Abstract
The spinel LiNi0.5Mn1.5O4 (LNMO) is one of the most promising candidates as a cobalt-free positive electrode material with itstheoretical capacity of 147 mAh.g-1 obtained by oxidation of Ni2+ to Ni4+ at a high potential of 4.7 V vs. Li/Li+, achieving anattractive energy density of 650 Wh/kg. LNMO crystallizes in two different spinel structures with cubic symmetries calleddisordered and ordered phases that are described respectively in Fd-3m and P4332 space groups depending on thearrangement of Ni and Mn atoms [1]. The extent of the transition metal order along with other parameters such as the Ni/Mnstoichiometry and thus Mn3+ content as well as the morphology of the primary particles affect the electrochemical behavior ofthis material [2]. In this study, we prepare the spinel LNMO by molten salt synthesis, where it is possible to control the size andmorphology of the particles [3]. Then we explore the degree of order in materials that had undergone several post-annealingsby combining diffraction, microscopy and spectroscopy techniques