Solid electrolyte, preparation method and solid-state battery

The embodiment of the invention provides a solid-state electrolyte, a preparation method and a solid-state battery, and relates to the field of solid-state electrolytes. The solid electrolyte comprises an electrolyte sheet and an interface layer attached to the surface of the electrolyte sheet, the electrolyte sheet comprises a lithium-rich anti-perovskite material Li2OH XaFb, X comprises at least one of Cl and Br, a + b = 1, and the interface layer comprises graphite. According to the solid-state electrolyte, the preparation method and the solid-state battery provided by the embodiment of the invention, interface modification of the anti-perovskite electrolyte is realized, lithium can be uniformly deposited, and the cycle performance of the battery is improved. 本申请实施例提供一种固态电解质及制备方法与固态电池，涉及固态电解质领域。固态电解质包括电解质片和附着于电解质片表面的界面层，电解质片包括富锂反钙钛矿材料Li2OHXaFb，X包括Cl、Br中的至少一种，a+b＝1，界面层包括石墨。本申请实施例的固态电解质及制备方法与固态电池实现对反钙钛矿电解质的界面改性，能够使锂均匀沉积，提高电池的循环性能。