چكيده به لاتين
As a result of increasing energy demand, which has led to damaging effects to the environment. Green energy sources have become a growing global attention over the past decade. Lithium-ion batteries have been considered as energy storage devices due to their high energy density and higher charging speed than other energy storage systems. Due to the recent speculation concerning the availability of lithium reserves, which will lead to the increase in the price of lithium by multiple folds in the long term especially for large-scale storage systems, it has become essential to investigate sodium-ion (Na-ion) battery as a promising replacement because of the abundance and wide distribution of sodium resources. The cathode studied in this thesis is a part of NASICON structures which is in the group of poly anionic cathodes and is displayed as Na3V2 (PO4) 3. In this study, by adding CTAB, glycine and citric acid, the cathode materials were synthesized by solution combustion method at a combustion temperature of 350 ° C for 15 minutes. To increase crystallinity heated at 850 ° C for 6 h in argon atmosphere. By examining the microstructure, it was found that with increasing CTAB, the particle size decreased and the specific surface area increased. Also, in the sample with the combination of glycine and CTAB, the optimal amount of glycine with a molar ratio of 0.4 was detected and a porous structure was obtained. The combination of citric acid and CTAB caused the particles to be in the large size range and have no application for research. When charge and discharge tests were taken from different glycine ratios at the 1C rate, the initial discharge capacity for 0.2, 0.4 and 0.8 molar ratios showed 98, 105 and 113 mAhg-1, respectively. When CTAB was used as fuel, discharge capacity was reported at 1C rate in the first cycle for samples 0.2, 0.4 and 0.8 equivalent to 88, 109 and 112 mAhg-1. Also in the samples 0.4 CTAB and 0.4 glycine and 0.8 CTAB at a high 10C rate 96 and 88.7 mAhg-1 capacity were obtained.
