成果報告書詳細
管理番号20140000000193
タイトル*平成25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 (1)
公開日2014/5/17
報告書年度2013 - 2013
委託先名一般財団法人ファインセラミックスセンター
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Title:Research & Development Initiative for Scientific Innovation of New Generation Batteries (RISING) Project (FY2009-FY2015) FY2013 Annual Report

In Situ Electron Holography (JFCC)

It is essential that detailed knowledge about the electrochemical reactions near the interfaces between electrodes and electrolyte be obtained to find clues for the development of more efficient batteries. For this purpose, measurement of electric potential distributions and direct observation of ion distributions are of fundamental importance.

Electron holography is a powerful technique to map electric potential distributions in working batteries, while electron energy loss spectroscopy (EELS) is an effective technique to directly detect lithium distributions.
The two methods provide a powerful means of revealing the electrochemical reactions that occur at electrode/electrolyte interfaces. In fiscal year 2013 we carried out the following experiments and obtained several new results.

A voltage was applied to a thin film of ion conductor (Sample A) and alumina (Sample B), and electric potential distributions have been measured by electron holography. The two samples showed different potential distributions which imply that electron holography provides useful information about ion distribution in the ion conductor. In addition, a method to improve accuracy and resolution has been suggested.

Spatially Resolved Electron Energy Loss Spectroscopy (SR-EELS) measurement of in situ formed negative electrode clearly displayed Li ion distribution as well as valance change of other elements. Obtained data agreed well with the electron potential distributions obtained by electron holography.
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