成果報告書詳細
管理番号20130000000481
タイトル*平成24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 (8)
公開日2014/2/21
報告書年度2012 - 2012
委託先名国立大学法人東京工業大学
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The present study focused on the following subjects; (A) reaction control of layered rocksalt materials using an extreme condition for the developments of new electrode materials for lithium batteries with high power and long calendar life, (B) development of new structural analysis methods using neutron/synchrotron X-ray sources. (A) New layered materials with lithium rich compositions of Li1+xMnaCobNicO2 were synthesized by a high pressure synthesis under an oxidant atmosphere. Diffraction peaks of Li1+xMnaCobNicO2 synthesized were indexed using the space group C2/m, indicating a lithium excess layered rock-salt structure. New Li1+xMnaCobNicO2 synthesized under 2 GPa showed the highest capacity of 230 mAh/g which was larger than that of Li1+xMnaCobNicO2 synthesized by stichiometric composition. Charge-discharge mesurements using the Li1+xMnaCobNicO2 cathodes demonstrated no significant voltage fading which is perceived to be one of the critial difficulties with the lithium excess layered materials. These results confirmed that the control of the oxygen partial pressure and the high pressure condition was a powerful tool for developing lithium excess layered compounds. (B) This research has been done in collaboration with Titech, Kyoto Univ., and KEK. Crystal structure changes of cathode and anode materials in a commercialized cylindrical cell were successfully detected using new neutron diffractometor, SPICA, which was developing at BL09 in J-PARC. Tutorial for the powder neutron Rietveld refinement was prepared for the structural refinement of the electrodes of lithium secondary batteries.
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