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成果報告書詳細
管理番号20170000000218
タイトル*平成28年度中間年報 革新型蓄電池実用化促進基盤技術開発(国立大学法人名古屋工業大学)
公開日2017/11/14
報告書年度2016 - 2016
委託先名国立大学法人名古屋工業大学
プロジェクト番号P16001
部署名スマートコミュニティ部
和文要約
英文要約Research & Development Initiative for Scientific Innovation of New Generation Batteries 2 (RISING2); (FY2016-FY2018) FY2016 Annual Report, Nagoya Institute of Technology, Japan 

In this fiscal year, we performed x-ray diffraction measurements on lithium ion batteries (LIB). We developed a technique for extracting a weak oscillational signal originating from the electrolyte in rechargeable batteries, which is useful for analyzing the structural variation of electrolyte during the charge and discharge. In particular, we performed (i) development of specially designed half cell for LIB, (ii) x-ray diffraction measurements using two dimensional (2D) detector, and (iii) extraction of the diffraction pattern coming from the electrolyte.

(i) Development of Specially Designed Half Cell for Lithium Ion Battery
We developed a new LIB half cell for extracting the signals from the electrolyte. We used sapphire disks for the X-ray windows for suppressing the background noise from the container. The components of the battery such as electrolyte (EC+EMC, LiPF6), electrode (Li film, LCO), and separator are sandwiched between two coin type containers. We confirmed that the cell works well as a rechargeable battery by the cyclic voltammetry measurements.

(ii) X-Ray Diffraction Measurements using 2D Detector
We performed X-ray diffraction measurements for the LIB cell at beamline BL28XU of SPring-8. Using the 2D detector, the measurement time was reduced to about 190 seconds, which is much shorter than in the case of 0D detector, a few tens of minutes to one hour. Such a high efficient  measurement is important for obtaining the diffraction pattern during the fast charging and discharging. We also used CdTe energy dispersive detector for obtaining energy spectra, which is necessary to estimate the contribution of Compton scattering.

(iii) Extraction of the Diffraction Pattern Coming from the Electrolyte
From the 2D diffraction image we derived the 1D diffraction pattern. In contrast to the diffraction pattern from the conventional cell with Al laminate film, we clearly observed the weak oscillational pattern originating from the electrolyte in addition to the Bragg peaks coming from the electrodes.
We extracted halo pattern of the electrolyte and calculated the pair correlation function g(r). Here, the extraction was only simply carried out by smoothing the data, but we observed the peak corresponding to the P-F and P-P bonds. These results demonstrate that the present technique is useful for the structural analysis of the electrolyte.
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