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Electrochemical Performance of BiF 3 ‐BaF 2 Solid Solution with Three Different Phases on a Fluoride Shuttle Battery System
Author(s) -
Konishi Hiroaki,
Minato Taketoshi,
Abe Takeshi,
Ogumi Zempachi
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202000713
Subject(s) - orthorhombic crystal system , fluoride , materials science , solid solution , electrochemistry , barium fluoride , hexagonal phase , barium , phase (matter) , crystal structure , hexagonal crystal system , crystal (programming language) , battery (electricity) , crystallography , analytical chemistry (journal) , inorganic chemistry , chemistry , electrode , metallurgy , power (physics) , physics , organic chemistry , quantum mechanics , chromatography , computer science , nuclear physics , programming language
Solid solution of bismuth(III) fluoride (BiF 3 ) and barium(II) fluoride (BaF 2 ) with a variety of crystal structures was prepared, and their electrochemical performances were evaluated on a fluoride shuttle battery (FSB) system. BiF 3 ‐BaF 2 based solid solution (Bi 1‐ x Ba x F 3‐ x ( x =0) with orthorhombic phase, x =0.2 with hexagonal phase, and x =0.4 with cubic phase) were successfully obtained with the mechanical alloy method. The change from Bi 1‐ x Ba x F 3‐ x ( x =0) (orthorhombic) to x =0.2 (hexagonal) improved the initial reversible capacity and the capacity retention during cycling. The change from x =0.2 (hexagonal) to 0.4 (cubic) led to further improvement in capacity retention during cycling; however, the initial reversible capacity decreased due to the substitution of excess amount of barium that did not contribute to the redox reaction. For the BiF 3 ‐based compound, controlling the crystal structure and substitution of inactive element affected the FSB performance.