Soft X-ray Spectroscopy Studies for Electrode Materials to Clarify the Electronic-Structure Change and Charge-Transfer Effects in the Lithiation and Delithiation Processes

Daisuke Asakura , Yusuke Nanba , Takaaki Sudayama , Hirofumi Matsuda , Jun Miyawaki , Yoshihisa Harada , Jinghua Guo , Eiji Hosono a a Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba Ibaraki 305-8568, JAPAN b AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8565, JAPAN c Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, JAPAN d Synchrotron Radiation Research Organization, The University of Tokyo, 1-1-1 Koto, Sayo, Sayo-gun, Hyogo 679-5198, JAPAN e Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, U.S.A.