TY - JOUR
T1 - Electrochemical reactions and cathode properties of Fe-doped Li2O for the hermetically sealed lithium peroxide battery
AU - Harada, Kosuke
AU - Hibino, Mitsuhiro
AU - Kobayashi, Hiroaki
AU - Ogasawara, Yoshiyuki
AU - Okuoka, Shin Ichi
AU - Yonehara, Koji
AU - Ono, Hironobu
AU - Sumida, Yasutaka
AU - Yamaguchi, Kazuya
AU - Kudo, Tetsuichi
AU - Mizuno, Noritaka
N1 - Funding Information:
A part of this work was conducted with the support of JSPS Grants-in-Aid for Scientific Research (B) Grant Number 26289371 , the support of JSPS Grant-in-Aid for Young Scientists (B) Grant Number 15K18326 . Prof. Atsuo Yamada and Dr. Shinichi Nishimura are acknowledged for their invaluable assistance with the Mössbauer spectroscopy. Technical researchers at Aichi Synchrotron Radiation Center, Mr. Toshiki Hirotomo and Mr. Hiroyuki Morimoto, are also acknowledged for their invaluable help with the XAS.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/8/1
Y1 - 2016/8/1
N2 - Fe-doped Li2O (FDL) is synthesized mechanochemically and is demonstrated as a new Co-free cathode material for use in sealed Li2O2 batteries, which have been proposed as high energy density batteries. Fe3+ ions are substitutionally doped into the Li sites in an antifluorite-type Li2O structure to create FDL. The FDL consists of (Li0.82Fe0.06)2O (d-FDL) and high-temperature form of Li5FeO4 (o-FDL), in which Fe3+ ions disorderly and orderly arranged, respectively. According to the Mössbauer spectra and quantitative peroxide species analysis, the FDL cathode operates principally based on the redox reaction between O22- and O2-. X-ray diffraction study reveals that the reversible formation of O22- proceeds mainly in the d-FDL. An irreversible side reaction involving the evolution of oxygen gas occurs when the cathode is charged to more than 250 mAh g-1. The FDL (Fe/(Li + Fe) = 10 at%) cathode exhibits a reversible capacity of 200 mAh g-1 over 200 cycles at a current density of 22.5 mA g-1.
AB - Fe-doped Li2O (FDL) is synthesized mechanochemically and is demonstrated as a new Co-free cathode material for use in sealed Li2O2 batteries, which have been proposed as high energy density batteries. Fe3+ ions are substitutionally doped into the Li sites in an antifluorite-type Li2O structure to create FDL. The FDL consists of (Li0.82Fe0.06)2O (d-FDL) and high-temperature form of Li5FeO4 (o-FDL), in which Fe3+ ions disorderly and orderly arranged, respectively. According to the Mössbauer spectra and quantitative peroxide species analysis, the FDL cathode operates principally based on the redox reaction between O22- and O2-. X-ray diffraction study reveals that the reversible formation of O22- proceeds mainly in the d-FDL. An irreversible side reaction involving the evolution of oxygen gas occurs when the cathode is charged to more than 250 mAh g-1. The FDL (Fe/(Li + Fe) = 10 at%) cathode exhibits a reversible capacity of 200 mAh g-1 over 200 cycles at a current density of 22.5 mA g-1.
KW - Cathode material
KW - Fe-doped LiO
KW - Li-ion battery
KW - LiO battery
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U2 - 10.1016/j.jpowsour.2016.04.141
DO - 10.1016/j.jpowsour.2016.04.141
M3 - Article
AN - SCOPUS:84966295035
VL - 322
SP - 49
EP - 56
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -
