成果報告書詳細
管理番号20120000000299
タイトル*平成23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2012/6/27
報告書年度2011 - 2011
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
和文要約和文要約等以下本編抜粋:
1. 共同研究の内容及び成果等
(1) 本研究の狙い
一般財団法人ファインセラミックスセンター(以下、JFCCという)は本プロジェクトの中
の「電池反応解析グループ」に所属している。そこで、「in situ 電子線ホログラフィー」という研究開発テーマを設定し、「各種の全固体型モデルLiイオン電池を作製し、ホログラフィー電子顕微鏡内で充放電させながら電池内部(陽極/電解質界面、陰極/電解質界面等)の電位分布(イオン分布)を解析する手法を開発する」研究を実施してきた。
英文要約Title: Research & Development Initiative for Scientific Innovation of New Generation Batteries (RISING) Project (FY2009-FY2013) FY2011Annual Report
In-situ Electron Holography (JFCC)
Rechargeable batteries can serve as storage devices for renewable energy. Therefore, they are considered an essential technology for the 21st century. Of the several battery technologies available, Li-ion batteries are the most promising at present because they can provide the largest energy storage densities. However, the electrochemical reactions in the batteries that control their performance are not yet fully understood. The ability to visualize electric potential distributions would be very useful for analyzing the electrochemical reactions taking place during cycling, and such knowledge could help contribute to the development of safer, cheaper, and more efficient batteries.
To demonstrate this, we employed an all-solid-state Li-ion battery and in situ electron holography. Li-ion battery samples were prepared in Shizuoka University. We prepared a TEM sample from a working battery using the Focused Ion Beam method. The TEM sample was loaded into the microscope with a holder equipped with two electrodes for applying voltage. The microscope and a computer were combined and dynamic holograms recorded by a TV camera were sent to the computer to reconstruct electric potential distributions dynamically.
Charging voltage of 1.2V was applied to the sample and the electric potential distributions were measured. In this condition large potential drop was observed near the interface between the electrolyte and the negative electrode, while very small potential drop was seen at the positive electrode side. The potential drop at the negative electrode side was not observed after discharging. This implies that the ion diffusion resistance is mainly at the negative electrode side. Furthermore, we introduced an Aberration-Corrected Scanning Transmission Electron Microscope to study the structures and chemical components of batteries at atomic level. We believe that the combination research by in situ electron holography and high resolution STEM will be helpful in understanding electrochemical reactions in batteries and contribute to developing superior batteries.
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