拉曼光谱
尖晶石
材料科学
八面体
化学计量学
中子衍射
学位(音乐)
结晶学
化学物理
晶体结构
物理化学
化学
物理
声学
光学
冶金
作者
Gozde Oney,Jon Serrano Sevillano,Mouna Ben Yahia,Jacob Olchowka,Emmanuelle Suard,François Weill,Arnaud Demortière,Montse Casas‐Cabanas,Laurence Croguennec,Dany Carlier
标识
DOI:10.1016/j.ensm.2024.103486
摘要
The performance of the high voltage spinel LiNi0.5Mn1.5O4 (LNMO) in Li-ion batteries strongly depends on its synthesis conditions, actual Ni/Mn stoichiometry, and degree of ordering of Ni and Mn. Depending on the extent of this ordering, the spinel structure can be described in the conventional space group Fd3¯m as the non-substituted LiMn2O4 or, for the highly ordered phase, in the space group P4332. As previously reported in the literature, using neutron and electron diffraction, a qualitative description of the extent of ordering can be achieved and roughly related to the electrochemical performance of LNMO. To deeper characterize and understand this complex system, in this paper, we will show that Raman spectroscopy, and especially the characteristics of the band located at 160 cm−1 attributed for the first time to a twisting motion of octahedral entities, allow to estimate the degree of ordering in LNMO, whereas NMR spectroscopy allows to give a clear description of the local environments of Li, in relationship with the Ni/Mn stoichiometry and extent of ordering. Theoretical calculations were used to support the analysis and attribution of the Raman and NMR signals/spectra. These spectroscopic characterizations enabled in-depth insights into the complexity of LNMO in stoichiometry, degree of ordering, and purity versus the presence of rock-salt or layered oxides as defects or crystalline domains.
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