Studies On Recovery And Synthetic Of Anode Materials LiFePO₄for Waste Lithium Ion Battery

With the rapid advance of science and technology, the pollution problem between the social energy and environment ecological is becoming increasingly conspicuously, the pollution problem of environment ecological by various batteries has increasingly into social concern of focus. The resolve of battery’s pollution problems must be put forward higher request. Seek science processing method of technically feasible, economically desirable is time request. On the basis of reviewed the detailed lithium ion battery and its research progress of positive materials, this paper Select peridot structure of LiFePO4as the research and study the recycleof the waste positive materials LiFePO4andits synthetic methods.During the experiment, shreding machinery was used to shattere the positive materials to pieces, different polarity organic solvent and nonpolar solvent was used to resolve the positive materials, discussed the dissolving effect of the different organic solvent and its dosage to the positive material, to make sure which one is the best organic solvent and its dosage, The analysis results is that100℃,1g positive materials:5mlNMP,60min is the best condition,the positive materials and thoroughly separated, aluminum foil metal recoveried directly.After filtered, coating powder materials can be separated to electrode materials and conductive material mixture.In composition analysis, the content of iron and phosphorus is determined by chemical titration, while the content of lithium elements is determined by spectrophotometric method. The analysis s is that the carbon content is33.685%, phosphorus is17.82%, iron content is29.02%, and lithium ion content is4.66%.The results are consistent with the EDS results.The experiment take recycled material as raw material, synthesis LiFePO4by ball-milling and solid-state reaction. The ratio of the Li, Fe, P、time of ball-milling, heat and time of calcine were studied as the factor of the synthetic material to the material structure. The structure of the synthetic materials was analyzed by XRD and SEM, The results indicated that the highest capacity of carbon package lithium iron phosphate powder when ratio of the Li, Fe, P is1:1:1、ball-milling60min、calcining temperature700℃and4h is about120mA h g-1. The product preparied by the experiment can take as industrial production materials to the application.