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A lithium alloy strip and a preparation method thereof

A lithium alloy and strip technology, applied in the field of lithium alloy strip and its preparation, can solve the problems of easy adhesion of metal lithium, low coulombic efficiency, short life, etc., and achieve good affinity, improved coulombic efficiency, and low cost Effect

Active Publication Date: 2019-01-18
UNIV OF ELECTRONIC 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 lithium alloy strip and a preparation method thereof
  • A lithium alloy strip and a preparation method thereof
  • A lithium alloy strip and a preparation method thereof

Examples

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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 and a preparation method thereof. The lithium alloy strip comprises a uniformly mixed metal lithium elemental substance and a transition metal elemental substance of micro-nano structure; The preparation method comprises the following steps: (1) Heating the metal lithium to a molten state in an environment having the dew point not higher than -50 DEG CAND having an oxygen content of not more than 10 ppm; (2) adding the transition metal into the molten metal lithium, and uniformly mixing to form a molten alloy state; 3) cooling to room temperatureto obtain lithium alloy material; 4) heating that lithium alloy material obtained in the step 3) to 30-500 DEG C; (5) processing the lithium alloy into an alloy strip with a thickness of 1 to 100 [mu]m. The preparation method is simple and feasible, the cost is low, and the prepared metal lithium alloy strip has higher hardness, strength and better processing performance than the lithium strip, and can be applied in a metal lithium battery to effectively improve the coulomb efficiency and cycle life of the battery.

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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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 ELECTRONIC SCI & TECH OF CHINA
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