With the growing shortage of global energy and resources, the development of new energy and comprehensive utilization of the secondary resources have become the focus of worldwide attention. In this paper, we propose to synthesize lithium-ion battery cathode material LiMn2O4from anodic manganese slag.The present study involves the recovery of manganese by using lead-rich manganese anode slag from electrolytic manganese plant. Glucose is used as reductant for reductive leaching of manganese anode slag and sulfuric acid is used as leaching solvent. The effects of important parameters such as temperature, sulfuric acid and glucose concentration are investigated and the process conditions are optimized using response surface methodology (RSM) based on central composite design (CCD). The results show that the effect of temperature is the most significant factor that influenced the manganese leaching yield, followed by the effect of glucose concentration, and the effect of sulfuric acid concentration within the range of experimental conditions. At the meantime, the effect of sulfuric acid concentration is the most significant factor that influenced the lead leaching yield, followed by the effect of temperature, while the effect of glucose is not significant. It is found that the leaching ratio of Mn reached93.22%, while the extraction of Pb was only0.39%under the conditions of leaching temperature80℃, the ratio of glucose to slag0.175:1, and the ratio of acid to material0.8:1. The results show that extracting manganese from anode slag in sulfuric acid using the glucose as reductant proved to be highly effective.MnOOH precursors are successfully synthesized by two-step oxidation-precipitation method (the first step is oxidized by oxygen in the air, and the second is oxidized by H2O2) under the conditions of pH8.7, reaction temperature room temperature, aging temperature100℃, aging time6h. X-ray diffraction and scanning electron microscopy results show that sample was nanowire crystalline materials. Meanwhile, spinel-typed LiMn2O4cathode active materials have been prepared for different microstructures at solid-state reaction high temperature method using different forms of manganese. The powder prepared from MnOOH, with good crystallinity and a regular cubic spinel shape, exhibits an initial discharge capacity of129.03mAh·g-1at0.1C rate, and a capacity retention ration of81.89%after30cycles at room temperature.LiMn2O4materials are obtained through MnOOH precursor, which are synthesized by Mn-rich leaching solution. The effect of calcinations temperature and time on the physical and electrochemical properties of the samples is studied. It is showed that LiMn2O4which calcined at700℃for24h possesses of best electrochemical performance. It exhibits an initial discharge capacity of135.21mAh·g-1at0.1C rate, and a capacity retention ration of77.94%after30cycles at room temperature. |