SOLID ELECTROLYTE, METHOD FOR PREPARING SAME, AND ALL-SOLID-STATE BATTERY COMPRISING SAME

It relates to a solid electrolyte and an all-solid-state battery containing it, which contains a sulfur compound represented by Chemical Formula 1 below and B in an amount of 10 ppm to 100,000 ppm. [Chemical Formula 1] LiPSClBr (In the Chemical Formula 1, 1 < x < 2, and 0 ≤ y < 1)