Mapping of Heterogeneous Chemical States of Lithium in a LiNiO2-Based Active Material by Electron Energy-Loss Spectroscopy

作者：Muto Shunsuke^*; Tatsumi Kazuyoshi; Sasaki Tsuyoshi; Kondo Hiroki; Ohsuna Tetsu; Horibuchi Kayo; Takeuchi Yoji

来源：Electrochemical and Solid-State Letters, 2010, 13(8): A115-A117.

DOI：10.1149/1.3439641

• chemical analysis
• electrochemical electrodes
• electron energy loss spectra
• lithium compounds
• scanning-transmission electron microscopy
• secondary cells
• transition metals

It is difficult to analyze the local concentrations and chemical states of lithium in lithium-ion secondary battery electrodes by microanalysis techniques based on transmission electron microscopy because the core excitation spectra of transition metals invariably overlap with the absorption/emission spectra of Li-K. We propose a promising analysis method that enables the spatial distribution of lithium with different chemical states from the original phase in a LiNiO2-based positive electrode to be visualized. It employs a suite of spectrum imaging techniques including scanning transmission electron microscopy, electron energy-loss spectroscopy, and multivariate curve resolution. This method is successfully applied to a cross-sectioned positive electrode.

• 出版日期2010