چكيده به لاتين
Following the development of societies, human beings have always been looking for new ways to supply the energy they need.Fossil fuels are known as the first choice in supplying energy to humans, which is criticized for producing combustion gases and intensifying the phenomenon of global warming.Secondary batteries are one of the advances of the communities used to store the required energy, and among these batteries, lithium-ion batteries are remarkable due to their unique properties. An important part of lithium-ion batteries is the anodic material. Among the materials used as anodic material, iron oxides due to high theoretical capacity (1005 mAh.g-1for Fe2O3 and 972 mAh.g-1 for Fe3O4), non-toxic, corrosion resistance, abundance, Inexpensive and environmentally friendly have been considered.So far, different methods have been used to synthesize iron oxide nanoparticles, including co-precipitation, hydrothermal and solution combustion synthesis methods.Meanwhile, the use of solution combustion method based on exothermic reaction can be considered for the synthesis of nanostructured metals, alloys, oxides, sulfides, etc. due to the simplicity and adaptability of the method and also the high efficiency of products. Factors affecting the improvement of product characteristics obtained from the process of solution combustion synthesis include: type of raw materials, fuel, additives and type of synthesis in open environment (with the presence of air oxygen) and synthesis in the closed environment (without the presence of air oxygen).In this study, different glycine, urea and citric acid fuels with the addition of RGO were used to investigate the morphology and electrochemical performance of iron oxide.Using RGO, we improved the stability and conductivity, and the porosity in the iron oxide structure was controlled using the type of fuel and the ratio of fuel to oxidizer (φ = 1).Specific capacity for citric acid-synthesized materials was better than for glycine and urea-synthesized samples. Also, the synthesis of iron oxide/graphene composite in the open environment has shown better performance than the synthesis in the closed environment.As a result, in the voltage range of 0/01-3 volts, the sample synthesized in the open environment with citric acid fuel by adding %30 RGO after 50 cycles, discharge capacity of 1072/89 and Coulomb efficiency of %99.02 in mAhg-1 current density 50 has shown itself.
