Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 160, Issue 5, Pages A3036-A3040Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.004305jes
Keywords
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Funding
- National Basic Research Program of China (973 program) [2011CB935903]
- National Natural Science Foundation of China [21233004, 21021002]
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A strategy to improve cyclic performance of 5 V spinel LiNi0.5Mn1.5O4 in a wide voltage region (4.95-2.0 V.) by Ti-doping has been proposed and demonstrated for the first time. The effects of Ti substitution for Mn on the structure and electrochemical properties of the LiNi0.5Mn1.5-xTixO4 (0 <= x <= 0.6) during cycling between 4.95 and 2.0 V were investigated. X-ray diffraction (XRD) results show that all of these materials are cubic spinel structure with a space group of Fd (3) over barm, where their unit cell parameter a increases with the substituting amount of Mn by Ti, which is in agreement with the fact that the ionic radius of Ti4+ (74.5 pm) is much larger than that of Mn4+ (67 pm). Electrochemical test results show that proper amount of Ti substitution for Mn is able to significantly improve the cyclic performance of LiNi0.5Mn1.5-xTixO4 spinel during cycling at 4.95-2.0 V, especially for the capacity retention of the ca. 2.7 V plateau. Take LiNi0.5Mn1.0Ti0.5O4 as an example, the capacity retention in the upper (4.95-3.0 V) and lower voltage (3.0-2.5 V) regions after 100 cycles are 57.1% and 79.8%, respectively, while they are only 47.0% and 24.5% for un-substituted LiNi0.5Mn1.5O4 sample, respectively. (C) 2013 The Electrochemical Society.
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