Abstract
LiNi 0.5− y M y Mn 1.5O 4 compounds have proven to be of great interest as active cathode material for high-voltage lithium-ion cells. The electrochemical behavior of LiNi 0.5− y Fe y Mn 1.5O 4 compounds as cathode material in lithium cells is studied here. The charge–discharge curves are characterized by three main plateaus, ascribable to the removal (during charge) or filling (during discharge) of d electrons corresponding to the different redox pairs present: Fe IV/Fe III, Ni IV/Ni II and Mn IV/Mn III. Taking into account the entropy associated to the lithium extraction/insertion and the filling of the different electronic levels, the modelization gives a good reproducibility of the experimental electrochemical curves. The standard potential μ 0 of the redox pairs were estimated to be ca. −4.90, −4.80 and −4.23 eV, respectively.
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