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Title: Effect of Cr dopant on the cathodic behavior of LiCoO2
Authors: Madhavi, S.
Subba Rao, G.V. 
Chowdari, B.V.R. 
Li, S.F.Y. 
Keywords: Cathodes
Lithium ion batteries
Issue Date: 11-Dec-2002
Citation: Madhavi, S., Subba Rao, G.V., Chowdari, B.V.R., Li, S.F.Y. (2002-12-11). Effect of Cr dopant on the cathodic behavior of LiCoO2. Electrochimica Acta 48 (3) : 219-226. ScholarBank@NUS Repository.
Abstract: Compounds of the formula LiCo1-yCryO2 (0.0≤y≤0.20 and y=1.0) have been synthesized by high temperature solid-state reaction and were characterized by XRD and FT-IR. Hexagonal a and c lattice parameters increase with increasing y as expected from ionic size effects. Cyclic voltammograms reveal that the phase transformation occurring at x=0.5 in Li1-x(Co1-yCry)O2 is suppressed for y=0.05 and 0.10. Low-current (0.01 C; 1 C=140 mA g-1) galvanostatic charging curves show that the deintercalation voltage for y=0.05 and 0.10 decrease for a given x as compared to LiCoO2. Galvanostatic charge-discharge cycling of the Li(Co1-yCry)O2 cathodes at 0.14 C and 2.7-4.3 V (vs. Li) show that increasing amount of chromium content in the LiCoO2 lattice drastically reduces the amount of Li that can be reversibly cycled. Ex-situ XRD of the cycled cathodes show that slight cation-mixing occurs in the layered structure for y=0.05 and 0.10 and could be the reason for their poor electrochemical performance. Reversible Li intercalation/deintercalation is not possible in LiCrO2 in the voltage range 2.7-4.3 V. © 2002 Published by Elsevier Science Ltd.
Source Title: Electrochimica Acta
ISSN: 00134686
DOI: 10.1016/S0013-4686(02)00594-7
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