Synthesis And Structure Regulation Of Transition Metal Oxides

The ternary layered oxide(LNCMO)has become the most promising cathode material for lithium ion batteries due to its higher discharge platform,better electrical conductivity,and higher theoretical capacity.In this dissertation,ternary cathode materials with different morphology were prepared by solvothermal method.The structure and morphology of the material were analyzed by XRD,SEM and EDS.The effects of different morphological structures on the electrochemical performance of the material were investigated by galvanostatic charge and discharge tests and EIS tests.The nickel-cobalt-manganese oxides synthesized by the solvothermal method belong to the hexagonal system and are in the ?-NaFeO2 layered structure,which is the R-3m spatial point group.When the solvothermal temperature is 180°C and the amount of surfactant added is 1g/100 ml,the morphology of the precursor material obtained is the most uniform,the sheet structure is the most complete,the degree of cation mixing is minimum,and the cycle stability and rate performance of the material are the most Excellent;by changing the elemental ratio of Ni,Co,Mn,we have obtained nickel-cobalt-manganese ternary cathode materials with different morphology.Among them,the NCM ratio of 5:2:3 has a unique lamellar shape and has the best The rate performance.Finally,the fibrous materials and solvothermal materials were composited to obtain a new type of "neuron" morphology of the ternary cathode material.its cycle stability and rate performance have greatly improved.