373819 Stabilization of Oxygen-Deficient Structure for Conducting Li4Ti5O12-d By Molybdenum Doping in a Reducing Atmosphere

Monday, November 17, 2014
Galleria Exhibit Hall (Hilton Atlanta)
DS Yu, Energy System, Pusan National University, Busan, South Korea

Li4Ti5O12(LTO) is recognized as being one of the most promising anode materials for high power Li ion batteries; however, its insulating nature is a major drawback. In recent years, a simple thermal treatment carried out in a reducing atmosphere has been shown to generate oxygen vacancies (Vo) for increasing the electronic conductivity of this material. Such structural defects, however, lead to re-oxidization over time, causing serious deterioration in anode performance. Herein, we report a unique approach to increasing the electronic conductivity with simultaneous improvement in structural stability. Doping of LTO with Mo in a reducing atmosphere resulted in extra charges at Ti sites caused by charge compensation by the homogeneously distributed Mo6+ ions, being delocalized over the entire lattice, with fewer oxygen vacancies (Vo) generated. Using this simple method, a marked increase in electronic conductivity was achieved, in addition to an extremely high rate capability, with no performance deterioration over time.

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