Effect of reaction temperature on morphology and electrochemical behavior

Abstract

LiCoO 2 and LiMn 2 O 4 compounds were synthesized using two different methods, viz., low-temperatureaided hydrothermal and high-temperature-assisted coprecipitation method. Keeping the reaction parameters such as type of precursors chosen and the medium of reaction as same for both the hydrothermal and co-precipitation methods, the effect of temperature in producing LiCoO 2 and LiMn 2 O 4 with varying physical as well as electrochemical properties has been studied. As expected, the effect of lowtemperature-involved hydrothermal method rendered finer particles of nanocrystalline nature with minimum strain, and the high-temperature synthesis of co-precipitation method produced slightly enhanced particle size with an increased strain value. The effect of size-grown particles resulting from co-precipitation method exhibited inferior electrochemical properties such as increasing resistance of the cell upon cycling and a significant decline in capacity behavior, irrespective of LiCoO 2 or LiMn 2 O 4 cathodes. On the other hand, hydrothermal synthesis of LiCoO 2 and LiMn 2 O 4 has exhibited acceptable specific capacity with an admissible capacity fade behavior and negligible internal resistance of the cell, thus qualifying the same as better-performing cathodes. Hence, the effect of low temperature in producing LiCoO 2 and LiMn 2 O 4 cathodes with facile intercalation and de-intercalation of lithium is demonstrated.

Facile synthesis of LiMn2O4 octahedral nanoparticles as cathode materials for high capacity lithium ion batteries with long cycle life

“…It indicates that cellulose can reduce MnO 2 to Mn 3 O 4 during the process of low temperature combustion reaction (350 C) in the presence of cellulose. For morphology control, various synthetic parameters including the temperature [24], the Mn precursor [25], the fuel [16] are essential to LiMn 2 O 4 . Thus, the change in the LMO1 precursor is one of the most important factors in the formation of octahedral LiMn 2 O 4 .…”

Graphene decorated LiMn2O4 electrode material for hybrid type energy storage devices

“…Figure 1E shows the Fourier transform infrared spectroscopy spectrum for the samples. The asymmetric stretching modes of the MnO 6 group are responsible for high‐intensity bands between 610 and 519 cm −1 33 . As graphene was combined with the LiMn 2 O 4 particles, infrared bands showed redshift.…”

Synthesis, and crystal and electronic structure of sodium metal phosphate for use as a hybrid capacitor in non-aqueous electrolyte

“…9b. Based upon the binding energies reported in the literature, [39][40][41] the C (1s) peaks at 286 eV were assigned to hydrocarbons present in the XPS chamber (taken as charge referencing) and the peak at 282 eV was assigned to carbon present in the maricite material itself, coming from PVP. The peak fitting was done by applying multiple Gaussians.…”