Synthesis And Electrochemical Properties Of Ni-Co-Al Nano Oxides

With the depletion of non-renewable resources such as oil and natural gas,it has become an urgent matter to develop sustainable new energy sources and build a low-carbon and environment-friendly Society,Lithium-ion batteries as a new type of green energy battery have been widely concerned by the society.Among many electrode materials,ternary cathode materials are considered to be a commercially useful battery material because of its low cost,excellent electrical conductivity,high discharge specific capacity and environmentally friendly.In this paper,LiNi_0.8Co_0.15Al_0.05O₂ cathode materials with different morphologies were prepared by electrospining technology,hydrothermal method and spray drying technology.The electrode materials were characterized by XRD,EDS and SEM.The electrochemical performance of the electrode materials was examined by the battery testing system and electrochemical workstation.The effects of the morphology,structure and element distribution on the electrochemical properties of LiNi_0.8Co_0.15Al_0.05O₂ cathode materials were systematically investigated.The LiNi_0.8Co_0.15Al_0.05O₂ cathode materials synthesized by electrospinning technology,hydrothermal method and spray drying technology are all layered hexagonal?-NaFeO₂ structure,which is an R-3m space group.The LiNi_0.8Co_0.15Al_0.05O₂ nanofibers were synthesized by electrospinning technology,the initial discharge capacity of LiNi_0.8Co_0.15Al_0.05O₂ nanofibers can reach 200.07 mAh·g^-1 at 0.2 C after calcination at700?.The LiNi_0.8Co_0.15Al_0.05O₂ cathode materials were synthesized using nitrate as the primary material by hydrothermal method.The effects of hydrothermal time and temperature on the morphology and electrochemical properties of the electrode materials were studied.It was found that the electrochemical performance of the cathode materials synthesized at hydrothermal time of 12 h and temperature of 180?were better.The spheroidal LiNi_0.8Co_0.15Al_0.05O₂ cathode materials were synthesized using sulfate as the primary material by hydrothermal method.It was found that the cycle performance of the cathode materials synthesized at hydrothermal time of 12 h were better.The LiNi_0.8Co_0.15Al_0.05O₂ cathode materials were synthesized by spray drying technology.The effects of calcination temperature on the morphology and electrochemical properties were investigated.The electrode materials synthesized at 700?have good cycling performance,relatively small charge transfer resistance and good lithium ion diffusion.