Lithium alloy anode 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 its preparation, can solve the problems of low Coulombic efficiency and short life, and achieve the effects of improving Coulombic efficiency, low cost and improving cycle life.

Active Publication Date: 2019-02-12
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 so

Method used

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  • Lithium alloy anode material and preparation method thereof
  • Lithium alloy anode material and preparation method thereof
  • Lithium alloy anode material and preparation method thereof

Examples

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Effect test

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 anode material and a preparation method thereof. The preparation method comprises the following steps: in an environment that the dew point is not higher than 50DEG C below zero and the oxygen content is not higher than 10 ppm, heating the lithium metal to a melting state; adding transition metal into the molten lithium metal, performing heat preservation for 5 minutes to 15 minutes, and uniformly mixing to form a molten alloy state; cooling the molten state alloy to room temperature to obtain the lithium alloy anode material. The preparation method disclosed by the invention has the advantages of simplicity, feasibility and low cost; when being applied to a lithium battery, the prepared lithium metal alloy anode material can effectively improve thecoulomb efficiency of the battery and prolong cycle life of the 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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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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