Gopukumar, S. and Jeong, Y. and Kim, K.B. (2003) Synthesis and electrochemical performance of tetravalent doped LiCoO2 in lithium rechargeable cells. Solid State Ionics, 159. pp. 223-232.

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Abstract

Titanium-doped lithium cobalt oxides having the formula LiTixCo1 � xO2 (0VxV0.5) have been synthesized using high temperature solid-state technique and its performance in a lithium rechargeable cell is reported. The synthesized oxides were structurally analyzed using X-ray diffraction (XRD) and Raman spectroscopy. It has been observed that single-phase materials were below 10% of Ti doping whereas impurity spinel phases were detected at higher concentrations. Electrochemical behaviors of the prepared powders were analyzed using cyclic voltammetry (CV) and galvanostatic charge/discharge cycling studies in the voltage range 3.0–4.25 V (vs. Li metal) using 1 M LiClO4/PC as electrolyte. The composition with x = 0.01 exhibits an initial charge and discharge capacity of 157 and 148 mA h/g at 0.2C rate, respectively, as compared to 137 and 134 mA h/g of LiCoO2. Further, more than 90% of the capacity is retained even after 10 cycles. The role of tetravalent doping on the electrochemical behavior of LiCoO2 has not been reported previously.

Item Type:	Article
Uncontrolled Keywords:	Lithium Intercalation; Doping; Electrochemical properties; LiCoO2; Capacity
Subjects:	Lithium batteries
Divisions:	UNSPECIFIED
Depositing User:	ttbdar CECRI
Date Deposited:	05 Apr 2012 11:22
Last Modified:	05 Apr 2012 11:22
URI:	http://cecri.csircentral.net/id/eprint/918

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