Preparation method of all-solid-state electrolyte battery and all-solid-state electrolyte battery

Abstract

The invention discloses a preparation method of an all-solid-state electrolyte battery. The preparation method comprises the steps of preparing a solid-state electrolyte layer, preparing positive electrode slurry, compounding a positive electrode layer and the solid-state electrolyte layer, compounding a negative electrode layer and the solid-state electrolyte layer and the like. The invention provides a simple and convenient interface modification method of an all-solid-state battery. The three-dimensional porous structures are formed on the two surfaces of the solid electrolyte, so that thepositive electrode material and the negative electrode material are in good contact with the solid electrolyte, the interface impedance between the solid electrolyte and the positive electrode and between the solid electrolyte and the negative electrode is reduced, the utilization rate of the active material is increased, and the capacity and cycle life of the all-solid-state electrolyte battery are further improved. And the method does not need to additionally dropwise add an electrolyte, does not need to additionally construct an interface modification layer and perform low-temperature sintering, and is easy to operate and good in effect. The invention also discloses an all-solid-state electrolyte battery which comprises the solid-state electrolyte base layer, and the positive electrodelayer and the negative electrode layer which are arranged on two sides of the solid-state electrolyte base layer.

Description

Technical field [0001] The invention relates to the field of solid electrolyte batteries, in particular to a preparation method of an all solid electrolyte battery and an all solid electrolyte battery. Background technique [0002] The current commercial lithium-ion batteries mainly use organic electrolytes, but organic electrolytes have safety problems such as flammability and easy leakage, which makes lithium-ion batteries have great safety risks. All-solid-state batteries that replace organic electrolytes with non-flammable solid electrolytes are considered to have higher safety and higher specific energy, and have received widespread attention. [0003] Inorganic solid electrolytes are mainly divided into two categories: oxides and sulfides. Among them, lithium lanthanum zirconate (Li 7 La 3 Zr 2 O 12 , LLZO) has high ionic conductivity (10 -4 ~10 -3 S / cm), wide electrochemical window and stability to metal lithium, it is considered to be one of the most ideal electrolytes for ...

AI Technical Summary

Problems solved by technology

Although LLZO itself has high ionic conductivity, the solid interface between LLZO and positive and negative electrode materials has always hindered the development and application of LLZO-based all-solid-state batteries.

However, the method of dropping the electrolyte reduces the safety of the battery, and the poor interface modification layer is difficult to effectively reduce the interface impedance, and low-temperature sintering is easy to cause metal ions to shuttle between the positive electrode and the solid electrolyte lattice, forming harmful impurities. And the re-sintering process brings additional energy consumption

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