High potential durability of LiNi0.5Mn1.5O 4 electrodes studied by surface sensitive X-ray absorption spectroscopy

Hiroyuki Kawaura, Daiko Takamatsu, Shinichiro Mori, Yuki Orikasa, Hidetaka Sugaya, Haruno Murayama, Kouji Nakanishi, Hajime Tanida, Yukinori Koyama, Hajime Arai, Yoshiharu Uchimoto, Zempachi Ogumi

研究成果: ジャーナルへの寄稿学術誌査読

27 被引用数 (Scopus)


Phenomena at electrode/electrolyte interface of LiNi0.5Mn 1.5O4 are studied by in situ total-reflection fluorescence X-ray absorption spectroscopy (TRF-XAS), ex situ X-ray photoelectron spectroscopy (XPS), and electrochemical tests. Flat and well-defined thin films of LiNi0.5Mn1.5O4 prepared by pulsed laser deposition (PLD) are used as model electrodes to facilitate the observation of the interface. The thin-film LiNi0.5Mn1.5O4 electrode showed good cycling characteristics at around 4.7 V vs. Li/Li +. The TRF-XAS measurements reveal that nickel and manganese species at the surface have almost the same chemical states and local environments as those in the bulk when in contact with organic electrolyte solutions (1 mol dm-3 LiClO4 in a 1:1 volumetric mixture of ethylene carbonate and diethyl carbonate). This is in sharp contrast to the behavior of a LiCoO2 electrode, in which the surface cobalt species is irreversibly reduced by soaking to the organic electrolyte solutions, leading to gradual material deterioration during the delithiation/lithiation cycling (D. Takamatsu et al., Angew. Chem. Int. Edit., 51 (2012) 11597). It is suggested that the electrolyte decomposition products detected by XPS form a protective layer to restrict the reduction of the surface species of LiNi 0.5Mn1.5O4, leading to good cycling characteristics of LiNi0.5Mn1.5O4 in spite of its high operating potential.

ジャーナルJournal of Power Sources
出版ステータス出版済み - 2014

!!!All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学


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