Stabilization of Oxygen-deficient Structure for Conducting Li4Ti5O12-δ by Molybdenum Doping in a Reducing Atmosphere

Title
Stabilization of Oxygen-deficient Structure for Conducting Li4Ti5O12-δ by Molybdenum Doping in a Reducing Atmosphere
Authors
송한나정태경문영훈전호환정경윤김형선조병원김용태
Keywords
Li4Ti5O12; oxygen-deficient structure; cathode; lithium ion batteries
Issue Date
2014-03
Publisher
Scientific Reports
Citation
VOL 4, 4350-1-4350-8
Abstract
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 Mo61 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.
URI
http://pubs.kist.re.kr/handle/201004/47366
ISSN
20452322
Appears in Collections:
KIST Publication > Article
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