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Metal lithium strip with porous solid electrolyte layer and preparation method of metal lithium strip

A technology of solid electrolyte and metal lithium, which is applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of destroying the solid electrolyte layer, physical failure, and inapplicability, so as to inhibit the growth of lithium dendrites, broaden the application range, and protect the immune system. to the damaged effect

Pending Publication Date: 2022-08-05
CHINA ENERGY LITHIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, such an artificial solid electrolyte layer has only a small number of gaps and does not have enough pores or through holes, so that a large amount of metallic lithium will accumulate in the gaps during the battery cycle, eventually destroying the solid electrolyte layer, resulting in Its physical failure; in addition, such an artificial solid electrolyte layer cannot stably conduct lithium ion flow because it does not have enough pores or through holes, so that it cannot be applied to liquid electrolyte system batteries

Method used

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  • Metal lithium strip with porous solid electrolyte layer and preparation method of metal lithium strip
  • Metal lithium strip with porous solid electrolyte layer and preparation method of metal lithium strip
  • Metal lithium strip with porous solid electrolyte layer and preparation method of metal lithium strip

Examples

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Embodiment 1

[0047] In a fume hood, polyethylene glycol was used as the organic polymer, sodium bicarbonate as the thermally decomposable inorganic salt and Li 9 N 2 Cl 3 (mix 2 moles of Li according to the chemical formula 3 N and 3 moles of LiCl were obtained by ball milling) as polyhalogen lithium metal salts. In a beaker, they were added to a tetrahydrofuran solution in a ratio of 15:35:50 by mass to obtain a solid content of 30%. gel solution, and the viscosity of the gel solution was 300 mPa·s detected by NDJ-8S digital viscometer.

[0048] Next, the gel solution obtained above was uniformly sprayed on a commercially available metal lithium tape with a thickness of 20 μm using a spray gun.

[0049] Finally, in a blast drying oven, the coated metal lithium strip was left to stand and dried, wherein the baking temperature was 45° C. and the baking time was 4 hours, thereby obtaining metal lithium with a porous solid electrolyte layer. bring.

[0050] figure 1 A schematic diagram ...

Embodiment 2

[0055]Except that polyvinyl alcohol was used instead of polyethylene glycol, other steps were the same as in Example 1 to obtain a metal lithium ribbon with a porous solid electrolyte layer. After testing, its microscopic morphology and pore structure are basically the same as those in Example 1.

Embodiment 3

[0057] Except for using guar gum instead of polyethylene glycol, other steps are the same as in Example 1 to obtain a metal lithium ribbon with a porous solid electrolyte layer. After testing, its microscopic morphology and pore structure are basically the same as those in Example 1.

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Abstract

The invention provides a metal lithium strip used as a battery negative electrode and a preparation method thereof, the metal lithium strip is provided with a porous solid electrolyte layer on at least one surface of the metal lithium strip, and the porous solid electrolyte layer is formed by an organic polymer with a specific melting range and a specific inorganic salt in a mass ratio of (5-35): (65-95). The metal lithium strip disclosed by the invention not only can be applied to an all-solid electrolyte battery system, but also can be applied to a liquid or semi-solid electrolyte battery system; in an all-solid-state battery system, the porous solid-state electrolyte layer can be directly used as a solid-state electrolyte layer and can also be used as a transition layer between the metal lithium strip and the solid-state electrolyte; and in a liquid or semi-solid electrolyte battery system, the pore structure of the porous solid electrolyte layer can homogenize the lithium ion flow so as to play a role in inhibiting the growth of lithium dendrites. In addition, due to the existence of the porous solid electrolyte layer, the reaction between the lithium strip and moisture and nitrogen in the atmosphere can be effectively slowed down.

Description

technical field [0001] The invention belongs to the field of lithium strip processing, and in particular relates to a metal lithium strip with a porous solid electrolyte layer used as a negative electrode of a battery and a preparation method thereof. Background technique [0002] The lithium metal anode has a lower density (0.534 g / cm 3 ), the highest theoretical capacity (3860mAh / g) and the lowest electrochemical potential (-3.04V, relative to the standard hydrogen electrode), has been a research hotspot, and has been a research hotspot for the manufacture of next-generation high-energy density (>300Wh / kg) Secondary batteries offer the possibility. However, when used as a negative electrode in a battery system, a large number of lithium dendrites will be generated on the surface of the metal lithium negative electrode due to the uneven deposition of lithium ions on the metal lithium negative electrode during the cycling process. The existence of lithium dendrites will...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/134H01M4/1395H01M10/056
CPCH01M4/628H01M4/624H01M4/134H01M4/1395H01M10/056H01M2004/021H01M2004/027H01M2300/0065H01M2300/0091Y02P70/50
Inventor 孔德钰陈强牟瀚波郇庆娜孙兆勇
Owner CHINA ENERGY LITHIUM
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