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A kind of lithium alloy negative electrode material and preparation method thereof

A technology of negative electrode material and lithium alloy, applied in the field of lithium alloy negative electrode material and preparation thereof, can solve the problems of short life and low Coulomb efficiency, and achieve the effects of low cost, inhibiting the growth of lithium dendrites, and simple and feasible preparation method.

Active Publication Date: 2021-09-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the above-mentioned problems existing in the prior art, the present invention provides a lithium alloy negative electrode material and a preparation method thereof, which can effectively solve the problem of low coulombic efficiency and short service life caused by the growth of metal lithium dendrites in the lithium metal negative electrode material during the battery cycle. And other issues

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  • A kind of lithium alloy negative electrode material and preparation method thereof
  • A kind of lithium alloy negative electrode material and preparation method thereof
  • A kind of lithium alloy negative electrode material and preparation method thereof

Examples

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Embodiment 1

[0041] A metal lithium alloy negative electrode material, the preparation method of which comprises the following steps:

[0042] (1) In an environment with a dew point of -50°C and an oxygen content of 10ppm, the lithium metal is heated to 200°C, and the lithium metal is in a molten state at this time;

[0043] (2) Under the condition that the temperature is lower than the melting point of the transition metal, add the transition metal copper to the metal lithium in the molten state, keep it warm for 10 minutes, and mix well to make the metal lithium form a molten alloy state, wherein the number of atoms of copper and lithium The ratio is 1:100;

[0044] (3) cooling the metal lithium alloy in the molten state in the step (2) to room temperature within 5 minutes to prepare a lithium copper alloy CuLi100 negative electrode material.

Embodiment 2

[0046] A metal lithium alloy negative electrode material, the preparation method of which comprises the following steps:

[0047] (1) In an environment with a dew point of -60°C and an oxygen content of 2ppm, the metal lithium is heated to 200°C, and the metal lithium is in a molten state at this time;

[0048] (2) Under the condition that the temperature is lower than the melting point of the transition metal, add the transition metal copper to the metal lithium in the molten state, keep it warm for 10 minutes, and mix well to make the metal lithium form a molten alloy state, wherein the number of atoms of copper and lithium The ratio is 1:60;

[0049] (3) cooling the metal lithium alloy in the molten state in the step (2) to room temperature within 5 minutes to prepare a lithium copper alloy CuLi60 negative electrode material.

Embodiment 3

[0051] A metal lithium alloy negative electrode material, the preparation method of which comprises the following steps:

[0052] (1) In an environment with a dew point of -70°C and an oxygen content of 1ppm, the lithium metal is heated to 800°C, and the lithium metal is in a molten state at this time;

[0053] (2) Under the condition that the temperature is lower than the melting point of the transition metal, add the transition metal copper to the metal lithium in the molten state, keep it warm for 10 minutes, and mix well to make the metal lithium form a molten alloy state, wherein the number of atoms of copper and lithium The ratio is 2:3;

[0054] (3) cooling the metal lithium alloy in the molten state in the step (2) to room temperature within 5 minutes to prepare a lithium-copper alloy Cu2Li3 negative electrode material.

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Abstract

The invention provides a lithium alloy negative electrode material and a preparation method thereof. The preparation method comprises the following steps: heating metallic lithium to a molten state in an environment with a dew point not higher than -50°C and an oxygen content not higher than 10ppm; The metal is added to the molten lithium metal, kept warm for 5-15 minutes, and mixed to form a molten alloy state; the molten alloy is cooled to room temperature to obtain a lithium alloy negative electrode material. The preparation method of the invention is simple and feasible, and the cost is low, and the prepared metal lithium alloy negative electrode material can effectively improve the coulombic efficiency and cycle life of the battery in the lithium battery.

Description

technical field [0001] The invention belongs to the technical field of battery negative electrode materials, and in particular relates to a lithium alloy negative electrode material and a preparation method thereof. Background technique [0002] Since metal lithium has the highest theoretical specific capacity and the lowest oxidation-reduction potential, metal lithium may be used as an anode material to meet the needs of lithium batteries to increase energy density. Therefore, the research on the modification of metal lithium anode has become a hot direction in the field of lithium batteries. However, the high activity, large volume deformation, and lithium dendrites of lithium metal have always been obstacles that limit the application of lithium metal anodes. At present, the main problems of metal lithium as the negative electrode of lithium batteries are as follows: (1) The chemical activity of metal lithium is very high, and it is easy to have an irreversible chemical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/36H01M4/40H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/36H01M4/40H01M4/485H01M10/0525B82Y30/00B82Y40/00Y02E60/10C22C1/02H01M10/4207H01M4/134H01M4/1395H01M4/386H01M4/0488H01M4/382H01M4/405
Inventor 李晶泽贾维尚姚泽宇刘芋池屈思吉李超
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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