Thermally Induced Structural Reordering in Li- and Mn-Rich Layered Oxide Li Ion Cathode Materials

Thu, 20 Feb 2020 12:56:37 +0100
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In this article published in Chemistry of Materials the authors describe a gradual transformation from a trigonal layered structure toward a cubic spinel structure during electrochemical cycling results in an unwanted decay of the mean charge and discharge voltages, called "voltage fade”. A structural reordering was induced by a mild thermal treatment in lithiated as well as in delithiated electrodes, which results either in a partial recovery of the initial well-ordered state or in an intensification of the structural degradation toward a spinel-type cation ordering, respectively.