Direct compounding method of metal lithium electrode and inorganic solid electrolyte ceramic diaphragm

An inorganic solid, ceramic separator technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve lithium dendrite short circuit and solid/solid interface instability, increase the difficulty of popularization and application, increase the difficulty of battery technology and Manufacturing cost and other issues, to achieve the effect of solving poor stability and solving large interface impedance

Active Publication Date: 2020-07-03
中国人民解放军军事科学院防化研究院
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Problems solved by technology

This method of surface atom deposition to modify the wetting layer will inevitably further increase the process difficulty and manufacturing cost of the battery, and increase the difficulty of popularization...

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  • Direct compounding method of metal lithium electrode and inorganic solid electrolyte ceramic diaphragm
  • Direct compounding method of metal lithium electrode and inorganic solid electrolyte ceramic diaphragm
  • Direct compounding method of metal lithium electrode and inorganic solid electrolyte ceramic diaphragm

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example 1

[0025] A 0.50 mol Nb-doped LLZO inorganic solid electrolyte ceramic separator (1) prepared by a self-compacting method, see (Journal of the European Ceramic Society, 38:5454-5462) for the specific preparation process. First, in the air, use 500, 1000, and 3000 mesh diamond grinding discs for grinding and polishing successively, remove the surface layer of the ceramic diaphragm 1 and make the two surfaces smooth, and obtain a ceramic diaphragm 1 with a thickness of about 1 mm and a diameter of about 1.2 cm. Diaphragm 1 looks like figure 1As shown; immediately after polishing, the ceramic diaphragm 1 was transferred to an argon-protected glove box; then, under the protection of Ar gas in the glove box, the ceramic diaphragm 1 and the molten lithium pool 3 were respectively placed on a central temperature-controlled heating platform, and Raise the temperature from room temperature to 280°C at a rate of about 10°C / min; add a metal lithium sheet at the bottom of the lithium melti...

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Abstract

The invention relates to a direct compounding method of a metal lithium electrode and an inorganic solid electrolyte ceramic diaphragm, and belongs to the field of electrochemical engineering and ceramic industry. According to the method, the surface tension of the lithium liquid is reduced by increasing the melting temperature; through a friction mode, meanwhile, an oxide layer on the surface ofthe lithium liquid and air pits formed in the micro surface of the ceramic diaphragm due to unevenness are destroyed. Fresh lithium liquid makes direct contact with the ceramic diaphragm body and theninfiltrates and spreads, and the problems that in a conventional method, the lithium liquid is difficult to infiltrate on the surface of the ceramic diaphragm, the solid/solid interface contact resistance of the metal lithium electrode and the inorganic solid electrolyte ceramic diaphragm is large, and the stability is poor are solved. According to the method, the direct compounding of the metallithium electrode and the inorganic solid electrolyte ceramic diaphragm is realized without depositing a transition infiltration layer on the surface of the ceramic diaphragm in advance in manners ofatomic deposition and the like, the process flow is simple, and the method is particularly suitable for a solid-state battery system taking metal lithium as a negative electrode and taking oxide inorganic solid electrolyte ceramic as a diaphragm.

Description

technical field [0001] The invention relates to a composite method of a metal lithium electrode and an inorganic solid electrolyte ceramic diaphragm, which belongs to the fields of electrochemical engineering and ceramic industry. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density and high specific power, and are developing rapidly and widely used. However, from small mobile phones to medium-sized electric vehicles to large-scale energy storage power stations, lithium-ion battery combustion and explosion safety accidents emerge in endlessly. Safety issues have undoubtedly become a major obstacle restricting the application of lithium-ion batteries. All-solid-state batteries use ceramic inorganic solid electrolytes to replace flammable and explosive organic electrolytes. It is considered the "ultimate" solution to battery safety issues and can fundamentally solve battery safety issues. Although it is difficult, it has become a ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/058H01M10/0525
CPCH01M10/058H01M10/0525H01M50/46H01M50/403Y02E60/10Y02P70/50
Inventor 赵鹏程张松通李萌刘梦向宇邱景义曹高萍文越华祝夏雨明海金朝庆
Owner 中国人民解放军军事科学院防化研究院
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