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Issue 26, 2012
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Revisiting the layered LiNi0.4Mn0.4Co0.2O2: a magnetic approach

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Abstract

Layered LiNi0.4Mn0.4Co0.2O2 has been synthesized by the co-precipitation method, and the structural, electrochemical and magnetic properties were comprehensively studied by Rietveld analysis, charge–discharge potential profiles, X-ray photoelectron spectroscopy, and dc and ac susceptibilities. The material shows initial discharge capacities of 166 and 206 mA h g−1 in potential windows of 2.5–4.4 V and 2.5–4.6 V, respectively, and a better capacity retention of 95% at 2.5–4.4 V after 50 cycles. The effective paramagnetic moment is calculated to be 3.02(3) μB/f.u. by fitting to the Curie–Weiss law, which is consistent with the averaged value, based on the specific contributions, as quantified by an analysis of the X-ray photoelectron spectroscopy data. The dc magnetization curves show irreversibility and spin freezing behavior at 77 K and 18 K, respectively. The evolution of irreversibility temperature under different applied fields indicates a spin-glass-like transition. The ac susceptibility data and the fitting using the frequency dependent spin-freezing temperatures also confirm this magnetic transition. In comparison with the previous results, the co-precipitation prepared sample shows a big difference in the magnetic parameters, coming from the different microscopic exchange interactions or the formation of a different scale of spin clusters, which is sensitive to the preparation procedure.

Graphical abstract: Revisiting the layered LiNi0.4Mn0.4Co0.2O2: a magnetic approach

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Publication details

The article was received on 19 Jun 2012, accepted on 20 Aug 2012 and first published on 22 Aug 2012


Article type: Paper
DOI: 10.1039/C2RA21670A
Citation: RSC Adv., 2012,2, 9986-9992
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    Revisiting the layered LiNi0.4Mn0.4Co0.2O2: a magnetic approach

    X. Bie, L. Liu, H. Ehrenberg, Y. Wei, K. Nikolowski, C. Wang, Y. Ueda, H. Chen, G. Chen and F. Du, RSC Adv., 2012, 2, 9986
    DOI: 10.1039/C2RA21670A

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