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Laminated lithium metal battery negative electrode material, preparation method thereof and lithium metal secondary battery

A technology for lithium metal batteries and negative electrode materials, which is applied in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of difficult thickness control, insufficient SEI stability, complex modification layer process, etc., and achieves high industrial application prospects that are not easy to fall off , to promote the effect of uniform deposition

Inactive Publication Date: 2021-05-04
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a laminated lithium metal battery negative electrode material and its preparation method, and lithium metal secondary battery

Method used

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  • Laminated lithium metal battery negative electrode material, preparation method thereof and lithium metal secondary battery
  • Laminated lithium metal battery negative electrode material, preparation method thereof and lithium metal secondary battery
  • Laminated lithium metal battery negative electrode material, preparation method thereof and lithium metal secondary battery

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preparation example Construction

[0027] Its preparation method mainly comprises the following steps:

[0028] 1) Metal lithium or lithium-free negative electrode current collectors are prepared by physical vapor deposition or chemical vapor deposition methods to prepare lithium-friendly metal layers;

[0029] Specifically, the lithium metal includes: any one of lithium sheet, lithium strip, lithium foil, lithium block or lithium wire.

[0030] Specifically, the lithium-free negative electrode current collector includes: at least one of copper foil, nickel foil, stainless steel foil, iron foil, carbon cloth, carbon paper, graphene film, carbon nanotube film or carbon fiber film.

[0031] Specifically, the lithium-friendly metal layer is at least one of silicon, magnesium, copper, silver, beryllium, zinc, aluminum, gold or boron; the thickness of the artificial lithium ion diffusion layer is 5nm-5μm.

[0032] 2) preparing an artificial lithium ion diffusion layer on the surface of the lithium-friendly metal la...

Embodiment 1

[0036] A copper foil with a thickness of 12 μm was selected as the substrate, and a metal silver layer with a thickness of 100 nm was deposited on its surface as a lithium-friendly metal layer by DC magnetron sputtering. Then, a LiPON layer with a thickness of 500 nm was deposited on the surface of the metal silver layer by radio frequency magnetron sputtering as an artificial lithium ion diffusion layer to obtain a negative electrode of a laminated lithium metal battery.

[0037] The laminated electrode punched sheet obtained above, Celgard2400 diaphragm, lithium sheet, lithium ion electrolyte, the composition is 1MLiTFSI 1,3-dioxolane DOL / ethylene glycol dimethyl ether DME, assembled into a button battery. Test using 0.5mA / cm 2 current density, surface capacity of 0.5mAh / cm 2 .

[0038] see results figure 2 , the cycle efficiency of the stacked lithium metal battery negative electrode is stable at more than 90% within 100 cycles, while the coulombic efficiency of the pur...

Embodiment 2

[0042] A metal lithium sheet with a thickness of 400 μm was selected as a substrate, and a metal silver layer with a thickness of 100 nm was deposited on its surface by DC magnetron sputtering as a lithium-friendly metal layer. Then, a LiPON layer with a thickness of 500 nm was deposited on the surface of the metal silver layer by radio frequency magnetron sputtering as an artificial lithium ion diffusion layer to obtain a negative electrode of a laminated lithium metal battery.

[0043]The laminated electrode obtained above, Celgard2400 diaphragm, lithium sheet, lithium ion electrolyte, the composition is 1MLiTFSI 1,3-dioxolane DOL / ethylene glycol dimethyl ether DME, assembled into a button battery. Tested using 5mA / cm 2 current density, surface capacity of 5mAh / cm 2 .

[0044] see results image 3 , the pure metal lithium negative electrode only cycles for nearly 100 hours, while the stacked metal lithium negative electrode of lithium phosphorus oxygen nitrogen / silver / lit...

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Abstract

The invention provides a laminated lithium metal battery negative electrode material, a preparation method thereof and a lithium metal secondary battery. The preparation method is characterized in that: a lithium-philic metal layer capable of being alloyed with lithium is prepared on the surface of a metal lithium negative electrode or a lithium-free negative electrode current collector, and an artificial lithium ion diffusion layer is prepared on the surface of the lithium-philic metal layer, wherein the lithium-philic metal layer has the functions of reducing nucleation and diffusion barriers of lithium and accelerating electrochemical kinetics of an electrode interface; and the artificial lithium ion diffusion layer has the functions of stabilizing the metal lithium surface and adjusting lithium ion diffusion. A multi-stage functional modification layer of the laminated lithium metal battery negative electrode can inhibit the generation of lithium dendrites, and the cycling stability of the metal lithium negative electrode is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a laminated lithium metal battery negative electrode material, a preparation method thereof, and a lithium metal secondary battery. Background technique [0002] With the development and progress of science and technology, in order to meet the energy needs of various fields such as electric vehicles, consumer electronics and grid energy storage, it is necessary to develop secondary batteries with higher energy density. Among various types of secondary batteries, lithium metal secondary battery systems have the most impressive energy density due to their high specific capacity and low redox potential. However, metal lithium has the characteristics of uneven deposition. During charging and discharging, it is easy to form dendrites at the reaction interface and pierce the separator to cause a short circuit of the battery. Electrochemical behavior: Due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M10/0525
CPCH01M4/0423H01M4/0426H01M4/0428H01M4/134H01M4/1395H01M10/0525Y02E60/10
Inventor 夏赫一岳昕阳王冬磊傅正文
Owner FUDAN UNIV
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