Zou, M. and Yoshio, M. and Gopukumar, S. and Yamaki, J.I. (2004) Synthesis and Electrochemical Performance of High Voltage Cycling LiM0.05Co0.95O2 as Cathode Material for Lithium Rechargeable Cells. Electrochemical and Solid-State Letters, 7. A176-A179. ISSN 1099-0062

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Abstract

Substituted cobalt oxides, LiM0.05Co0.95O2 (M 5 Mg21, Al31, and Ti41), have been synthesized using solid-state technique and their performance in a 2032-type lithium rechargeable coin cell is reported. The synthesized powders were structurally analyzed using X-ray diffraction ~XRD! and the surface morphology evaluated with scanning electron microscopy. XRD patterns indicate that single-phase materials were formed involving Al-doped LiCoO2 . Electrochemical studies were carried out in the voltage range 3.5-4.5 V ~vs. Li metal! using 1 M LiPF6 in ethylene carbonate/dimethyl carbonate as electrolyte. The doping involving 5% Mg resulted in a charge/discharge capacity of ;160 mAh/g at C/5 rate and remained stable even after 50 cycles. To the best of our knowledge, this is the first time that such high stable capacities have been obtained involving doped LiCoO2 when cycled up to 4.5 V.

Item Type:	Article
Subjects:	Lithium batteries Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	25 Feb 2012 11:22
Last Modified:	25 Feb 2012 11:22
URI:	http://cecri.csircentral.net/id/eprint/932

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