成果報告書詳細
管理番号20150000000237
タイトル*平成26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2015/5/26
報告書年度2014 - 2014
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By utilizing SPICA (BL09) of the Material and Life science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC), we have been carrying out various in situ measurements using 18650 cell (with 0.05 C to 2 C) to clarify the structural changes of battery materials at the atomic level during charging and discharging. In anode, detailed structural changes during charging and discharging was studied. Even in high rate, the structural changes of electrodes were clearly observed. The inhomogeneous distribution of chemical reaction is more pronounced in high rate studies.
The pulsed neutron two dimensional imaging method has been developed using a Bragg edge technique. From two dimensional distribution of the Bragg edges, the density distribution of Lithiums has quantitatively observed. The technique has been applied to real cells.
We have been developing a powder diffraction data analysis software suite, in which applications for Rietveld analyses, the Maximum Entropy Method, visualization are included.
Various methods using isotopes of 6Li and 7Li have been developed. We have developed a test cell with the two layered cathode where a 6LiMn2O4 layer (electrolyte side) and a 7LiMn2O4 one (current collector side) were stacked. The ratio of 6Li and 7Li were 0.8 before and after low rate charging (20 h), but decreased to 0.7 - 0.8 after high rate charging (1/5 h). This implies inhomogeneous de-intercalation between two layers in high rate charging, whereas homogeneous in low rate charging.
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