc ion conductive interface modification layer, a battery and a preparation method. Background technique [0002] With the rapid development of modern society, the ever-increasing energy demand and the increasingly serious environmental pollution problems promote the continuous development of green and sustainable energy. As a new generation of new energy electrochemical energy storage devices, lithium-ion batteries are playing an increasingly important role in the field of energy storage and conversion. However, the high cost and safety problems of lithium-ion batteries in practical applications limit their development in large-scale power grids and electric vehicles. It prompts people to look for a new type of secondary battery energy storage device that is expected to replace lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/42H01M4/04H01M10/36
CPCH01M4/049H01M4/36H01M4/366H01M4/42H01M10/36Y02E60/10
Inventor 李会巧薛澜澜肖娉翟天佑
Owner HUAZHONG UNIV OF SCI & TECH
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