Lithium composite negative electrode material with three-dimensional skeleton structure and reserved space on surface and preparation method of lithium composite negative electrode material

A technology for negative electrode materials and reserved space, applied in the field of lithium composite negative electrode materials and its preparation, to achieve stable structure, inhibit the formation of lithium dendrites, and simple preparation methods

Active Publication Date: 2021-12-31
YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reserved space is used to accommodate the deposition of lithium metal and keep the volume of the negative electrode stable, while the role of the three-dimensional framework is to limit the growth of lithium metal within the framework and regulate the deposition behavior of lithium metal, thereby inhibiting the formation of lithium dendrites and greatly improving It improves the cycle life of lithium metal batteries and effectively solves the problem of uncontrolled growth of metal lithium in existing lithium composite negative electrode materials to form lithium dendrites.

Method used

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  • Lithium composite negative electrode material with three-dimensional skeleton structure and reserved space on surface and preparation method of lithium composite negative electrode material
  • Lithium composite negative electrode material with three-dimensional skeleton structure and reserved space on surface and preparation method of lithium composite negative electrode material
  • Lithium composite negative electrode material with three-dimensional skeleton structure and reserved space on surface and preparation method of lithium composite negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The precursor material zinc fluoride powder (size less than 1mm) is hot-filled with metal lithium to form a lithium-rich lithium-zinc alloy composite electrode material with lithium fluoride particle arrays and reserved spaces on the surface. The specific process is: put lithium metal on stainless steel foil, heat up to 300°C in an argon atmosphere until the lithium metal is completely melted; then add zinc fluoride with a molar ratio of 1:50 to lithium metal into the molten metal Stirring in lithium for 1 hour, mixing molten metal and powder evenly, cooling to room temperature, obtaining a lithium-rich lithium-zinc alloy composite electrode material with lithium fluoride particle arrays and reserved spaces on the surface.

[0031] The scanning electron microscope (SEM) photograph of the lithium composite electrode material that this example makes is as follows figure 2 shown; among them figure 2 a is the SEM photo of the obtained lithium composite electrode material...

Embodiment 2

[0033] The precursor material aluminum fluoride powder (size less than 1mm) is hot-filled with metal lithium to form a lithium-rich lithium-aluminum alloy composite electrode material with a lithium fluoride particle array and reserved space on the surface. The specific process is: put metal lithium on stainless steel foil, heat up to 350°C in an argon atmosphere until the metal lithium is completely melted; then add aluminum fluoride with a molar ratio of 1:100 to metal lithium into the molten metal Stirring in lithium for 0.5 hours, mixing molten metal and powder evenly, cooling to room temperature, obtaining a lithium-rich lithium-aluminum alloy composite electrode material with lithium fluoride particle arrays and reserved spaces on the surface.

Embodiment 3

[0035] The precursor material copper fluoride powder (size less than 1mm) is hot-filled with metal lithium to form a lithium-rich lithium-copper alloy composite electrode material with lithium fluoride particle arrays and reserved spaces on the surface. The specific process is: put lithium metal on stainless steel foil, heat up to 450°C in an argon atmosphere until the lithium metal is completely melted; then add copper fluoride with a molar ratio of 1:200 to lithium metal into the molten metal Stirring in lithium for 2 hours, mixing molten metal and powder evenly, cooling to room temperature, obtaining a lithium-rich lithium-copper alloy composite electrode material with lithium fluoride particle arrays and reserved spaces on the surface.

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Abstract

The invention discloses a lithium composite negative electrode material with a three-dimensional skeleton structure and a reserved space on the surface and a preparation method of the lithium composite negative electrode material, and belongs to the technical field of chemical power sources. Molten metal lithium and fluoride and / or oxide and / or sulfide are subjected to a chemical reaction to be compounded, and the lithium composite negative electrode material with the surface provided with a three-dimensional framework structure formed by lithium fluoride and / or lithium oxide and / or lithium sulfide micro-nano materials and a reserved space is obtained. The reserved space is used for accommodating the deposition of metal lithium and keeping the volume of the negative electrode stable, and the three-dimensional framework is used for limiting the growth of the metal lithium in the framework and regulating and controlling the deposition behavior of the metal lithium, so that the formation of lithium dendrites is inhibited, and the cycle life of the lithium metal battery is greatly prolonged; the problem that lithium dendrites are formed due to the fact that metal lithium in an existing lithium composite negative electrode material is not controlled to grow is solved. Meanwhile, the electrochemical performance of the lithium composite negative electrode material is remarkably improved, and the lithium composite negative electrode material is easy to prepare and convenient for large-scale mass production and application.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a lithium composite negative electrode material with a three-dimensional skeleton structure and reserved space on the surface and a preparation method thereof. Background technique [0002] Lithium-ion batteries (LIBs) have been unable to meet the growing demand for energy storage with high energy density. Lithium metal has a high theoretical specific capacity (3860mAh g -1 ) and the lowest electrochemical potential (-3.04V relative to the standard hydrogen electrode), it is considered to be the best choice for the anode material of the next generation lithium secondary battery. However, the uncontrollable dendrite growth and "infinite" volume change of lithium metal anodes during cycling hinder their practical application. [0003] In order to solve the current problems of lithium metal anodes, the researchers proposed to fill metal lithium into a three-dimensio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/366H01M10/0525Y02E60/10
Inventor 李晶泽王子豪周爱军
Owner YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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