Preparation And Electrochemical Properties Of ZnCo₂O₄ Cathode Material For Lithium Ion Batteries

Lithium ion batteries because of high energy density,long cycle life,high specific capacity,recently has gradually become the main development direction of new energy.Electrode material has an important effect on the performance of lithium ion battery,in which the transition metal oxide anode material has much higher than the theoretical capacity of graphite anode material and become a hot spot.Spinel-type cobaltate has attracted much attention because of its high discharge specific capacity,high thermal stability,low cost and low toxicity.However,due to the volume changes in the process of charging and discharging,poor conductivity and other shortcomings restrict its development and application.Studies have shown that nanocrystallization,morphology control and element doping can effectively alleviate the above defects,thereby improving its electrochemical performance.In this paper,taking ZnCo2O4 as the research object,zinc nitrate as zinc source,cobalt nitrate as cobalt source,urea as precipitant and CTAB as the surfactant,precursor prepared by solvent heat method,and then calcined at high temperature to obtain ZnCo2O4.In the experiment,the process parameters of urea:CTAB,heating temperature,holding time and calcination temperature were compared with the control variables to study their influence on the structure,morphology and electrochemical properties of the materials.On the basis of this,the optimum test conditions are optimized,and the discharge capacity of the prepared battery after 50 cycles is still 261.9mAh/g.The effect of different Fe content doping of Co atoms on the structure,morphology and electrochemical properties was investigated.research shows that the cycling stability was improved by the doping of the Fe element,and the discharge specific capacity of ZnCo1.6Fe0.4O4 after 50 cycles was up to 296.8 mAh/g.In order to make full use of this characteristic,the influence of Ni element doping was also studied.The results show that when x=0.2 for ZnCo2-xNixO4,the prepared material has good cycle performance and magnification performance,and the discharge specific capacity after circulating 50 times at a current density of 100 mA/g can reach 352 mAh/g,showing a good application prospects.