Electrode, electrolyte thin layer and preparation method thereof

Abstract

The invention relates to the technical field of secondary batteries, in particular to an electrode, an electrolyte thin layer and a preparation method thereof. An electrode is prepared from a halide solid electrolyte material, the solid electrolyte material is LiaMXb, M is one or more of Al, Ga, In, Sc, Y and La series, X is one or more of F, Cl and Br, a is greater than or equal to 0 and less than or equal to 10, and b is greater than or equal to 1 and less than or equal to 13. According to the invention, the ionic conductivity, the chemical / electrochemical stability and the plasticity can beremarkably improved; and in the manufacturing process of the electrode and the electrolyte, inert atmosphere protection is not needed, the method is very compatible with a traditional electrode manufacturing technology, the process is simple, the cost is low, the large-scale production capacity is extremely achieved, and therefore the commercial application value is extremely achieved.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to an electrode, an electrolyte thin layer and a preparation method thereof. Background technique [0002] Compared with the current commercial liquid secondary batteries, all-solid-state secondary batteries have higher safety and higher energy density. This is because the all-solid-state secondary battery uses a non-flammable solid-state fast ion conductor material as the electrolyte. With the development in recent years, several ion conductivity higher than 1mS cm have been developed -1 solid electrolyte material. Especially with Li 10 Ge 2 P 2 S 12 , Li 6 P.S. 5 Cl, Li 7 P 3 S 11 and Li 3 P.S. 4 The representative sulfide solid electrolyte. However, sulfide electrolytes are extremely sensitive to air and water, and are prone to produce toxic gases such as hydrogen sulfide. Therefore, they need to be produced and operated in an environment where inert gas...

AI Technical Summary

Problems solved by technology

However, sulfide electrolytes are extremely sensitive to air and water, and are prone to produce toxic gases such as hydrogen sulfide. Therefore, they need to be produced and operated in an environment where inert gas is a protective atmosphere, which increases their production costs and limits their large-scale production and application capabilities; Secondly, the electrochemical stability window of sulfide electrolyte is narrow (1.7-2.8V), which is different from that of oxide electrode materials (such as LiCoO 2 , NMC, Graphite, etc.) will undergo interface reactions, so interface modification (surface coating of electrode materials) has become indispensable in sulfide-based all-solid-state batteries; in addition, due to the chemical instability of sulfide, it is easy to interact with polarity Solvent reaction, so the solvents and binders that can be selected in the electrode process such as slurry preparation and electrode coating are very limited

Due to the above shortcomings, the ability of large-scale production and application of sulfide-based all-solid-state batteries is very limited.

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