Relaxation Analysis of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> 5 V Cathode Material by Means of the Rietveld Refinement

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  • Relaxation Analysis of LiNi₀.₅Mn₁.₅O₄ 5V Cathode Material by Means of the Rietveld Refinement

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Abstract

<p>After electrochemically extracting lithium ions from LiNi0.5Mn1.5O4, we have investigated the structural variation during the relaxation process by means of X-ray diffraction coupled with the Rietveld analysis, assuming Li-rich and Li-lean spinel phases with <img align="middle" src="./Graphics/abst-16-E00042.png"/> symmetry coexistence. For both x = 0.1 and 0.2 of LixNi0.5Mn1.5O4, mole fraction of Li-lean phase decreases with the relaxation time, although any apparent change in lattice parameter does not occur for both phases. This indicates that Li-lean phase with larger oxygen tetrahedron size, presumably favorable for lithium diffusion, is formed with excess amount during the lithium extraction, and then it transforms into Li-rich and Li-lean phases with smaller lithium concentration during the relaxation process. Slight increase in the size of oxygen tetrahedron and decrease in that of octahedron during relaxation for Li-lean phase of x = 0.1 are also consistent with above phase change.</p>

Journal

  • Electrochemistry

    Electrochemistry 84 (10), 808-811, 2016

    The Electrochemical Society of Japan

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