Abstract
The chemical desodiation of non-doped and vanadium-doped sodium thiochromites has been studied. The changes in the chemical composition and X-ray diffraction patterns during desodiation of the stoichiometric compound reveal that the vanadium-doped thiochromite can be more effectively desodiated. The presence of vanadium in the disulfide layers enhances the covalency of the MS bond; this probably facilitates a first order phase transition of the vanadium-doped material during deintercalation of both Na + and Li +. The electrochemical performance of cathodes prepared from the chemically desodiated, vanadium-doped thiochromite is assessed by cycling in a 1 M LiClO 4/PC + DME solution at a 3 h rate between 1.8 and 3.4 V. The volumetric energy density of the pressed cathodes is 0.51 W h cm −3 at the 100th cycle and drops to 0.35 W h cm −3 after 500 cycles.
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