LiMn1.8Ni0.2O4 nanorods obtained from a novel route using α-MnOOH precursor as cathode material for lithium-ion batteries

Cobalt-Free Oxide Cathode Material with Phase Composition Control to High Electrochemical Performance in Li-Ion Batteries

“…This situation affects the average M-M inter-slab distance and, consequently, the Li ion diffusivity could be diminished. 46 In the current work, the nano α-MnOOH precursor promotes the formation of polyhedron particles during thermal treatment, as was also reported by Zaho et al 22 Additionally, the synthesis conditions such as the high temperature, oxalic environment, 23 and the properties of the α-MnOOH template promote the formation of two kinds of particles, with a greater amount of Mn in polyhedron particle and greater amount of Ni in irregular fine particles. Consequently, the conditions explained above induce the formation of monoclinic and rhombohedral phases.…”

“…However, the α-MnO 2 phase affects the grain size distribution of the lithiated phase due to its low crystallinity. 31 In the case of α-MnOOH, the same behavior can be achieved due to its high decomposition temperature, as was shown by Vásquez et al 23 The α-MnOOH precursor compound used in the current work was constituted of several smaller rods (see Fig. S1, in the supporting information) with an average width of 102.34 ± 27 nm and an average rod length of 2141.52 ± 83 nm.…”

“…The solution was transferred into a pre-heated stainless-steel autoclave with internal Teflon ® vessel and heated at 140 °C for 18 h. After cooling to room temperature, the precipitate was washed with distilled water and ethanol (50:50 v/v), centrifuging six times at 6000 rpm for 5 min. Finally, the product was dried under vacuum at 90 °C 24 h. 23 Once the α-MnOOH nanorods were obtained, the lithium and nickel were incorporated by co-precipitation method. In this stage, stoichiometric mixtures of α-MnOOH phase with lithium acetate and nickel acetate with a molar ratio of 0.5:1.05:0.5 mol were prepared in 7.8 ml of distilled water.…”

Recent Progress in High-Voltage Cathode Materials for Lithium-Ion Batteries

“…On the one hand, the performance depends on the type of precursors, used binder, different conductive agents, and on the other hand are a factor of the calcination and cooling temperature, chosen synthesis method, milling, used electrolyte, etc. (1)(2)(3)(4)(5)(6)(7). Recently, a "small" but important change in the design of a battery improved its performance up to 6 times; it means that the range of the EVs was extended by 16 %.…”