A kind of high ion conductivity sulfide solid electrolyte based on liquid phase method and preparation method thereof

Abstract

The invention discloses a high ion conductivity sulfide solid state electrolyte based on a liquid phase method and a preparation method thereof. The preparation method comprises the following steps: (1) comprising at least Li 2 S and P 2 S 5 Add the raw materials and solvent in the stirring container and stir, vacuum filter, and dry under reduced pressure to obtain the mixture a; (2) put the mixture a described in step (1) into a ball mill tank, vacuumize, and ball mill to obtain the mixture b; (3) Take out the mixture b described in step (2) from the glove box, and conduct heat treatment under the protection of an inert atmosphere to obtain a sulfide solid electrolyte material with high ion conductivity. The present invention eliminates the porous structure introduced by solvent and crystallization solvent molecules in the obtained sulfide solid electrolyte by decompression drying and secondary ball milling to obtain a sulfide solid electrolyte with high ion conductivity. The present invention further uses hot pressing or hot roller molding to strengthen the bonding effect of the sulfide solid electrolyte and further improve the ion conductivity.

Description

technical field

[0001] The invention relates to the technical field of solid electrolytes, in particular to a high ion conductivity sulfide solid electrolyte based on a liquid phase method and a preparation method thereof. Background technique

[0002] The ever-increasing consumption of digital electronics and the emerging electric vehicle industry have put forward higher requirements for energy storage devices. Lithium secondary batteries have many advantages such as high energy density, excellent cycle performance, no memory effect and no environmental pollution, and are favored by the market. However, lithium-ion batteries using organic electrolytes are gradually failing in the face of the market's increasingly high requirements for safety, energy density, and cycle life.

[0003] Inorganic solid electrolytes have the advantages of non-flammability, wide electrochemical stability window, and large shear modulus, and have the advantages of safety and service life that org...