Solid ion conductor, solid electrolyte including the same, electrochemical device including the same, and preparation method thereof

A method of preparing a solid ion conductor, the method comprising:

• providing a precursor mixture comprising a precursor for forming the solid ion conductor;
• and
• heat-treating the precursor mixture under an oxidative atmosphere to provide the solid ion conductor comprising a garnet-type oxide represented by Formula 1:
• LiAM1BLaCM2DZrEM3FM4GOHXI Formula 1
• wherein, in Formula 1,
• M1 is a monovalent cation, a divalent cation, a trivalent cation, or a combination thereof,
• M2 is a monovalent cation, a divalent cation, a trivalent cation, or a combination thereof,
• M3 is a divalent cation, a trivalent cation, a tetravalent cation, a pentavalent cation, a hexavalent cation, or a combination thereof,
• M4 is Ir, Ru, Mn, or a combination thereof,
• X is a monovalent anion, a divalent anion, a trivalent anion, or a combination thereof, and
• 6≤A≤8, 0≤B<2, 2.8≤C≤3, 0≤D≤0.2, 0<E<2.0, 0<F<2.0, 0<G≤0.2, 9≤H≤12, and 0≤I≤2 are satisfied.