Previous studies on insertion of lithium into rhombohedral forms of Fe2(S04)3 and Li3Fe2(P04)3 have determined the position of the Fe3/Fe2 redox couple to be at 3.6 and 2.8 eV, respectively, below the Fermi level of lithium. Lithium insertion into rhombohedral LiFe2(S04)2(P04) with NASICON framework exposes the Fe37Fe2 redox couple at 3.3-3.4 eV below the Fermi energy of lithium. Unlike Fe2(S04)3, the insertion of lithium into the structure of LiFe2(S04)2(P04) is accomplished as a single-phase solid solution, which makes it attractive as an electrode material for rechargeable lithium batteries.

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