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成果報告書詳細
管理番号20170000000223
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(学校法人立命館)
公開日2017/11/14
報告書年度2016 - 2016
委託先名学校法人立命館
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, Ritsumeikan University, Japan

 In the SR center of Ritsumeikan University, we have devoted ourselves to the development of the analytical methods for secondary batteries by using soft X-ray synchrotron radiation from the compact storage ring, complimentary to SPring-8. Four existed beamlines, ultra-soft X-ray XAFS (BL-2, 11), soft X-ray XAFS (BL-10, 13) and hard X-ray XAFS (BL-3, 4, 5) beamlines are dedicated to secondary battery studies. Followings are research activities produced in these beamlines.
(1) Characterization of several new types of batteries with soft X-ray XAFS
Recently, several new types of secondary batteries have been developed in AIST, such as amorphous metal polysulfides and metal fluorides, which are promising as future batteries in practical use. Soft X-ray XAFS was effectively used to examine which elements are responsible in the electrochemical reaction and what happens in the charge/discharge processes.
(2) In situ soft X-ray XAFS measurements of batteries during charge/discharge
In situ experiments are much more desirable than ex situ experiments for the study of charge/discharge mechanism of secondary batteries. Unique cells have been developed for in situ XAFS experiments both in the soft X-ray and ultra-soft X-ray regions. In situ Si K-XAFS experiment was successfully performed for anode silicon during chare and discharge. It was revealed that the charging proceeds in three steps; (1) decomposing of silicon crystal, creation of a Li silicide phase and finally transition to another Li silicide phase. In the ultra-soft X-ray region, in situ XAFS experiment was performed for an all solid state battery which is composed of lithium ion conducting glass ceramics, spin coated with LiMn2O4. Although it was still preliminary, oxidation of Mn from 3.5 to 4.0 by charge was clearly observed.
(3) 2D imaging XAFS study for the temperature effect of reaction distributions
2D imaging XAFS was applied to the study of the temperature effect on the reaction distribution of cathode LiFePO4 during charge/discharge. By elevating the temperature to 80 °C, one can expect more diffused contrast of Fe2+ (charging state) and Fe3+ (discharging state), but in reality more distinct contrast was observed in the spatial distribution. This temperature effect might be explained by the competing process between ionic ad electronic conductions.
(4) VDXAFS method for the reaction distribution of the LiMn2O4 electrode
VD(Vertically Dispersive) XAFS is an unique method to obtain quick 1D imaging XAFS. It was applied to study how the reaction proceeds by the voltage jump charging in the LiMn2O4 electrode. Although 2D imaging XAFS experiment indicated a uniform charging, Mn K-VDXAFS clearly showed inhomogeneous reaction velocity. With this method, we can examine the time-resolved charge/discharge mechanism.
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