Synthesis by molten salt and cathodic properties of Li (Ni1/3Co1/3Mn1/3 )O2

The mixed oxide, Li(Ni1/3Co1/3Mn1/3)O2, with the layer structure has been prepared by a one-pot method using the molten-salt mixture, LiNO3-LiCl at temperatures 750, 850 and 950 deg C in air. The compounds were characterized by a variety of techniques. As per Rietveld data, only 4.0 and 2.5% of ...

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Bibliographic Details
Published in:Journal of power sources 2006-09, Vol.159 (1), p.263-267
Main Authors: REDDY, M. V, SUBBA RAO, G. V, CHOWDARI, B. V. R
Format: Article
Language:English
Subjects:
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
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Summary:The mixed oxide, Li(Ni1/3Co1/3Mn1/3)O2, with the layer structure has been prepared by a one-pot method using the molten-salt mixture, LiNO3-LiCl at temperatures 750, 850 and 950 deg C in air. The compounds were characterized by a variety of techniques. As per Rietveld data, only 4.0 and 2.5% of 'cation-mixing' was observed in the compounds prepared at 850 and 950 deg C, respectively. Cyclic voltammetry with Li metal as counter electrode showed a clear indication of Ni2+/4+ redox couple at 3.6-3.9V in all compounds. Charge-discharge cycling was carried out in the range 2.5-4.3, 2.5-4.4 and 2.5-4.5V versus Li at a current rate of 20 or 30mAg-1. The fifth cycle discharge capacities varied from 125 to 145 (+/-5)mAhg-1 for the compounds prepared at 850 and 950 deg C. They exhibited excellent capacity-retention without noticeable capacity-fade till 50 cycles irrespective of the voltage cut-off.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2006.04.134