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Lithium-philic alloy modification layer, composite lithium negative electrode material, and preparation method and application of material

A negative electrode material, lithium alloy technology, applied in nanotechnology for materials and surface science, negative electrodes, battery electrodes, etc., can solve the problems of electrode volume expansion, complex preparation methods, lithium dendrite growth, etc., to achieve extended cycle Effects of longevity, rate performance improvement, and high affinity

Active Publication Date: 2021-06-15
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

[0005] In view of the above-mentioned deficiencies or defects, the object of the present invention is to provide a lithium-philic alloy modification layer, a composite lithium negative electrode material and its preparation method and application, which can effectively solve the problems of lithium dendrite growth, Electrode volume expansion and structure pulverization as well as complex and costly preparation methods

Method used

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  • Lithium-philic alloy modification layer, composite lithium negative electrode material, and preparation method and application of material
  • Lithium-philic alloy modification layer, composite lithium negative electrode material, and preparation method and application of material
  • Lithium-philic alloy modification layer, composite lithium negative electrode material, and preparation method and application of material

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Embodiment 1

[0034] This embodiment 1 provides a lithium-philic alloy modification layer, a composite lithium negative electrode material and a preparation method thereof, specifically comprising the following steps:

[0035] In an external environment with a dew point of -50°C and an oxygen content of less than 10ppm, metal lithium is placed in a stainless steel crucible and placed on a heating platform with a temperature of 400°C to make the metal lithium into a molten state; then metal magnesium ( Mg) is added to molten metal lithium to form a molten lithium alloy; finally, the obtained molten lithium alloy is contacted with the surface of the foamed copper cavity structure, and it is cooled to room temperature within 2 minutes to obtain a metal-containing material. A three-layer structure of Cu skeleton layer, Mg-Cu lithium-philic alloy modification layer and Li-Mg lithium alloy / metal lithium layer, a solid composite lithium anode material containing at least three components, and a sch...

Embodiment 2

[0037] This embodiment 2 provides a lithium-philic alloy modification layer, a composite lithium negative electrode material and a preparation method thereof. The difference from embodiment 1 is only that the foamed copper cavity structure material in embodiment 1 is replaced with copper foil, and the remaining parameters are the same.

Embodiment 3

[0039]This embodiment 3 provides a lithium-philic alloy modification layer, a composite lithium negative electrode material and a preparation method thereof. The difference from the embodiment 1 is only that the foamed copper cavity structure material in the embodiment 1 is replaced by a copper wire network, and the rest The parameters are all the same.

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Abstract

The invention discloses a lithium-philic alloy modification layer, a composite lithium negative electrode material, and a preparation method and application of the material, and belongs to but is not limited to the technical field of batteries. A dissimilar element M is added into molten metal lithium to obtain a molten lithium alloy Li-M, the molten lithium alloy Li-M is in contact with the surface of a metal material N, the lithium-philic alloy modification layer at least containing elements M and N is spontaneously formed on the surface of the metal material N, the lithium-philic alloy modification layer induces a liquid lithium alloy and / or liquid lithium to be adsorbed on the surface of the metal material N, and then the liquid lithium alloy and / or the liquid lithium are cooled to room temperature to obtain the solid-state composite lithium negative electrode material which has a three-layer structure containing a metal material N framework layer, the lithium-loving alloy modification layer and a Li-M lithium alloy / metal lithium layer and comprises at least three components. The preparation problem of an existing composite lithium negative electrode material and the problems of lithium dendrite growth, electrode volume expansion and structure pulverization in the circulation process are solved.

Description

technical field [0001] The invention belongs to but not limited to the field of battery technology, and specifically relates to a lithium-philic alloy modification layer, a composite lithium negative electrode material, and a preparation method and application thereof. Background technique [0002] The negative electrode material of the battery is one of the main factors affecting its energy density. The negative electrodes of commercial lithium-ion batteries are mostly based on carbonaceous materials. Due to the limited graphitization structure, the theoretical specific capacity of carbonaceous materials is only 372mAh / g, which is one of the main factors restricting the further improvement of energy density of lithium-ion batteries. The theoretical specific capacity of pure lithium anode material can reach 3860mAh / g, and it has ultra-low electrochemical potential (-3.040V vs. standard hydrogen electrode) and ultra-low mass density (0.53g / cm 3 ), is an ideal anode material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/134H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/382H01M4/626H01M4/628H01M4/134H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 李晶泽阮瑾陈涛王子豪王志红
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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