Using Electrolytic Manganese Anode Slime Preparation Of Precursor Synthesize The Manganese Lithium Battery Material

The current production of manganese metal method is mainly electrolytic manganese method in China,and in the process of producing electrolytic manganese anode region will produce a lot of anode slime,anode slime belong to hazardous solid waste,piling up at random is not only a waste of resources but also cause harm to the environment.Based on the electrolytic manganese anode slime as the research object using a preliminary understanding of the composition of electrolytic manganese anode slime,simple pretreatment process of electrolytic manganese anode slime was studied,the study on purification in addition to the lead with the same conditions for the anode slime roasted at different temperature conditions,the samples after impurity removal and leaching solution are tested and analyzed and get the High purity Mn₂O₃.With manganese oxide as raw materials,adding a certain amount of cobalt or nickel and adding cobalt and nickel at the same time to adopt high temperature solid phase synthesis method for lithium ion battery cathode material precursor.With the lithium nitrate as the source of lithium,the preparation of precursor further,to adopt high temperature solid phase synthesis method of a variety of manganese lithium battery material and analyzed their electrochemical performance for the synthesis of battery materials.The main research results are as follows:Firstly,this study used XRF anto analyze element in anode slime roasted at different temperatures before and after,the test results show that the electrolytic manganese anode slime before roasting mainly containing Mn,Pb,and metallic elements such as Ca,Ca,Se,Sr.The element types is not much change after roasting,and combined with microwave digestion and flame atomic absorption method for determining the content of each element,the average content of manganese anode slime after roasting increased about 4%,the average content of lead is increased about 0.2% than before roasting.In addition we know a simple high temperature roasting process cannot remove everything impurities in anode slime.Using XRD and SEM characterized the anode slime which roasted at different temperatures and purification treatment.XRD analysis showed that the anode slime roasted at 750 ? after purification treatment basic as pure phase of Mn₂O₃,the anode slime roasted at 950 ? after purification treatment for basic Mn₃O₄,SEM analysis showed that the anode slime roasted at 750 ? particle size is small,the sample clear mesh structure on the whole,and the anode slime roasted at 950 ?particle size is larger,angular particles,is typical of the cubic structure,reunion phenomenon obvious between particles,structure is very compact.EDS test results showed that the anode slime roasted at 750 ? after purification treatment is to remove impurities of lead completely,the anode slime roasted at 950 ? after purification treatment is still contain a certain amount of impurities of lead.In this paper with the preparation of high purity Mn₂O₃ source as the source of manganese,tetrahydrate acetic acid cobalt as the source of cobalt,nickel acetate as the source of nickel,then preparated the precursor t of manganese lithium battery material ratio at different measuremen by ball mill mixing and high temperature solid phase synthesis.The preparation of precursor materials were analyzed by XRD and SEM test.The analysis results showed that the precursor of the preparation of doped cobalt element mainly Co-Mn-O structure of the solid solution,mixed with precursor of the preparation of nickel element mainly for Ni-Mn-O structure of the solid solution,and a small amount of Mn₂O₃ and NiO phase,the precursor of the preparation of the main elements of cobalt and nickel elements adding at the same time for the stability of the layered structure of Co-Ni-Mn-O structure solid solution.Co-Mn-O structure of solid solution and the structure of Co-Ni-Mn-O solid solution structure is stable at high temperatures is not easy to decompose,and the structure of the Ni-Mn-O solid solution under the condition of high temperature is not stable,some are decomposed into Mn₂O₃ and NiO becomes part of the quadratic phase material.This research selected lithium nitrate as the source of lithium,then combine with the preparation of manganese lithium battery precursor material above through ball mill fully mixing,high temperature solid phase method synthesis of manganese lithium battery material further.And the preparation of battery materials are characterized by XRD,SEM.XRD results showed that the incorporation of the preparation of lithium cobalt manganese lithium battery material has obvious layered structure,the preparation of mixed with lithium nickel manganese lithium battery material cannot very well,cambium-like structure,preparation of doped with lithium cobalt nickel manganese lithium battery material also formed a typical lamellar structure,and the layered structure is well developed.Synthesis of manganese lithium battery material as the anode,lithium metal as the cathode,assembled button battery of CR2032 type,and electrochemical performance test was carried out on the battery.The electrochemical properties test results show that compared with lithium battery anode materials only adding the lithium,mixed with the anode material of the preparation of lithium and cobalt can increase the discharge capacity to a certain extent,material circulation performance is also enhanced;Doped lithium nickel preparation on the discharge capacity of the anode materials have increased but the effect is not obvious,material circulation due to capacity attenuation performance;Preparation of doped lithium?cobalt and nickel anode materials obviously increase the discharge capacity,and material cycle performance also strengthen obviously.