TY - JOUR
T1 - Transition metal NaMF3 compounds as model systems for studying the feasibility of ternary Li-M-F and Na-M-F single phases as cathodes for lithium-ion and sodium-ion batteries
AU - Dimov, Nikolay
AU - Nishimura, Akihiro
AU - Chihara, Kuniko
AU - Kitajou, Ayuko
AU - Gocheva, Irina D.
AU - Okada, Shigeto
N1 - Funding Information:
This research was supported in part by a grant from the RISING project of the New Energy and industrial Development Organization (NEDO), Japan .
PY - 2013
Y1 - 2013
N2 - The high electronegativity of fluorine suggests that fluorides may enable cathode materials for lithium-ion and sodium-ion batteries with higher voltage profiles for insertion or larger capacities for conversion. Iron has traditionally been studied as a redox center in fluorine-based cathodes, but the other metals have rarely been investigated. We demonstrate that the NaMF 3 series (M = Mn, Fe, Co, Ni, Cu) offers a convenient means to compare the feasibility of the first row transition metals employed as fluorine-based cathodes for sodium-ion and lithium-ion batteries. NaFeF 3 was found to be the only electrochemically active compound, which is able to undergo reversible Na+ reinsertion. This is ascribed to: (i) the chemical nature of the charged state FeF3 which is the only fluorine acceptor and chemically the most stable compound among the other MF3 and (ii) the existence of two FeF3 polymorphs with closer structural resemblance to the parent NaFeF3, which may contribute to the rigidity of the parent NaFeF3 structure during desodiation.
AB - The high electronegativity of fluorine suggests that fluorides may enable cathode materials for lithium-ion and sodium-ion batteries with higher voltage profiles for insertion or larger capacities for conversion. Iron has traditionally been studied as a redox center in fluorine-based cathodes, but the other metals have rarely been investigated. We demonstrate that the NaMF 3 series (M = Mn, Fe, Co, Ni, Cu) offers a convenient means to compare the feasibility of the first row transition metals employed as fluorine-based cathodes for sodium-ion and lithium-ion batteries. NaFeF 3 was found to be the only electrochemically active compound, which is able to undergo reversible Na+ reinsertion. This is ascribed to: (i) the chemical nature of the charged state FeF3 which is the only fluorine acceptor and chemically the most stable compound among the other MF3 and (ii) the existence of two FeF3 polymorphs with closer structural resemblance to the parent NaFeF3, which may contribute to the rigidity of the parent NaFeF3 structure during desodiation.
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U2 - 10.1016/j.electacta.2013.05.103
DO - 10.1016/j.electacta.2013.05.103
M3 - Article
AN - SCOPUS:84888316460
VL - 110
SP - 214
EP - 220
JO - Electrochimica Acta
JF - Electrochimica Acta
SN - 0013-4686
ER -