All-solid-state battery electrode and preparation method and application thereof

Abstract

The invention relates to an all-solid-state battery electrode and a preparation method and application thereof. The method comprises the following steps: (1) providing a basic electrode, the basic electrode comprising a current collector and an electrode material layer coating the surface of the current collector, and the electrode material layer comprising an active material; (2) mixing a first solid electrolyte, a second solid electrolyte and a solvent to obtain a composite electrolyte turbid liquid, coating the surface of a base electrode with the turbid liquid, and removing the solvent toobtain the electrode; wherein the first solid electrolyte is a sulfide type solid electrolyte and is dissolved in a solvent, and the second solid electrolyte is an inorganic solid electrolyte and is insoluble in the solvent. According to the method, an in-situ filling process is adopted, gaps of the active material are filled with the first solid electrolyte, meanwhile, the solid electrolyte layeris combined with the electrode material layer, interface contact between the active material and the solid electrolyte layer is improved, the production process is simple, and the method is suitablefor large-scale application.

Description

technical field [0001] The invention relates to the field of all-solid-state batteries, in particular to an all-solid-state battery electrode and its preparation method and application. Background technique [0002] Lithium batteries have the advantages of high energy density, long cycle life, high safety, small self-discharge, wide operating temperature range, no memory effect, and environmental friendliness. They have been used in electric vehicles, rail transit, and aerospace and other fields. However, commercialized lithium-ion batteries use organic liquid electrolytes, which are prone to side reactions with electrode materials, resulting in irreversible capacity decay, and at the same time, phenomena such as volatilization, drying up, and leakage; on the other hand, traditional lithium batteries cannot be used Lithium metal is used as the negative electrode material. Because lithium metal is repeatedly dissolved and deposited during the battery cycle, it is easy to form...

AI Technical Summary

Problems solved by technology

However, the electrodes of the solid-state battery are pressed together with the solid-state electrolyte when the battery is assembled, and there is a problem of poor contact between the electrode and the solid-state electrolyte, resulting in a large internal resistance of the battery.

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