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Metal negative electrode material and preparation method thereof

A metal anode and metal technology, applied in electrode manufacturing, battery electrodes, electrical components, etc., can solve problems such as unfavorable use of metal anode materials, and achieve the effects of inhibiting metal dendrite growth, stable structure, and long cycle life

Inactive Publication Date: 2020-11-03
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the technical problem that the existing metal negative electrode materials are not conducive to use, the invention provides a metal negative electrode material and a preparation method thereof

Method used

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  • Metal negative electrode material and preparation method thereof
  • Metal negative electrode material and preparation method thereof
  • Metal negative electrode material and preparation method thereof

Examples

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preparation example Construction

[0028] Such as Figure 1~Figure 3 As shown, the invention provides a kind of preparation method of metal negative electrode material, comprises the following steps:

[0029] dripping liquid mercury onto metal surfaces;

[0030] Wetting metal surfaces with liquid mercury;

[0031] After the liquid mercury reacts with the metal, a self-healing film containing amalgam is formed, thereby obtaining a metal negative electrode material.

[0032] In the embodiment of the present invention, a metal anode material containing an amalgam alloy layer with a dense structure and a uniform surface is prepared through an in-situ surface alloy reaction; the amalgam alloy layer effectively reduces the damage to the structure of the metal electrode itself caused by volume expansion during the cycle , and in the process of intercalating metal ions, a reversible phase transition occurs, which can better inhibit the growth of metal dendrites, prevent the direct reaction between the electrolyte and...

Embodiment 1

[0044] According to a certain mass ratio, use an electronic balance to weigh 1 part of amalgam, 1 part of solid electrolyte or 1 part of metal aluminum foil in the glove box, place the weighed aluminum foil and solid electrolyte in stainless steel trays, and drip with a glue head. The metal mercury is dropped onto the surface of metal or solid electrolyte, and after wetting the metal surface, a metal anode material containing amalgam film is obtained.

[0045] The present invention uses a Hitachi S-3400 (II) scanning electron microscope to observe the morphology of the material powder. Such as figure 1(a~c) in. It can be seen from the figure that the liquid amalgam can completely wet the surface of the solid electrolyte and the surface of metal aluminum, realizing the close combination of amalgam, solid electrolyte and metal aluminum, and the surface of the prepared amalgam film is flat and smooth.

[0046] The invention uses a LAND battery test system to test the cycle volt...

Embodiment 2

[0048] According to a certain mass ratio, weigh 1 part of amalgam and 1 part of metal magnesium foil with an electronic balance in the glove box, place the weighed magnesium foil in a stainless steel tray, and drop the metal mercury onto the metal with a rubber dropper. After wetting the metal surface, a metal anode material containing amalgam film is obtained.

[0049] The present invention uses a Hitachi S-3400 (II) scanning electron microscope to observe the morphology of the material powder. Such as figure 1 (d, e) in . It can be seen from the figure that the liquid amalgam can completely wet the surface of metal magnesium, realize the close combination of amalgam and metal magnesium, and the surface of the prepared amalgam film is flat and smooth.

[0050] The invention uses a LAND battery test system to test the cycle voltage curve of the metal negative electrode material. The test results are shown in (c, d) in Figure 2. It can be seen from the figure that the mater...

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Abstract

The invention provides a preparation method of a metal negative electrode material. The preparation method comprises the following steps: dropping liquid mercury onto the surface of metal; infiltrating the metal surface with liquid mercury; and after the liquid mercury reacts with the metal, forming a self-healing film containing amalgam, so that a metal negative electrode material is obtained. According to the embodiment of the invention, an amalgam alloy layer is prepared, the amalgam alloy layer effectively reduces the damage of the structure of a metal electrode caused by volume expansionin the circulation process, and reversible phase change occurs in the metal ion de-intercalation process, so that the performance of the metal electrode is improved. The growth of metal dendrites is well inhibited, the direct reaction between an electrolyte and a negative electrode is prevented, and the interface resistance between the electrolyte and the negative electrode is reduced, so that a metal negative electrode material of a self-healing battery with high storage capacity and long cycle life is obtained; compared with a pure metal negative electrode material, the metal negative electrode material containing the alloy protective layer is stable in structure, does not form metal dendrites in battery circulation, and has a relatively high solid-solid interface ion transmission rate.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials, in particular to a metal negative electrode material and a preparation method thereof. Background technique [0002] Due to its high energy density and low electrode potential, metal anodes have become a research hotspot for secondary battery anodes. However, limited by dendrite growth, volume expansion, and large interfacial resistance, the cycle life and safety performance of metal anodes are far from ideal. Although some methods such as the use of liquid alloy electrodes, the design and preparation of three-dimensional nanocomposite anodes, the use of ionic liquids, the surface modification of separators and electrodes, and the optimization and modification of electrolytes, the intrinsic dendrites of metal anodes can be improved. , to alleviate the huge volume expansion of the negative electrode or to increase the interfacial resistance between the solid electrolyte and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M4/1395H01M4/04
CPCH01M4/04H01M4/134H01M4/1395H01M4/366H01M4/38H01M4/382H01M4/387H01M4/62H01M4/628Y02E60/10
Inventor 陶涛邓超高雨璇范烨鲁圣国
Owner GUANGDONG UNIV OF TECH
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