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Title
Japanese: 
English:Structural Understanding of Superior Battery Properties of Partially Ni-Doped Li2MnO3 as Cathode Material 
Author
Japanese: Toshiyuki Matsunaga, Hideyuki Komatsu, Keiji Shimoda, 湊 丈俊, 米村 雅雄, 神山 崇, Shunsuke Kobayashi, Takeharu Kato, Tsukasa Hirayama, 幾原 雄一, 荒井 創, Yoshio Ukyo, 内本 喜晴, Zempachi Ogumi.  
English: Toshiyuki Matsunaga, Hideyuki Komatsu, Keiji Shimoda, Taketoshi Minato, Masao Yonemura, Takashi Kamiyama, Shunsuke Kobayashi, Takeharu Kato, Tsukasa Hirayama, Yuichi Ikuhara, Hajime Arai, Yoshio Ukyo, Yoshiharu Uchimoto, Zempachi Ogumi.  
Language English 
Journal/Book name
Japanese:The Journal of Physical Chemistry Letters 
English:The Journal of Physical Chemistry Letters 
Volume, Number, Page Vol. 7        pp. 2063
Published date May 16, 2016 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1021/acs.jpclett.6b00587
Abstract We examined the crystal structures of Li2(NixMn1−x)O3(−δ) (x = 0, 1/10, 1/6, and 1/4) to elucidate the relationship between the structure and electrochemical performance of the compounds using neutron and synchrotron X-ray powder diffraction analyses in combination. Our examination revealed that these crystals contain a large number of stacking faults and exhibit significant cation mixing in the transition-metal layers; the cation mixing becomes significant with an increase in the Ni concentration. Charge−discharge measurements showed that the replacement of Mn with Ni lowers the potential of the charge plateau and leads to higher charge−discharge capacities. From a topological point of view with regard to the atomic arrangement in the crystals, it is concluded that substituting Mn in Li2MnO3 with Ni promotes the formation of smooth Li percolation paths, thus increasing the number of active Li ions and improving the charge−discharge capacity.

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