A kind of lithium metal alloy negative electrode material and its preparation method and application

A technology of alloy negative electrode and negative electrode material, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of complex preparation process and expensive nano-processing method, and achieve the effect of ensuring cycle performance, rapid mass production, and low price

Active Publication Date: 2022-02-18
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In addition, this type of method usually requires complex preparation processes and expensive nanofabrication methods to achieve electrode preparation, and needs to be combined with metal lithium filling or encapsulation into a three-dimensional structure process, which poses a huge challenge to industrial production under current technical conditions.

Method used

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  • A kind of lithium metal alloy negative electrode material and its preparation method and application
  • A kind of lithium metal alloy negative electrode material and its preparation method and application
  • A kind of lithium metal alloy negative electrode material and its preparation method and application

Examples

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Embodiment 1

[0056] This example is used to illustrate the preparation process of the metal lithium alloy negative electrode of the present invention.

[0057] (1) Weigh 0.7g metal lithium sheet and 0.28g monocrystalline silicon sheet, and place them in a container that does not react with lithium and silicon in a glove box filled with argon;

[0058] (2) Heating the container to 200°C, the metal lithium is completely melted, and contacts with silicon for an alloying reaction; stir the liquid alloy for 30 minutes to make it evenly mixed;

[0059] (3) Coating the mixture onto an iron foil current collector with a thickness of 100 μm; cooling down to room temperature at a rate of 80°C / s to obtain lithium metal and lithium-silicon alloy (Li 58 +Li 22 Si 5 ) negative pole, denoted as A1.

Embodiment 2

[0061] The negative electrode is prepared in the same manner as in Example 1, except that, in step (1), 0.28g of nano-silicon powder is used to replace 0.28g of single-crystal silicon sheet to obtain lithium metal and lithium-silicon alloy (Li 58 +Li 22 Si 5 ) negative pole, denoted as A2.

Embodiment 3

[0063] The negative electrode is prepared in the same manner as in Example 1, the difference is that in step (1), 1.12g of tin powder is used to replace 0.28g of a single crystal silicon chip to obtain a metal lithium and lithium-tin alloy (Li 58 +Li 17 sn 4 ) negative pole, denoted as A3.

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Abstract

The invention provides a lithium metal alloy negative electrode material, which includes a lithium alloy as a skeleton and metal lithium filled in the skeleton. Lithium alloy has lithium ion conductivity. Compared with the traditional three-dimensional structure with only electronic conductivity, it can form a better three-dimensional ion and electronic conductivity network, so that metal lithium can be deposited evenly, even if it is charged and discharged at a very high current density. Lithium dendrites will be generated without significant battery polarization. The invention adopts the lithium alloy material capable of deintercalating lithium as the structural skeleton, and after the metallic lithium is exhausted during the cycle, the alloy skeleton can further release capacity to ensure the cycle performance of the battery. The raw materials used in the invention have wide sources, low price, simple process and are suitable for rapid large-scale production.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a lithium metal alloy negative electrode material and a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of mobile electronic devices, power vehicles and smart grids, higher requirements have been placed on the energy density of batteries. Graphite anode-based lithium-ion batteries have experienced nearly 30 years of development. The capacity of graphite anodes has approached the theoretical capacity limit of 372mAh / g, and the energy density of graphite-based batteries has gradually approached the limit. In order to meet the rapid increase in the urgent demand for battery energy density, it is necessary to develop anode materials with higher energy density. In recent years, it has become an important research direction in the battery field to use metal lithium anodes with hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/40H01M10/0525H01M4/134H01M4/1395
CPCH01M4/364H01M4/405H01M4/382H01M4/134H01M4/1395H01M10/0525Y02E60/10
Inventor 张华俞海龙黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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