成果報告書詳細
管理番号20130000000415
タイトル*平成24年度中間年報 革新型蓄電池先端科学基礎研究事業 革新型蓄電池先端科学基礎研究開発 (3)
公開日2014/1/28
報告書年度2012 - 2012
委託先名学校法人立命館大学
プロジェクト番号P09012
部署名スマートコミュニティ部
和文要約
英文要約 To visualize electric potential distributions in batteries during charge-discharge cycling is extremely useful for understanding the electrochemical reactions that control their performance. In situ electron holography enables us to directly observe such potential distributions in an all-solid-state lithium ion battery. In addition, scanning transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDS), and electron energy loss spectroscopy (EELS) are powerful techniques to analyze crystal structures, crystal defects, chemical compositions in batteries, allowing practical issues with battery materials to be resolved, thereby contributing to the development of safer, cheaper, and more efficient batteries. In fiscal year 2012 we carried out the following experiments and obtained several new and groundbreaking results.
The group at Nagoya University participating in this project prepared an all-solid-state thin lithium ion battery sample consisting of a positive electrode (300 nm in thick), an electrolyte (2.5 microns thick), and a negative electrode (100 nm thick). This model battery was thin enough to be suitable for electron holography characterization, and enable the entire cross section of the battery to be observed. A TEM specimen was prepared at JFCC using a combination of focused ion beam and argon ion beam milling. We succeeded in observing potential distributions across the entire battery region from the positive electrode to the negative electrode during charge-discharge cycling for the first time.
In addition, we succeeded in clearly observing a thin zirconium oxide later on the surface of a positive electrode of LiCoO2 using aberration-corrected STEM. We also succeeded in analyzing Li-ion distributions in an in situ formed negative electrode using spatially resolved EELS. In this project we have successfully demonstrated that these techniques are indispensable to the future development of high-performance batteries.
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