Poster session PA
Lithium insertion into Fe2(SO4)3 frameworks

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Abstract

The two polymorphs of Fe2(SO4)3 consist of framework structures built up of tetrahedra sharing corners with octahedra and vice versa. One is rhombohedral, the other is monoclinic. Two moles of lithium insert rapidly into both structures at room temperature. However, lithium insertion into the rhombohedral phase is topotactic without any change of symmetry of the framework, whereas the monoclinic modification is converted to an orthorombic Li2Fe2(SO4)3 phase via a displacement transition; the existence of a two-phase region between Fe2(SO4)3 and Li2Fe2(SO4)3 results in a flat OCV of 3.6 V versus lithium, which is 600 mV higher than is found for LixFFe2(WO4)3 or LixFe2(MoO4)3. This difference is discussed in terms of the influence of the counter cation on the solid-state Fe3+2+ redox couple.

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