High-temperature-resistant metal lithium negative electrode as well as preparation method and application thereof

A lithium metal, high temperature resistant technology, applied in negative electrodes, lithium batteries, battery electrodes, etc., can solve problems such as battery structure damage, battery safety accidents, metal lithium negative electrode melting, etc., and achieve the effect of avoiding leakage

Active Publication Date: 2021-07-30
CHINA ENERGY LITHIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, lithium metal itself has a low melting point of 180°C. During the use of the battery, especially under harsh conditions such as overcharging, battery device failure, or external high temperature, the temperature of the battery can easily reach 180°C, causing the lithium metal negative electrode to melt. , which in turn leads to the destruction of the entire battery structure, causing battery safety accidents

Method used

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  • High-temperature-resistant metal lithium negative electrode as well as preparation method and application thereof
  • High-temperature-resistant metal lithium negative electrode as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Preparation of high temperature resistant metal lithium anode

[0055] The polyimide was melted, and a supporting framework 1 with a thickness of 10 microns was prepared by electrospinning. The prepared supporting frame 1 is placed between two layers of metal lithium foils with a thickness of 20 microns, and at the same time, the tab 5 is placed in a suitable position between the lithium foil and the supporting frame and rolled together to obtain a metal lithium core. Adjust the electrospinning process to prepare a porous polyimide protective layer 3 on the surface of the lithium metal core. After the porous protective layer 3 is dried, it is immersed in the slurry of the sulfide solid electrolyte (except the tabs), and dried to obtain a high-temperature-resistant lithium metal negative electrode.

Embodiment 2

[0057] Preparation of high temperature resistant metal lithium anode

[0058] Polytetrafluoroethylene was melted, and a support framework 1 with a thickness of 5 microns was prepared by electrospinning. The prepared support frame 1 is placed between two layers of metal lithium foil with a thickness of 10 microns, and at the same time, the tab 5 is placed at a suitable position outside the lithium foil and rolled together to obtain a metal lithium core with tabs . Adjusting the vapor deposition process, depositing a layer of porous copper plating with a thickness of 10 nm on the surface of the lithium metal core to obtain the porous protective layer 3 . Submerge the above-mentioned pole piece in the slurry of the sulfide solid electrolyte (except the tab), and dry to obtain a high-temperature-resistant lithium metal negative electrode.

Embodiment 3

[0060] Preparation of high temperature resistant metal lithium anode

[0061] Polytetrafluoroethylene was melted, and a support framework 1 with a thickness of 15 microns was prepared by electrospinning. The prepared support frame 1 is placed between two layers of metal lithium foils with a thickness of 20 microns, and at the same time, the tab 5 is placed at a suitable position outside the lithium foil and rolled together to obtain a metal lithium core with tabs . Adjust the electrospinning process to prepare a porous protective layer of tetrafluoroethylene on the surface of the lithium metal core 3 . After the porous protective layer 3 is dried, the slurry of the sulfide solid electrolyte is coated on the porous protective layer (except the tabs) and dried. The side of the pole piece is sealed with molten polytetrafluoroethylene, and dried to obtain a high-temperature-resistant metal lithium negative electrode.

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Abstract

The invention discloses a high-temperature-resistant metal lithium negative electrode as well as a preparation method and application thereof. The high-temperature-resistant metal lithium negative electrode comprises a metal lithium core, a tab in contact with the metal lithium core; a packaging layer used for packaging the metal lithium core, the packaging layer comprising a porous protection layer and an external packaging layer, wherein the porous protection layer is made of a high-temperature-resistant material and is used for packaging all structures, except a tab contact part, of the metal lithium core; and the external packaging layer is a solid electrolyte layer and is formed on the surface, opposite to the main surface of the metal lithium core, of the porous protection layer, or is formed on the whole outer surface of the porous protection layer. The high-temperature-resistant metal lithium negative electrode solves the problem of melting failure of a conventional metal lithium negative electrode at a high temperature, and by using the metal lithium negative electrode disclosed by the invention, even in a working environment exceeding a melting point of metal lithium, the high-temperature-resistant metal lithium negative electrode can still execute functions of the negative electrode without damaging a battery structure and causing failure of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a metal lithium negative electrode that can be used in primary lithium batteries and secondary lithium batteries, and a preparation method and application thereof. Background technique [0002] Lithium batteries are widely used in aerospace, computers, mobile communication equipment, robots and electric vehicles due to their advantages of high energy density, long cycle life and wide temperature range. Lithium metal can be used as the negative electrode of advanced high-energy density batteries, such as lithium-sulfur batteries / all-solid-state batteries / lithium-air batteries, etc. The single energy density of these batteries is higher than that of the current mature lithium-ion batteries, so it is also a battery form that needs to be vigorously developed in the future. [0003] However, lithium metal itself has a low melting point of 180°C. During battery use, especial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/052H01M10/0525H01M12/06H01M4/12H01M6/00
CPCH01M4/134H01M4/1395H01M10/052H01M10/0525H01M12/06H01M4/12H01M6/00H01M2004/027Y02E60/10
Inventor 孔德钰郇庆娜孙兆勇刘承浩陈强牟瀚波
Owner CHINA ENERGY LITHIUM
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