TY - JOUR
T1 - Electrochemical properties of titanium fluoride with high rate capability for lithium-ion batteries
AU - Kitajou, Ayuko
AU - Eguchi, Katsuya
AU - Ishado, Yuji
AU - Setoyama, Hiroyuki
AU - Okajima, Toshihiro
AU - Okada, Shigeto
N1 - Funding Information:
A part of this work was financially supported by the RISING2 projects of the New Energy and Industrial Technology Development Organization, Japan . The Ti K-edge XANES spectra were obtained on the BL11 beamline at the SAGA Light Source with the approval of the Kyushu Synchrotron Light Research Center (proposal 1607055R).
Publisher Copyright:
© 2019 Elsevier B.V.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2019/4/15
Y1 - 2019/4/15
N2 - As a conversion-type active material, we investigated the electrochemical properties and the discharge-charge reaction mechanisms of a TiF3 having the same symmetry as FeF3. First, the insertion reaction of TiF3 proceeded at an average voltage of 2.0 V. Once the voltage of the conversion reaction declined to 0.5 V, the generated metallic Ti was indexed to a cubic system with the Im-3m space group, which is different from the stable structure of metallic Ti with the P63/mmc space group. Moreover, upon recharging to 4.0 V after the conversion reaction, the structure had an amorphous phase of LixTiF3. It is known that, on the first discharge, FeF3 first shows a reversible insertion reaction with 1 Li and then a conversion reaction with the other 2 Li. These results demonstrated that TiF3 had the following overall discharge-charge reaction, which was distinct from that of FeF3: TiF3 + 3Li → 3LiF + Ti ⇄ (3-x)Li+ + LixTiF3 (amorphous phase).
AB - As a conversion-type active material, we investigated the electrochemical properties and the discharge-charge reaction mechanisms of a TiF3 having the same symmetry as FeF3. First, the insertion reaction of TiF3 proceeded at an average voltage of 2.0 V. Once the voltage of the conversion reaction declined to 0.5 V, the generated metallic Ti was indexed to a cubic system with the Im-3m space group, which is different from the stable structure of metallic Ti with the P63/mmc space group. Moreover, upon recharging to 4.0 V after the conversion reaction, the structure had an amorphous phase of LixTiF3. It is known that, on the first discharge, FeF3 first shows a reversible insertion reaction with 1 Li and then a conversion reaction with the other 2 Li. These results demonstrated that TiF3 had the following overall discharge-charge reaction, which was distinct from that of FeF3: TiF3 + 3Li → 3LiF + Ti ⇄ (3-x)Li+ + LixTiF3 (amorphous phase).
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U2 - 10.1016/j.jpowsour.2019.02.056
DO - 10.1016/j.jpowsour.2019.02.056
M3 - Article
AN - SCOPUS:85061810708
SN - 0378-7753
VL - 419
SP - 1
EP - 5
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -
