SOLID ELECTROLYTE, METHOD OF PREPARING THE SAME, AND ELECTROCHEMICAL DEVICE INCLUDING THE SAME

A solid electrolyte including a compound represented by Formula 1 or 3, the compound having a glass transition temperature of −30° C. or less, and a glass or glass-ceramic structure, AQX-GaM(FCl)Z Formula 1 wherein, in Formula 1, AQX-aMZ-bGa(FCl) Formula 3