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Preparation method and application of two-dimensional lithium metal

A technology of metal lithium and compression method, which is applied in metal rolling, electrode manufacturing, electrode forming, etc., can solve the problems of battery fire and coulombic efficiency reduction, improve cycle life, solve lithium dendrite growth problems, and suppress unevenness The effect of sedimentation

Pending Publication Date: 2021-06-15
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of lithium dendrites caused by uneven deposition of lithium ions during the charge-discharge cycle of lithium batteries will not only reduce the Coulombic efficiency, but also the excessive growth of lithium dendrites will even penetrate the separator, causing a short circuit between the positive and negative electrodes. , causing safety accidents such as battery fires

Method used

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  • Preparation method and application of two-dimensional lithium metal
  • Preparation method and application of two-dimensional lithium metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First, put the metal lithium sheet with a thickness of 1-2 mm into a glove box filled with argon, and compress and deform the metal lithium sheet under the pressure of the indenter, and the deformation amount is 30%;

[0025] In the glove box, the metal lithium sheet is compressed and deformed by the pressure of the indenter, and the deformation is 30%;

[0026] Repeat steps (1) and (2) until the thickness of the lithium metal sheet reaches below 20 microns to obtain a two-dimensional lithium metal sheet;

[0027] The two-dimensional metal lithium sheet is used as the negative electrode, the manganese oxide is used as the positive electrode, and Li-O 2 Battery. Test Results figure 1 As shown in (b), the discharge capacity (800-950mAh / g) of the two-dimensional metal lithium electrode is significantly higher than that of the three-dimensional metal lithium electrode (300-400mAh / g), and the cycle life is significantly improved. The scanning electron microscope images of...

Embodiment 2

[0029] (1) First put the metal lithium sheet with a thickness of 1 to 2 mm into a glove box filled with argon, and compress and deform the metal lithium sheet through the pressure of the indenter in the metal mold, and the deformation amount is 30%;

[0030] (2) In the glove box, the metal lithium sheet is compressed and deformed by the pressure of the indenter in the metal mold, and the deformation is 30%;

[0031] (3) Repeat steps (1) and (2) until the thickness of the lithium metal sheet reaches below 20 microns to obtain a two-dimensional lithium metal sheet;

[0032] (4) Assemble a lithium-sulfur battery with a two-dimensional metal lithium sheet as the negative electrode and elemental sulfur as the positive electrode.

[0033] The discharge capacity (600-800mAh / g) of the two-dimensional metal lithium electrode is obviously higher than that of the three-dimensional metal lithium electrode (300-400mAh / g), and the cycle life is obviously improved.

Embodiment 3

[0035] (1) First put the lithium metal sheet with a thickness of 1 to 2mm into a glove box filled with argon, and compress and deform the lithium metal sheet under the pressure of the roll, and the deformation amount is 30%;

[0036] (2) In the glove box, the metal lithium sheet is compressed and deformed by the pressure of the roll, and the amount of deformation is 30%;

[0037] (3) Repeat steps (1) and (2) until the thickness of the lithium metal sheet reaches below 20 microns to obtain a two-dimensional lithium metal sheet;

[0038] (4) Assemble a lithium-sulfur battery with a two-dimensional metal lithium sheet as the negative electrode and elemental sulfur as the positive electrode.

[0039] The discharge capacity (650-800mAh / g) of the two-dimensional metal lithium electrode is obviously higher than that of the three-dimensional metal lithium electrode (300-400mAh / g), and the cycle life is obviously improved.

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Abstract

The invention discloses a preparation method of two-dimensional lithium metal and application of the two-dimensional lithium metal in new energy batteries such as lithium-sulfur batteries and lithium-air batteries. The preparation method of the two-dimensional lithium metal comprises the following steps of preparing the two-dimensional lithium metal in a free compression manner in a protective atmosphere environment; preparing the two-dimensional lithium metal in a mold compression manner; preparing the two-dimensional lithium metal in a rolling manner; preparing the two-dimensional lithium metal in an extrusion manner; and preparing the two-dimensional lithium metal in a shearing manner. The prepared two-dimensional lithium metal can be used as a negative electrode of a lithium-sulfur battery or a lithium-air battery, so that lithium ions are uniformly nucleated and grow on the surface of the two-dimensional lithium metal, the phenomenon of non-uniform deposition of the lithium ions is inhibited, and the problem of lithium dendrite growth of the lithium-sulfur battery or the lithium-air battery is solved, so that the cycle life of the lithium-sulfur battery or the lithium-air battery is remarkably prolonged.

Description

technical field [0001] The invention belongs to the field of new energy batteries, and in particular relates to a preparation method of two-dimensional metallic lithium and its application in new energy batteries such as lithium-sulfur batteries and lithium-air batteries. Background technique [0002] Lithium metal has a high theoretical specific capacity and the lowest electrochemical potential, and is recognized as the most promising anode material for next-generation high-energy-density batteries. However, the problem of lithium dendrites caused by uneven deposition of lithium ions during the charge-discharge cycle of lithium batteries will not only reduce the Coulombic efficiency, but also the excessive growth of lithium dendrites will even penetrate the separator, causing a short circuit between the positive and negative electrodes. , causing safety accidents such as battery fire. [0003] Lithium metal has good plastic deformation characteristics. After repeated defor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21H8/00H01M4/04H01M4/88
CPCB21H8/00H01M4/043H01M4/0433H01M4/8875Y02E60/10Y02E60/50
Inventor 赵红张勇于丹丹
Owner DALIAN JIAOTONG UNIVERSITY
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