Nanoscale Observation of the Electronic and Local Structures of LiCoO2 Thin Film Electrode by Depth-Resolved X-ray Absorption Spectroscopy

作者：Takamatsu Daiko^*; Nakatsutsumi Takayuki; Mori Shinichiro; Orikasa Yuki; Mogi Masato; Yamashige Hisao; Sato Kenji; Fujimoto Takahiro; Takanashi Yu; Murayama Haruno; Oishi Masatsugu; Tanida Hajime; Uruga Tomoya; Arai Hajime; Uchimoto Yoshiharu; Ogumi Zempachi

来源：Journal of Physical Chemistry Letters, 2011, 2(20): 2511-2514.

DOI：10.1021/jz2011226

The electronic and local structural changes during electrochemical delithiation processes occurring at the electrode/electrolyte interface of LiCoO2 thin film electrode prepared by pulsed laser deposition were clarified by using depth-resolved X-ray absorption spectroscopy technique. We successfully obtained detailed microstructural information around the Li1-xCoO2 electrode surface with a depth resolution of ca. 3 nm using a spectro-electrochemical cell. Our results revealed a remarkable increase in the local distortions at the Li1-xCoO2 surface after charging, and the distortions extended to the bulk of Li1-xCoO2. Such unprecedented local distortions might be attributable to the marked deterioration of the electrodes.

• 出版日期2011-10-20