Investigation of the Lithiation and Delithiation Conversion Mechanisms of Bismuth Fluoride Nanocomposites

Journal Article · Sun Jan 01 04:00:00 EST 2006 · J. Electrochem. Soc.

DOI:https://doi.org/10.1149/1.2167951· OSTI ID:914117

Bervas, M; Mansour, A; Yoon, W; Al-Sharab, J; Badway, F; Cosandey, F; Klein, L; Amatucci, G

Combined in situ X-ray diffraction, in situ X-ray absorption spectroscopy, and selected area electron diffraction analyses have confirmed the occurrence of a reversible conversion reaction in the BiF{sub 3}/C nanocomposite upon cycling, which leads to the formation of Bi0 and LiF during lithiation and the reformation of BiF{sub 3} during delithiation. It has been shown that only the high-pressure tysonite phase of BiF{sub 3} reforms during the oxidation sweep and that no bismuth fluoride compound with an oxidation state of the bismuth lower than 3 is formed as intermediate during the lithiation or delithiation reactions. Finally, it has been demonstrated that the different plateaus or pseudo plateaus observed on the lithiation and delithiation voltage profiles stem from polarization changes brought about by the dramatic structural changes occurring in the nanocomposite upon cycling. A model, based on the variation of the electronic and ionic transport mechanisms as a function of the state of completion of the conversion and reconversion reactions, is proposed to explain those polarization changes.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 914117
• Report Number(s): BNL--78685-2007-JA
• Journal Information: J. Electrochem. Soc., Journal Name: J. Electrochem. Soc. Journal Issue: 4 Vol. 153; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ABSORPTION SPECTROSCOPY
BISMUTH
BISMUTH FLUORIDES
ELECTRON DIFFRACTION
NSLS
OXIDATION
POLARIZATION
TRANSPORT
VALENCE
X-RAY DIFFRACTION
national synchrotron light source