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Composite metal lithium negative electrode, preparation method and metal lithium battery

A technology of composite metal and lithium negative electrode, which is applied in the direction of lithium battery, battery electrode, electrode carrier/current collector, etc., to reduce the average current density, prolong the cycle life, and alleviate the volume expansion.

Active Publication Date: 2020-01-03
BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of dendrite growth and bulk phase pulverization on the surface of the existing lithium metal negative electrode, the present invention provides a three-dimensional framework material with surface modification as the matrix of the composite lithium negative electrode. The lithium-friendly surface can promote the uniform deposition of lithium , and the three-dimensional framework can alleviate the volume expansion, thereby effectively improving the cycle stability of the composite lithium anode

Method used

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  • Composite metal lithium negative electrode, preparation method and metal lithium battery
  • Composite metal lithium negative electrode, preparation method and metal lithium battery
  • Composite metal lithium negative electrode, preparation method and metal lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Add 0.75g of polyvinylpyrrolidone (K30) and 2.5mL of concentrated hydrochloric acid into 30mL of methanol, and stir well. Immerse foamed nickel in the above solution, ultrasonicate for 30min, wash with water and methanol, and set aside. Add 1.2g of zinc nitrate hexahydrate and 1g of 2-methylimidazole into 30mL of methanol, stir to dissolve. Immerse the pretreated nickel foam in the above solution, let it stand at room temperature for 6h, wash it with methanol, and let it dry naturally. The coated nickel foam was calcined in an argon atmosphere at 600°C for 3h with a heating rate of 5°C / min.

[0039] The scanning electron micrographs of the composite base material prepared above are as follows: figure 1 shown. It can be seen that the coating layer is well dispersed on the three-dimensional current collector framework, and the particle size is uniform.

[0040] The transmission electron micrograph of the cladding layer of the composite substrate material prepared abov...

Embodiment 2

[0045] Add 0.75g of polyvinylpyrrolidone (K30) and 2.5mL of concentrated hydrochloric acid into 30mL of methanol, and stir well. Immerse foamed nickel in the above solution, ultrasonicate for 30min, wash with water and methanol, and set aside. Add 1.2g of cobalt nitrate hexahydrate and 1g of adipic acid into 30mL of methanol and stir to dissolve. Immerse the pretreated nickel foam in the above solution, let it stand at room temperature for 6h, wash it with methanol, and let it dry naturally. The coated nickel foam was calcined in an argon atmosphere at 600°C for 3h with a heating rate of 5°C / min.

[0046] The above-mentioned covered and calcined foamed nickel is used as the positive electrode, and the metal lithium sheet is used as the negative electrode to assemble a half-cell, and the metal lithium is deposited on the substrate by an electrochemical deposition method. The electrolyte of the battery is a solution of ethylene glycol dimethyl ether and 1,3-dioxolane (volume r...

Embodiment 3

[0048] Following Example 1, only 2-methylimidazole was replaced by terephthalic acid. Deposit two sheets of 10mAh / cm 2 The composite lithium negative pole of metal lithium is assembled into symmetrical battery as the two poles of battery, and battery electrolyte is the ethylene glycol dimethyl ether containing 1mol / L lithium trifluoromethanesulfonylimide and 1,3-dioxolane (volume ratio 1:1) solution. The charge-discharge cycle test is carried out at a current density of 2mA / cm2, and the amount of lithium cycled is 1mAh / cm2 2 .

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Abstract

The invention discloses a composite metal lithium negative electrode, a preparation method and a metal lithium battery. The metal lithium negative electrode is composed of a three-dimensional currentcollector frame and a surface coating layer, wherein the three-dimensional current collector frame is used as a matrix of the composite lithium negative electrode, so volume expansion of lithium metalin the circulation process can be effectively relieved, the average current density can be reduced due to the high specific surface area, uneven deposition of lithium is further inhibited, the metaloxide nano-particle sites in a surface coating layer can form alloy with lithium metal in situ in the circulation process and further serve as reversible lithium deposition sites, polarization of lithium deposition is reduced, and uniform intercalation and deintercalation of lithium can be induced. The metal lithium negative electrode is advantaged in that a method of combining a porous skeleton and a surface lithium-philic modification layer is adopted, so a problem that it is difficult to consider the bulk phase pulverization and uneven interface growth in a lithium metal anode in the priorart is solved, and an effective thought is provided for actual industrialization of a lithium metal negative electrode.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a composite metal lithium negative electrode based on a surface-coated three-dimensional frame structure, a preparation method and a metal lithium battery. Background technique [0002] In recent years, lithium-ion batteries have been widely used in many aspects of human life, and have shown attractive application prospects in the new energy industry, especially in the field of electric vehicles. However, traditional commercial lithium-ion batteries based on intercalation chemistry are difficult to meet the high energy density requirements of power batteries, and the development of new high-capacity and long-life lithium battery systems is imminent. Compared with traditional graphite anodes, lithium metal anodes have a high theoretical specific capacity (3860mA h g -1 ), low density (0.59g cm -3 ) and low electrode potential (-3.04Vvs.H + / H 2 ) advantages, has ...

Claims

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Application Information

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IPC IPC(8): H01M4/70H01M4/134H01M4/1395H01M10/052
CPCH01M4/134H01M4/1395H01M4/70H01M10/052Y02E60/10
Inventor 吴恺王骞杨程凯刘文周恒辉
Owner BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD
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