成果報告書詳細
管理番号20140000000206
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 (9)
公開日2014/5/17
報告書年度2013 - 2013
委託先名大学共同利用機関法人高エネルギー加速器研究機構
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We have built a new special environment neutron powder diffractometer, SPICA, at BL09 in the Material and Life science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). SPICA is the world first neutron instrument dedicated solely to the study of Li-ion batteries. SPICA is optimized for in situ measurements to clarify the structural changes of battery materials at the atomic level during charging and discharging.
During commissioning of SPICA, various standard samples and known lithium oxides were examined and structural analyses of them gave satisfactory results.
Many in situ experiments using 18650 cell have been carried out. The structural changes of the materials, which depend on the lithium content in a commercialized Li-ion battery, were clearly observed. Changes in both cathode and anode were easily observed. In anode, difference in staging phenomena during charging and discharging was discovered, which suggests inhomogeneous distribution of chemical reaction. Higher rate charging/discharging induced more drastic changes.
We have been developing various crystal structural analysis software and the first stage of development of the Rietveld analysis code, the Maximum Entropy Method code, visualization codes have been completed. Applying them to the solid state electrolyte, Li10GeP2S12, revealed the changes in the nuclear scattering density above room temperature, indicating conduction pathway were formed.
The two dimensional imaging method have been developed using absorption and Bragg edge techniques.
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