Lithium metal alloy negative electrode material and preparation method and application thereof

A technology of alloy negative electrode and negative electrode material, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of expensive nano-processing methods and complex preparation processes, and achieve rapid mass production, ensure cycle performance, and low price Effect

Active Publication Date: 2019-08-13
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • 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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  • Lithium metal alloy negative electrode material and preparation method and application thereof
  • Lithium metal alloy negative electrode material and preparation method and application thereof
  • Lithium metal alloy negative electrode material and preparation method and application thereof

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. The negative electrode material comprises lithium alloy serving as a framework and metal lithium filling the framework. The lithium alloy has lithium ion conductivity, and compared with a traditional three-dimensional structure only having electron conductivity, a better three-dimensional ion and electron conductivity network can be formed, so that metal lithium is uniformly deposited, lithium dendrites cannot be generated even if charging and discharging are carried out under the condition of great current density, anda remarkable battery polarization phenomenon is not generated. The lithium alloy material which can be subjected to extraction and insertion of lithium is adopted as the structural framework, after metal lithium is used up in the circulating process, the capacity of the alloy framework can be further released, and the circulating performance of the battery is guaranteed. The used raw materials arewide in source, low in price, simple in process and 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 Applications(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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