Solid-state electrolyte and solid-state battery containing same

Abstract

The invention discloses a solid-state electrolyte and a solid-state battery containing the same. According to the solid-state electrolyte and the solid-state battery containing the same, a novel polymer material (crown ether organic covalent skeleton structure material (COFs)) is synthesized as a modification layer to modify two sides of an inorganic solid-state electrolyte and / or an organic solid-state electrolyte in situ; and a final solid-state battery structure is a positive plate-polymer-inorganic solid electrolyte sandwich-like structure and / or an organic solid electrolyte-polymer-negative plate sandwich-like structure. The modification method provided by the invention can effectively improve the interface performance between a solid electrolyte and an electrode in situ, so that a prepared polymer solid electrolyte coating can significantly increase the transmission channel of lithium ions on a positive electrode / inorganic ceramic chip / negative electrode interface, and therefore, the transmission impedance of a solid-solid interface is reduced, the inorganic solid electrolyte and / or organic solid electrolyte are / is protected from being reduced by the metal lithium negative electrode, and the electrochemical performance of the solid-state battery is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a solid electrolyte with improved interface performance, a preparation method thereof and a solid-state battery containing the solid electrolyte. Background technique [0002] Traditional lithium-ion batteries use flammable liquid electrolytes and graphite as the negative electrode, which not only has low energy density, but also has potential safety hazards. Solid-state batteries have attracted considerable attention in next-generation energy storage devices due to their higher energy density and superior safety performance than current state-of-the-art Li-ion batteries. [0003] However, after the electrolyte is changed from liquid to solid, the lithium battery system transforms from the electrode material-electrolyte solid-liquid interface to the electrode material-solid electrolyte solid-solid interface. There is no wettability between the solid-solid interfaces, and the ...

AI Technical Summary

Problems solved by technology

Oxide solid electrolytes are represented by NASICON type (LATP, LAGP); Garnet type (LLZO, LLZTO, etc.) solid electrolytes. During the discharge process, lithium ions cannot pass through the positive electrode / electrolyte and electrolyte / negative electrode interfaces smoothly, which seriously affects the electrochemical performance of solid-state lithium batteries.

In particular, the surface of the lithium metal negative electrode and the garnet-type solid-state electrolyte is not wetted, so that there is a large interface resistance between the electrode material and the solid-state electrolyte material, and it cannot be assembled into a high-performance all-solid-state lithium-ion battery.

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