The electrochemical reaction of lithium with triclinic FeVO 4 ( a = 6.714(1) Å, b = 8.060(2) Å, c = 9.352(2) Å, α = 96.678(1)°, β = 106.641(1)°, and γ = 101.523(1)°, P -1) has been investigated by means of 57 Fe Mössbauer spectroscopy in order to complement the previous X-ray diffraction and X-ray absorption near edge structure studies on the same system. A complex Fe III → Fe II → Fe 0 or Fe III → Fe II, Fe 0 reduction process has been detected upon the first discharge of the battery down to 0.02 V, with in addition the iron reoxidation during the next charge step. A mechanism based on “lithium adsorption” is proposed in order to explain this unexpected behavior.
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Denis et al. (2000) studied this question.
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