A sulfide all-solid-state battery based on strong pre-lithiation and a preparation method thereof

Abstract

The application discloses a sulfide full solid-state battery based on strong pre-lithiation and a preparation method thereof. The method comprises the following steps: uniformly mixing micron-sized SiO material, a lithium source and LiCl by ball milling, and then performing sintering treatment in an inert atmosphere to obtain pre-lithiated SiO material; mixing and contacting graphite material with an organic lithiation reagent for 30 seconds to 30 minutes, and then performing centrifugal washing treatment to obtain pre-lithiated graphite material; uniformly mixing the pre-lithiated SiO material, the pre-lithiated graphite material and sulfide electrolyte LPSC to obtain a composite negative electrode material; uniformly mixing NCM811 positive electrode material and the sulfide electrolyte LPSC to obtain a composite positive electrode material; pressing the sulfide electrolyte LPSC into a sheet to obtain a solid electrolyte layer; uniformly spreading the composite negative electrode material and the composite positive electrode material on two sides of the solid electrolyte layer respectively, and then performing pressing and forming to obtain the sulfide full solid-state battery. The sulfide full solid-state battery prepared by the application has high initial efficiency and strong cycle life.

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