Operando Mössbauer Spectroscopy Investigation of the Electrochemical Reaction with Lithium in Bronze-Type FeF3·0.33H2O

Abstract : The electrochemical reaction of bronze-type FeF3·0.33H2O, synthesized via a simple room-temperature solution route, with lithium was investigated by operando Mössbauer spectroscopy and X-ray diffraction. The two techniques revealed a complex electrochemical mechanism where the pristine crystalline compound is gradually transformed into an amorphous material containing nanodomains of a FeF2-like rutile structure mixed to iron nanoparticles. Upon charge, two steps are dominating the electrochemical behavior: partial reformation of the initial bronze structure and oxidation to Fe(III). This reaction mechanism, however, is not constant, and noticeable variation can be observed during galvanostatic cycling (up to 55 cycles) until eventually an amorphous material containing rutile nanodomains composes the final active electrode. The material performance, under the form of a fluoride/graphene oxide composite, is also assessed with respect to the long-term effect of the depth of first discharge.
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https://hal.archives-ouvertes.fr/hal-01399571
Contributor : Lorenzo Stievano <>
Submitted on : Saturday, November 19, 2016 - 4:21:54 PM
Last modification on : Tuesday, May 28, 2019 - 2:06:13 PM

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Donato Ercole Conte, Lidia Di Carlo, Moulay Tahar Sougrati, Fraisse Bernard, Lorenzo Stievano, et al.. Operando Mössbauer Spectroscopy Investigation of the Electrochemical Reaction with Lithium in Bronze-Type FeF3·0.33H2O. Journal of Physical Chemistry C, American Chemical Society, 2016, 120 (42), pp.23933-23943. ⟨10.1021/acs.jpcc.6b06711⟩. ⟨hal-01399571⟩

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