Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 10, Issue 7, Pages 1031-1034Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2008.05.004
Keywords
lithium-ion batteries; spinel; Li4Ti5O4; lithium-rich framework; electronic conductivity; lithium-ion conductivity
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The effect of Li doping in spinel Li4+xTi5-xO12 (0 <= x <= 0.2) materials on the structural and electrochemical properties were investigated. The ratio of the capacity in the voltage plateau (1.5 V) to the overall discharge capacity for Li4.1Ti4.9O12 (x = 0.1) and Li4.2Ti4.8O12 (x = 0.2) were higher than that of LiJi5012 especially at high current rates due to their enhanced lithium-ion and electronic conductivity by the substitution of Ti atoms by Li atoms. With the increasing of Li doping amount, lithium-ion and electronic conductivity of Li4+xTi5-xO12 increased, however its cycling stability was depressed when the Li doping was of x = 0.2. The Li doping of x = 0.1, the appropriate Li doping amount, showed improved rate capability and better high rate performance comparing to uncloped Li4+xTi5-xO12 (x = 0). (c) 2008 Elsevier B.V. All rights reserved.
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