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 decades. Lithium-ion batteries have been considered as energy storage systems. Lithium-ion batteries (LIB) is widely used in portable electronic device, for instance cell phone & cameras due to high energy density, high woking voltage & long cycle life.The electrochemical properties of LIBs depend on cathode materials. Among various cathode materials, the LiFePO4 as used good cathodes with high charge capacity in lithioum-ion batteries. On the other hand, cathodic material LiFePO4 have defects such as Low electrical conductivity & Low diffusion rate of lithium ion. Often,To solve this problem reduce particle size or coating the surface with conductive particles. Among the various synthesis methods used for LiFePO4 so far, can metioned Sol-gel, Solid state reaction, Hydrothermal, Mechanical alloying, Co-precipitation & 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, oxids, sulfides, etc. due to the simplicity & versatility of the method as well as the high yiels of the products. In this study, different fuels such as CTAB, mixture of CTAB & glycine, mixture of CTAB & citric acid & mixture of CTAB & urea with different fuel ratios were used for combustion synthesis of LiFePO4 with 10% by weight of sucrose & all samples at 700 ° C. They were calcined for 3 hours & the microstructures and electrochemical properties of the batteries obtained from the synthesized powders were investigated.
