| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Outline of Final Research Achievements |
We have found that the electrochemical activity of Li2MnO3 as a positive electrode for Li-ion secondary batteries is much improved by CuO coexisting, and clarified the mechanism of the improvement. The general way to induce the activity is to substitute Mn for Co or Ni. However, this research introduced a new way to exhibit high electrochemical activity by CuO which has rich in mineral resources. Our investigations showed that CuO made the particles of Li2MnO3 fine and disordering of Li in the crystal structure of Li2MnO3 occurred according to CuO content. By use of in-situ GC-MS measurement we succeeded in detecting of oxygen generation from Li2MnO3 caused by electrochemical oxidation. Both experimental and calculating investigations suggest that oxygen along with transition metals could participate in electrochemical oxidation and reduction, and a new potential of Li2MnO3 and copper oxides as positive electrode for Li-ion secondary batteries.
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