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Title: Synthesis and Cathodic Properties of LiCo1-yRhyO2 (0 ≤ y ≤ 0.2) and LiRhO2
Authors: Madhavi, S.
Subba Rao, G.V.
Chowdari, B.V.R. 
Li, S.F.Y. 
Issue Date: Nov-2001
Citation: Madhavi, S., Subba Rao, G.V., Chowdari, B.V.R., Li, S.F.Y. (2001-11). Synthesis and Cathodic Properties of LiCo1-yRhyO2 (0 ≤ y ≤ 0.2) and LiRhO2. Journal of the Electrochemical Society 148 (11) : A1279-A1286. ScholarBank@NUS Repository.
Abstract: Compounds of the formula LiCo1-yRhyO2 (0.0 ≤ y ≤ 0.20 and y = 1.0) have been synthesized by high temperature solid-state reaction and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy, and infrared spectroscopy. Single-phase materials were obtained for y ≤ 0.10 and y = 1.0 as observed by XRD. However, IR and electrochemical data indicate that the true solid solubility may be y ≤ 0.05. Their cathodic behavior in coin cells with Li metal as anode and a liquid electrolyte has been examined. Cyclic voltammograms and galvanostatic charge/discharge curves show that for y = 0.05, the phase transformation occurring at x = 0.5 in Li1-xCoO2 is suppressed and the deintercalation voltage is decreased. The compositions with y = 0.05 and 0.10 show improved cathodic behavior and discharge capacity retention compared to LiCoO2 (y = 0) at 0.14C rate in the voltage range 2.7-4.3 V up to 18 cycles. Electrochemical studies on LiRhO2 show that phase transitions occur on charge/ discharge cycling (varying x in Li1-xRhO2) in the voltage window 3.2-3.7 V and these are reversible. This compound shows an initial charge capacity of 162 mAh/g when charged to 4.0 V (vs. Li metal), corresponding to x = 0.85 in Li1-xRhO2. After an initial loss of 40 mAh/g in capacity, the discharge capacity retention corresponds to 90% after 18 cycles with respect to the initial discharge capacity in the voltage window, 2.7-4.0 V. © 2001 The Electrochemical Society. All rights reserved.
Source Title: Journal of the Electrochemical Society
ISSN: 00134651
DOI: 10.1149/1.1410968
Appears in Collections:Staff Publications

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