文章基本信息

标题：Stabilization of Oxygen-deficient Structure for Conducting Li₄Ti₅O_12-δ by Molybdenum Doping in a Reducing Atmosphere
本地全文：下载
作者：Hannah Song ; Tae-Gyung Jeong ; Young Hoon Moon 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep04350
出版社：Springer Nature
摘要：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 ( V_O ) 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 ( V_O ) 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.