Abstract
We have investigated LiNi1 − x − y Co x Mn y O2 (x = y = 0.1, 0.2, 0.33) cathode materials synthesized from mechanically activated mixtures of lithium hydroxide and nickel cobalt manganese hydroxide. The materials have a layered structure (sp. gr. \(R\bar 3m\)). Their unit-cell volume and the degree of disordering in their structure decrease with decreasing nickel content. According to x-ray photoelectron spectroscopy data, the major states of the transition-metal ions in the surface layer of the materials are Ni2+, Co3+, and Mn4+. With increasing nickel content, the Ni 2p 3/2 and Co 2p 3/2 binding energies increase, attesting to changes in M-O bond covalence. The highest specific electrochemical capacity, ∼170 mA h/g, is offered by LiNi0.6Co0.2Mn0.2O2. The position of redox peaks in the differential capacity curves of the three materials depends on composition: with increasing nickel content, the peaks shift to lower voltages.
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Original Russian Text © N.V. Kosova, E.T. Devyatkina, V.V. Kaichev, 2007, published in Neorganicheskie Materialy, 2007, Vol. 43, No. 2, pp. 227–235.
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Kosova, N.V., Devyatkina, E.T. & Kaichev, V.V. LiNi1 − x − y Co x Mn y O2 (x = y = 0.1, 0.2, 0.33) cathode materials prepared using mechanical activation: Structure, state of ions, and electrochemical performance. Inorg Mater 43, 185–193 (2007). https://doi.org/10.1134/S0020168507020161
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DOI: https://doi.org/10.1134/S0020168507020161