LiFeOHS is a material with Li(OH) layers intercalated between FeS planes. Its hydrothermal synthesis in various concentrations of LiOH yields materials with a high non-stoichiometry of the Li/Fe ratio which can be explained by partial substitution of Li for Fe in the Li(OH) layers. Thermogravimetry, X-ray diffraction and Mössbauer studies indicate that the charge balance is obtained by substitution of hydroxyl ions OH by oxide ions O. This material has been tested as an electrode for lithium-ion batteries against lithium metal. Specific capacities above 200 mA h g at C/10 are achieved, involving 1 lithium per chemical formula when cycled between 1 V and 3 V lithium. The first irreversible discharge leads to the insertion of one lithium atom and the evolution of hydrogen gas while iron remains in its +2-oxidation state. An original LiOFeS oxysulfide is formed. The following reversible oxidation/reduction cycles involve the Fe/Fe redox couple between the two limiting compositions: LiOFeS and LiOFeS.
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