Abstract
A number of spinel phases with a general formula LiMn2−y Me y O (Me = Cr, Co, Ni) was synthesized using the melt-impregnation and sol-gel methods. All synthesized materials were subjected to electrochemical testing of their suitability as cathodes in lithium-ion batteries. Cyclic voltammograms were used in the testing. The cathode materials prepared using the melt-impregnation method showed the highest initial discharge capacity (up to 120 mA h/g) and stable operation during the cycling. The partial substitution of chromium and cobalt atoms for manganese gives positive effect: the spinel structure is stabilized during the cycling. The double doping of the Li-Mn-O system with small amounts of Co and Ni results in the stabilizing of the discharge capacity. An overstoichiometry excess of lithium in Co- or Cr-doped spinels also favors the increasing of the discharge capacity and slows down its decaying during the cycling.
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Original Russian Text © A.V. Churikov, E.I. Kachibaya, V.O. Sycheva, I.A. Ivanishcheva, R.I. Imnadze, T.V. Paikidze, A.V. Ivanishchev, 2009, published in Elektrokhimiya, 2009, Vol. 45, No. 2, pp. 185–192.
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Churikov, A.V., Kachibaya, E.I., Sycheva, V.O. et al. Electrochemical properties of LiMn2−y Me y O4 (Me = Cr, Co, Ni) spinels as cathodic materials for lithium-ion batteries. Russ J Electrochem 45, 175–182 (2009). https://doi.org/10.1134/S1023193509020086
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DOI: https://doi.org/10.1134/S1023193509020086