TY - JOUR
T1 - Site-Selective Analysis of Nickel-Substituted Li-Rich Layered Material
T2 - Migration and Role of Transition Metal at Charging and Discharging
AU - Komatsu, Hideyuki
AU - Minato, Taketoshi
AU - Matsunaga, Toshiyuki
AU - Shimoda, Keiji
AU - Kawaguchi, Tomoya
AU - Fukuda, Katsutoshi
AU - Nakanishi, Koji
AU - Tanida, Hajime
AU - Kobayashi, Shunsuke
AU - Hirayama, Tsukasa
AU - Ikuhara, Yuichi
AU - Arai, Hajime
AU - Ukyo, Yoshio
AU - Uchimoto, Yoshiharu
AU - Matsubara, Eiichiro
AU - Ogumi, Zempachi
N1 - Funding Information:
This work was supported by the Research and Development Innovative for Scientific Innovation of New Generation Battery (RISING) project from New Energy and Industrial Technology Development Organization (NEDO), Japan. The authors thank Dr Yasuhiro Takabayashi, Mr Takahiro Kakei, and Mr Yuji Kamishima for their supports on sample preparations and electrochemical measurements. The XAFS and DAFS measurements were performed with the approval of the Japan Synchrotron Radiation Research Institute (JASRI, Proposal No. 2014B7601, 2015A1013, 20151014).
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/9/6
Y1 - 2018/9/6
N2 - Li-rich type manganese oxides are one of the most promising cathodes for lithium-ion batteries in recent years; thanks to their high energy density. In these cathodes, partial substitution of manganese by other transition metals such as nickel and cobalt has been proposed and shown to be effective in improving the performance; however, the role of such metals in the battery performance has not been clarified. We examined Ni-substituted Li2MnO3 as a model of Li2MeO3 solid-solution cathodes to understand the effect of the substituted Ni on the electrode performances by using a combination of resonant X-ray diffraction spectroscopy (RXDS) and operando X-ray absorption spectroscopy. The capacity and cyclability were improved by substituting Ni into the Li2MnO3 phase, which suggests its important roles in the cathodes. The change in the oxidation state and transbilayer migration of the transition metals as a function of the operating potential during the first charge-discharge processes were revealed by the site-selective analysis of RXDS. We discuss the influence of the irreversible and reversible migration of Ni and Mn ions on the electrode performance.
AB - Li-rich type manganese oxides are one of the most promising cathodes for lithium-ion batteries in recent years; thanks to their high energy density. In these cathodes, partial substitution of manganese by other transition metals such as nickel and cobalt has been proposed and shown to be effective in improving the performance; however, the role of such metals in the battery performance has not been clarified. We examined Ni-substituted Li2MnO3 as a model of Li2MeO3 solid-solution cathodes to understand the effect of the substituted Ni on the electrode performances by using a combination of resonant X-ray diffraction spectroscopy (RXDS) and operando X-ray absorption spectroscopy. The capacity and cyclability were improved by substituting Ni into the Li2MnO3 phase, which suggests its important roles in the cathodes. The change in the oxidation state and transbilayer migration of the transition metals as a function of the operating potential during the first charge-discharge processes were revealed by the site-selective analysis of RXDS. We discuss the influence of the irreversible and reversible migration of Ni and Mn ions on the electrode performance.
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U2 - 10.1021/acs.jpcc.8b05539
DO - 10.1021/acs.jpcc.8b05539
M3 - Article
AN - SCOPUS:85052907507
VL - 122
SP - 20099
EP - 20107
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 35
ER -
