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A kind of lithium alloy strip material and preparation method thereof

A lithium alloy and strip technology, which is applied in the field of lithium alloy strip and its preparation, can solve the problems of easy adhesion of metal lithium, low Coulombic efficiency, and short life, and achieve the effects of increasing mechanical properties, reducing polarization, and low cost

Active Publication Date: 2022-03-08
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 strip material and a preparation method thereof, which can effectively solve the difficulties such as easy adhesion of metal lithium in processing, and as a negative electrode material in the battery cycle, the metal Low Coulombic efficiency and short lifetime caused by the growth of lithium dendrites

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  • A kind of lithium alloy strip material and preparation method thereof
  • A kind of lithium alloy strip material and preparation method thereof
  • A kind of lithium alloy strip material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A metal lithium alloy strip is self-supporting, and its interior includes a uniformly mixed metal lithium element and a transition metal element with a micro-nano structure, and at the same time, the metal lithium element is filled in the transition metal element with a network structure.

[0046] Its preparation method is as follows:

[0047] (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;

[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 1:100;

[0049] (3) cooling the metallic lithium alloy in molten state in step (2) to room temperature within 5min to o...

Embodiment 2

[0053] A metal lithium alloy strip is self-supporting, and its interior includes a uniformly mixed metal lithium element and a transition metal element with a micro-nano structure, and at the same time, the metal lithium element is filled in the transition metal element with a network structure.

[0054] Its preparation method is as follows:

[0055] (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;

[0056] (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;

[0057] (3) cooling the metal lithium alloy in molten state in step (2) to room temperature within 5min to obtain...

Embodiment 3

[0061] A metal lithium alloy strip is self-supporting, and its interior includes a uniformly mixed metal lithium element and a transition metal element with a micro-nano structure, and at the same time, the metal lithium element is filled in the transition metal element with a network structure.

[0062] Its preparation method is as follows:

[0063] (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;

[0064] (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;

[0065] (3) cooling the metallic lithium alloy in molten state in step (2) to room temperature within 5min to obta...

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Abstract

The invention provides a lithium alloy strip material and a preparation method thereof. The lithium alloy strip comprises uniformly mixed metallic lithium element and transition metal element of micro-nano structure; its preparation method is: (1) in an environment with a dew point not higher than -50°C and an oxygen content not higher than 10ppm, the metal Lithium is heated to molten state; (2) transition metal is added in the metal lithium of molten state, mixes, and forms the alloy state of melting; (3) is cooled to room temperature, makes lithium alloy material; (4) step (3) The obtained lithium alloy material is heated to 30-500° C.; (5) the lithium alloy is processed into an alloy strip with a thickness of 1-100 μm. The preparation method of the present invention is simple and feasible, and the cost is low. The prepared metal lithium alloy strip has higher hardness, strength and better processing performance than the lithium strip, and can effectively improve the coulombic efficiency and cycle of the battery when applied in the metal lithium battery. life.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a lithium alloy strip 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. Lithium metal as an anode material has problems such as low Coulombic efficiency, short cycle life, growth of lithium dendrites, serious side reactions between lithium metal and electrolyte, and large volume change. Since lithium ribbons can be directly used as anode materials for lithium batteries, anode materials for lithium-sulfur and lithium-air batteries, or as lithium-replenishing materials for conventional anodes such as carbon materials, etc., they are widely used, and the demand for lithium ribbons is also increasing. However, due to the char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/626H01M4/628H01M10/0525Y02E60/10
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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