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Abstract reversible transfer of 1.2 Li+ per formula unit, resulting in an outstanding specific capacity. Besides, they offer other advantages such as reasonable working voltage (1.2–3 V) and 3-dimensional (3D) Li+ diffusion with a low diffusion barrier (0.32 eV). Despite that the moderate working voltage limits the energy density to some extent; it enables the usage of various alternative electrolytes which cannot be used at high voltages due to their instabilities [44]. These materials have structure resembles that of crystalline Li3OCl superionic conductors. In the Antiperovskites structure type, cations and anions have switched atomic sites as compared to the classic perovskite CaTiO3. (Li2TM) ChO compounds (TM = Fe, Mn, Co; Ch = S and Se) are cubic anti-perovskites, described by the space group 𝑃𝑚3 𝑚. Accordingly, the (Li / TM) atoms are located at the octahedral vertices, S2−or Se2− at the cube vertices, and O at the cube centers. The cation site in the antiperovskite structure is randomly occupied by lithium, iron and cobalt or manganese [43, 45, 46]. The solid state reaction method is the most common method for synthesizing these materials [43, 44, 46- 49]. Recently [50] succeed to synthesis (Li2Fe)SO by mechanochemical ball milling method. |