ISSN:
1433-0768
Keywords:
Key words High speed voltammetry
;
Lithium cobalt oxide
;
Manganese substitution
;
Kinetic reversibility
;
Cycle stability
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The microelectrode technique was applied to investigate the electrochemical properties of LiCo1- x Mn x O2 (x=0, 0.01, 0.05, 0.2, or 0.5) synthesized using the citrate process. From the X-ray diffraction measurements, an expansion of the c-axis and a decrease in the crystal size of the materials were observed on substitution of Mn into LiCoO2. In the electrochemical measurements, the high-speed cyclic voltammogram for the Mn-substituted materials gave one set of peaks at 3.9 V vs. Li/Li+. The apparent chemical diffusion constant (D app) of LiCo0.8Mn0.2O2 obtained from the potential step experiment was 6.4 × 10−8 cm2/s, which is larger than that of LiCoO2. The increase in D app is attributable to the expansion of the c-axis and/or the decrease in the crystal size. In addition, the increase in Mn substitution up to 20% lead to an improvement in the kinetic reversibility and the cycle stability of LiCoO2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100080050196
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