Studies On The Preparation Of Hierarchical Lini_1/3Mn_1/3Co_1/3O₂Microspheres And Its Electrochemical Performance

Hierarchical LiNi1/3Mn1/3Co1/3O2is regarded as a best substitute of LiCoO2for itshigh specific capacity, safety performance, economic and environmental advantages,which caused the wide attention of research workers. LiNi1/3Mn1/3Co1/3O2microsphereshave been successfully synthesized via a facile in-situ route with MnO2as the sacrificialtemplate.Firstly, MnSO4and NH4HCO3solution were used to synthesize spherical MnCO3. Toget porous MnO2, the as-obtained MnCO3was sintered at400°C for5h in the airfollowed by a series of washing and drying. Ultimately, LiOH solution was used toprecipitate Co and Ni on the framework of porous MnO2. After sintered at800°C for10hin the air, the s-LiNi1/3Mn1/3Co1/3O2was obtained.The s-LiNi1/3Mn1/3Co1/3O2sample shows an unique nano/micro hierarchical structure.As a cathode material for lithium-ion battery, the sample exhibits excellentelectrochemical performance with higher capacity, superior cycling stability and ratecapability as compared with that prepared by conventional co-precipitate reaction method.The discharge specific capacities for the first cycle are196,187,182and176mAh g-1at0.1,0.2,0.5and1C, respectively. The superior performance can be ascribed to the uniquemicrostructure with numerous nanosized primary particles that can provide rapid pathwayfor Li+and e-diffusion, and facilitate the penetration of the electrolyte.