چكيده به لاتين
Looking for communities’ development human beings have always been looking for new ways to supply their energy. Fossil fuels are considered as the first choice in providing human energy that is criticized for burning greenhouse gas emissions and exacerbating the phenomenon of global warming. Secondary batteries are one of the major advances made by communities to save energy, including lithium-ion batteries due to their unique properties. One of the key determinants of this type of battery is its cathode material. The LiMn1.5Ni0.5O4. Is Among the many materials that are introduced for use as cathode material. So far, different methods have been used to synthesis component LiMn1.5Ni0.5O4 nanoparticles, including solid state, sedimentation, hydrothermal and solution combustion synthesis. In the meantime, the use of a thermally soluble solution combustion method can be considered for the synthesis of nanostructured metals, alloys, oxides, sulfides, etc. due to the simplicity and versatility of the method as well as the high yields of the products. In this study, for the first time, CTAB as fuel, the mixture of glycine and CTAB and the mixture of citric acid and CTAB with different fuel ratios of 0.5, 1, 2 and 3 were used for solution combustion synthesis of LiMn1.5Ni0.5O4, and after reviewing the resulting microstructures, The electrochemical properties of the batteries obtained from synthesized powders have been investigated. It has been observed that in all states, with increasing fuel ratio, the particle size has also increased, and the special surface area has decreased, as well as by generally increasing the fuel ratio, crystallite size and the lattice parameter has also been increased, which would reduces battery capacity. Finally, in the case of using CTAB alone, the best discharge capacity at a charge and discharge rate of 0.1 C is equal to 128 mAh /g, as well as the stability of the capacity after 30 cycles at rate of 1 C of 98% is related to the powders which have been synthesised by fuel ratio of 0.5%. In the case of using mixture of glycine and CTAB, the best discharge capacity at a charge and discharge rate of 0.1 C is equal to 125 mAh /g, and the stability of the capacity after 30 cycles at 1 C rate of 96% is related to the powders which have been synthesised by fuel ratio of 1. The impedance in all modes and for all fuel ratios was in kilo ohms region and increased by increasing the fuel ratio. In the case of using the mixture of citric acid and CTAB fuels, the batteries with a fuel ratio of 0.5 have shown a very good stability of 94% of their initial capacity after 100 cycles.
