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http://dx.doi.org/10.5229/JKES.2011.14.1.033

Analyses on Fine Structure and Electronic Structure of Cr-doped Li4Ti5O12 by Using X-ray Absorption Spectroscopy and First Principle Calculation  

Song, Han-Nah (Division of Energy Systems, School of Mechanical Engineering, Pusan National University)
Kim, Hyung-Sun (Advanced Battery Center, Korea Institute of Science & Technology)
Cho, Byung-Won (Advanced Battery Center, Korea Institute of Science & Technology)
Kim, Yong-Tae (Division of Energy Systems, School of Mechanical Engineering, Pusan National University)
Publication Information
Journal of the Korean Electrochemical Society / v.14, no.1, 2011 , pp. 33-37 More about this Journal
Abstract
$Li_4Ti_5O_{12}$ has been considered a potential material for high power lithium batteries. Since $Li_4Ti_5O_{12}$ is however an insulator having a broad band gap, various methods have been employed to improve the conductivity. In this study, we have investigated the change of fine structure and electronic structure by Cr doping using X-ray absorption spectroscopy and First Principle Calculation. Doping with Cr, we could obtain an enhanced electronic conductivity by locating the Fermi level at the center position of Cr d-band and identify the change of XANES pre-edge and white line peak due to the increase of electron density of Ti d-band.
Keywords
Lithium secondary batteries; $Li_4Ti_5O_{12}$; Anode; XANES; EXAFS; LDOS;
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