Characterization of electrode/electrolyte interface for lithium batteries using in situ synchrotron X-ray reflectometry—A new experimental technique for LiCoO2 model electrode
- 作者：Masaaki Hirayama ; Noriyuki Sonoyama ; Takeshi Abe ; Machiko Minoura ; Masumi Ito ; Daisuke Mori ; Atsuo Yamada ; Ryoji Kanno ; Takahito Terashima ; Mikio Takano ; <i>et al.i>
- 关键词：Epitaxial thin-film ; Lithium battery ; Electrode/electrolyte interface ; Reflectivity
- 刊名：Journal of Power Sources
- 出版年：2007
- 期刊代码：58_03787753
- 类别：ce
- 出版时间：1 June 2007
- 卷：168
- 期：2
- 页码：493-500
- 文件大小：1105 K
摘要
A new experimental technique was developed for detecting structure changes at electrode/electrolyte interface of lithium cell using X-ray reflectometry and two-dimensional model electrodes with a restricted lattice-plane. The electrodes were constructed with an epitaxial film of LiCoO2 synthesized by pulsed laser deposition method. The orientation of the epitaxial film depends on the substrate plane; the 2D layer of LiCoO2 is parallel to the SrTiO3 (1 1 1) substrate ion:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TH1-4N9881K-1&_mathId=mml4&_user=10&_cdi=5269&_rdoc=25&_acct=C000050221&_version=1&_userid=10&md5=56aa8a08df4b5c804dfc8c7fbf43d232" title="Click to view the MathML source">((0 0 3)LiCoO2//(1 1 1)SrTiO3), while the 2D layer is perpendicular to the SrTiO3 (1 1 0) substrate ion:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TH1-4N9881K-1&_mathId=mml5&_user=10&_cdi=5269&_rdoc=25&_acct=C000050221&_version=1&_userid=10&md5=83ec6e5a5da167f8b9b266ee16d2b45e" title="Click to view the MathML source">((1 1 0)LiCoO2//(1 1 0)SrTiO3). The anisotropic properties were confirmed by electrochemical measurements. <i>Ex situi> X-ray reflectivity measurements indicated that the impurity layer existed on the as-grown LiCoO2 was dissolved and a new SEI layer with lower density was formed after soaking into the electrolyte. <i>In situi> X-ray reflectivity measurements indicated that the surface roughness of the intercalation (1 1 0) plane increased with applying voltages, while no significant changes in surface morphology were observed for the intercalation non-active (0 0 3) plane during the pristine stage of the charge–discharge process.