Bhuvaneswari, D. and Gangulibabu, . and Kalaiselvi, N. (2013) Effect of surface modifiers in improving the electrochemical behavior of LiNi0.4Mn0.4Co0.2O2 cathode. Electrochimica Acta, 109. pp. 684-693. ISSN 0013-4686

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Abstract

Surface modification of LiNi0.4Mn0.4Co0.2O2 (4 4 2) compound with certain metal oxides viz., Al2O3, Bi2O3 and In2O3 has been attempted with a view to improve the structural and cycling stability, especially upon high voltage and high rate cycling conditions. In addition to HF scavenging effect, the protective metal oxide inter-connect layer restricts the number of oxide ion vacancies eliminated during the initial cycling of cathode, resulting in the reduced irreversible capacity loss of the first cycle. Among the surface modified cathodes, Bi2O3 coated LiNi0.4Mn0.4Co0.2O2 cathode exhibits appreciable specific capacity values of 196 mAh g−1 (Qdc1) and 175 mAh g−1 (Qdc100) with 89% capacity retention, thus evidencing the superiority of Bi2O3 modifier in improving the electrochemical behavior of pristine LiNi0.4Mn0.4Co0.2O2 cathode. Further, suitability of Bi2O3 coated LiNi0.4Mn0.4Co0.2O2 cathode for high voltage (5.0 V) and high rate (3 C) lithium intercalation and de-intercalation applications has been demonstrated up to 100 cycles. Based on the extent of improvement in electrochemical behavior, the cathodes under investigation could be arranged in the order: Bi2O3 coated > Al2O3 coated > In2O3 coated > uncoated LiNi0.4Mn0.4Co0.2O2 oxide.

Item Type:	Article
Uncontrolled Keywords:	Surface modification, Irreversible capacity loss, Rate capability, Extended potential window, Lithium batteries
Subjects:	Lithium batteries Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	Dr. N Meyyappan
Date Deposited:	30 Dec 2013 13:34
Last Modified:	30 Dec 2013 13:34
URI:	http://cecri.csircentral.net/id/eprint/3057

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