Purification Of Electrolytic Manganese Anode Slime And Preparation Of Lithium-rich Manganese-based Cathode Materials

Electrolytic manganese anode slime is the solid waste generated in the electrolytic manganese metal,most of anode slime resource recycling is not sufficient,not only caused a great waste of ore resources,but also brings serious environmental pollution,and the research on the utilization of electrolytic manganese anode slime is more and more in-depth.At the same time,lithium manganese-rich cathode material is a new cathode material for lithium ion battery,which has the high specific capacity and good cycling performance.This paper chooses electrolytic manganese anode slime as the research object,taking the resource utilization as the research target,the paper further optimizes the lead removal technology of electrolytic manganese anode slime,analyzes the effect of the anode mud particle size,leaching temperature,ammonium acetate concentration and leaching time on lead leaching,and studies the equilibrium law of lead in the leaching system.The purified electrolytic manganese anode slime was prepared into a lithium manganese-rich cathode material to investigate the effect of calcination temperature and lithium content on the structure and electrochemical properties of the material,and the anode material was modified by doping lanthanum oxide.The electrolytic manganese anode slime was treated with 750?high-temperature roasting,the effects of particle size,leaching temperature,ammonium acetate concentration and leaching time on lead leaching rate were analyzed.The results showed that the leaching rate of lead was about 99.3%under the optimum conditions which average particle size of electrolytic manganese anode slime was-13?m,leaching temperature was 80?,concentration of ammonium acetate solution was 2mol/L and leaching time was 30min.After leaching,pure porous networked manganese dioxide powder could be obtained.Through the dynamic analysis,the empirical formula of the correlation between the distribution coefficient K and the leaching temperature T was K=e^{?-13.821+0.234*T?},and the empirical formula of the correlation between leaching rate V and leaching temperature T was V=0.1*e^T?17.096+1.235.Increasing the leaching temperature could not only accelerate the leaching rate,but also increase the leaching efficiency of the leaching agent and increase the total amount of lead.The total leaching of lead was two times that of the single lead in the leaching temperature of 80?.The cathode materials xLi₂MnO_3·?1-x?LiNi_0.3Co_0.3Mn_0.4O₂ were synthesized by co-precipitation reaction,the effects of roasting temperature and lithium-rich amount on the properties of the materials were investigated.Through characterizing and testing the prepared cathode material,the optimum calcination temperature was 800?,and the lithium-rich amount was 1.2.The results showed that the particle size is uniform and the crystallinity is higher in the cathode material prepared under this condition,which belonged to the R-3m?166?space group.The first charge/discharge specific capacities were 197.6mAh/g and130.4mAh/g,at 0.1C rate in the voltage range of 2.0⁴.8V.The discharge specific capacity was 84.9mAh/g,and the capacity retention rate was 65.1%after 30 cycles.The cathode materials Li_1.2Ni_0.24Co_0.24Mn_0.52O₂ with different amount of lanthanum on were prepared,and the doping amount of lanthanum oxide were 2%,4%and 6%.The results showed that with the increase of the doping amount of lanthanum,the main structure of the anode material was not changed after doping,but a new structure was formed,and the initial charge/discharge specific capacities were 218.5mAh/g and 145.6mAh/g,at 0.1C rate in the voltage range of 2.0⁴.8V.The discharge specific capacity was 114.0mAh/g,and the capacity retention rate was 78.3%after 30 cycles.