A New Iron V 2 O 5 Bronze as Electrode Material for Rechargeable Lithium Batteries

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Abstract
A new iron bronze , has been prepared via a sol‐gel process. This compound exhibits an orthorhombic structure which closely resembles that of the parent oxide . A preliminary investigation of its electrochemical properties as rechargeable cathodic material for Li batteries is performed. The results are discussed in relation with the electrochemical behavior known for . Three reversible insertion steps appear in the potential range 3.8 to 2 V vs. Li/Li+. They correspond to a high faradaic yield of 2.5 F per mole of bronze mainly due to the unusually wide Li concentration range involved in the third process located near 2.3 V . The presence of ferric ions in the orthorhombic host lattice is seen to induce interesting features especially in terms of cycle life (potential range: 3.8 to 2 V; C/4 discharge‐charge rate) with a specific capacity of about 200 Ah/kg after 40 cycles.

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