NDLI: Anomalous decrease in structural disorder due to charge redistribution in Cr-doped Li4Ti5O12 negative-electrode materials for high-rate Li-ion batteries

Content Provider	Royal Society of Chemistry (RSC)
Author	Kim, Yong-Tae Kim, Min-Gyu Song, Hannah Chung, Kyung Yoon Kim, Hyung Sun Chun, Ho-Hwan Cho, Byung-Won Yun, Su-Won
Copyright Year	2012
Abstract	Since one of the main drawbacks of Li4Ti5O12 as a negative-electrode material is its low electronic conductivity, several researchers have attempted to improve the conductivity by narrowing the band gap through transition-metal doping. Herein, we report another, more significant effect of doping in addition to the band gap narrowing, namely, an anomalous decrease in the structural disorder in Li4Ti5O12 upon Cr3+-ion doping. Although it is generally recognized that doping with heterogeneous elements increases the structural disorder, the Cr3+-ion doping in Li4Ti5O12 demonstrated an unexpected structural phenomenon. From the results of various structural analyses using a synchrotron beam, such anomalous structural changes were revealed to originate from charge redistribution at nearby Ti4+ ions. Finally, the capacity was markedly enhanced, especially at high C-rates (125 mA h g−1 for 10C charge/10C discharge, 145 mA h g−1 for 1C charge/50C discharge) because of both the band gap narrowing and the increased ionic diffusivity due to the decreased structural disorder, but was decreased instead for too-high doping levels.
Starting Page	9903
Ending Page	9913
Page Count	11
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	5
Issue Number	12
Journal	Energy & Environmental Science
DOI	10.1039/c2ee22734g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Band gap Dopant Ion Synchrotron
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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