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With the accelerating pace of electric bicycles and the development of new energy automotive industry , energy storage technology quickly by more and more attention , the green energy industry requirements and the attention of the lithium-ion battery has reached the highest point in history . The lithium -ion battery power supply has become the most promising . Among them, the performance of the cathode materials for lithium-ion batteries has played a key role. Lithium iron phosphate olivine structure because of its low price , non-toxic , high theoretical specific capacity , excellent thermal stability and smooth release point platform , etc. , become the great potential of the lithium-ion battery cathode material become in recent years hotspot of research and development . The paper first summarizes some of the basic characteristics of the lithium -ion battery and works by analyzing a number of problems in the synthesis of lithium iron phosphate process , a direct atmospheric pressure and low temperature liquid environment, rapid synthesis of grains small diameter , uniform , and a new method for the lithium iron phosphate having an olivine structure . With dimethylsulfoxide / water solution as the reaction medium , under atmospheric pressure and low temperature conditions , after a short reaction time can be directly prepared by small particle size and uniform distribution of a single -phase olivinic structure , lithium iron phosphate. Sintering, the liquid phase obtained directly mix a small amount of lithium iron phosphate of glucose at a high temperature for a short time can be obtained and excellent electrochemical performance LiFePO 4 / C . This article using scanning electron microscopy ( SEM ) , X - ray diffraction ( XRD ) , transmission electron microscopy ( TEM ) and infrared spectroscopy ( IR ) , electrical performance testing of the sample morphology , particle size and crystal structure, electrochemical performance, etc. were characterized by different concentration of reactants , reaction time, ratio of the solvent of dimethylsulfoxide with water , sintering time , sintering temperature , under conditions of the synthesized samples were compared , and draw the the prepared of LiFePO 4 < / sub> / C materials optimized conditions . And liquid phase method directly obtained the LiFePO 4 and under optimal conditions obtained LiFePO 4 / C compared and analyzed , indicating a certain amount of carbon-coated a short heat treatment is very important for the improved performance of the lithium iron phosphate chemistry .
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