Crystal structure and cathode performance dependence on oxygen content of LiMn1.5Ni0.5O4 as a cathode material for secondary lithium batteries

LiNi0.5Mn1.5O4 Spinel and Its Derivatives as Cathodes for Li-Ion Batteries

“…When annealed at 700 °C in air after a high-temperature calcination at 1000 °C, the resulting powders does not contain Mn 3+ [15]. It was reported that LiNi 0.5 Mn 1.5 O 4 synthesized under O 2 atmosphere has the cubic spinel structure with a space group of P4 3 32 instead of Fd3m [16,17].…”

Low Temperature Synthesis of High Crystalline Spinel Oxides: LiNi_1/2Mn_3/2O₄

“…Diffraction peaks which could be indexed with the spinel structure were observed at 400°C and the formation of the spinel phase proceeded up to 800°C. 4,8,14 The decrease of the peak intensity of the spinel phase and formation of the NiO like rocksalt phase began to occur above 900°C and the rocksalt phase became dominant at 1000°C. During the cooling step, the spinel phase was reformed and the rocksalt phase disappeared after sintering at 700°C for 20 h. Reversible phase transformation from the spinel to the NiO like rocksalt phase above 700°C in air was in good agreement with the previous reports.…”

The Current Situation and Problems of Rechargeable Lithium Ion Batteries

“…Thus, this strategy cannot be applied in all cases, as it depends on the nature of the active materials. LiNi 0.5 Mn 1.5 O 4 possessing a spinel structure has been previously reported as a cathode material that can charge and discharge stably [17]. In this material, the Ni largely contributes to the charge and discharge reactions, while the Mn keeps its Mn 4+ state [18].…”