本文へジャンプ

成果報告書詳細
管理番号20190000000119
タイトル*平成30年度中間年報 NEDO先導研究プログラム エネルギー・環境新技術先導研究プログラム 「大容量蓄電池の動的状態解析に関する研究開発」
公開日2019/4/26
報告書年度2018 - 2018
委託先名公益財団法人高輝度光科学研究センター 日産自動車株式会社 株式会社本田技術研究所 パナソニック株式会社 国立大学法人京都大学 学校法人立命館
プロジェクト番号P14004
部署名材料・ナノテクノロジー部
和文要約
英文要約We are developing synchrotron x-ray imaging techniques for analyzing the dynamical behaviors of large capacity batteries. Using x-rays higher than 100 keV, the inside of batteries can be visually examined under a thermal runaway condition. The techniques include x-ray transmission imaging, computed tomography, x-ray scattering imaging and x-ray diffraction imaging. In FY2018 we have designed a chamber for battery examination and then successfully installed it into BL28B2 at SPring-8. As a prototype, the chamber can treat the thermal runway of 2-3Ah class batteries, such as 18650, equipped with a nail penetration device. In parallel with the installation, we have developed x-ray imaging techniques.
After the chamber installation, x-ray transmission imaging and computed tomography have been tested. The evolution of internal structure damages during thermal runaway induced by nail penetration has been clearly observed on a 2Ah laminate cell (DTP605068)using time-resolved x-ray transmission imaging. Another test on 18650 has confirmed that the exposure of 2ms is sufficient to diagnose the battery using the x-ray transmission imaging and the rate of 1 Hz ( exposure: 2ms, direction: 500 ) has been achieved for x-ray computed tomography.
X-ray scattering imaging has been tested at BL08W using 115 keV x-rays. This technique provides two-dimensional structural information, complementary to x-ray transmission imaging. In future, a combination of scattering and transmission techniques enables high-speed, three-dimensional structural observation of 100 Hz. Prior to this combination use, we have examined the x-ray scattering imaging technique. We measured a 18650 cell and found that the spatial resolution of 130 -m has been achieved, better than the project goal of 200 -m. For temporal resolution, 34 ms is already achieved for actual observation.
X-ray diffraction imaging can monitor the spatial variation of temperature inside a battery, through the variation of lattice constants in Cu or Al, collector materials of batteries. For testing this idea, we measured x-ray diffraction images of a test piece, a pair of two 100-m thick Cu plates separated by 10mm. One Cu plate is mounted on a heater so that its temperature can be increased. The x-ray diffraction images observed by varying one Cu plate, show that the 111 diffraction intensity of the heated Cu plate decreases as the temperature increases, indicating that temperature mapping inside a battery is feasible using x-ray diffraction imaging.
    
We have organized a R&D promotion committee for this project, consisting of seven committee members, and had a committee meeting on 6th November, 2018 in Tokyo.

We have conducted a worldwide survey on x-ray imaging techniques for thermal runaway. We visited ESRF (European Synchrotron Radiation Facility, France), APS (Advanced Photon Source, USA), PETRA-III (Germany), worldwide counterparts to SPring-8. We also visited Prof. Paul Sheering (University College London) who is an expert in this research field. After these visits, we have confirmed that the project has the world’s top goal.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る