Synthesis And Characterization Of Fe₂O₃/C Anode Materials By The Acid Pickling Iron Oxide Red For Lithium Ion Batteries

In recent years,the production of electric car increased year by year electric with the development of new energy automotive industry.The battery performance has a siginigicant effect on the electric cars.The lithium-ion battery is the best choice for electric vehicles due to its high energy density,high working voltage and long cycle life.However,in the automotive industry,lithium ion batteries require lower costs,lower safety risks,a higher specific energy density and longer cycle life under everyday conditions.As an important part of lithium battery,negative electrode material has serious influence on the performance of lithium battery.Fe₂O₃ has become a hotspot for researchers because of its high energy density,high working voltage and long cycle life.In order to reduce the cost of lithium ion battery and utilize the the acid pickling iron oxide red,this paper has synthesized the Fe₂O₃ with the acid pickling iron oxide red.Fe₂O₃ has been produce by high energy mechanical alloying.When the time of mechanical alloying was 2.5 h,the electrochemical properties and particle size of the samples were not much changed.Therefore,2.5 h is the optimal processing time.The effects of SDS and glucose addition on the morphology and electrochemical properties of Fe₂O₃ anode materials were studied.It has the best cycling performance when the SDS addition is 6%.Its capacity retention rate is 41.73%after 100 cycles at a current density of 100 mAg-1.The appropriate amount of SDS can improve the dispersion of materials which is conducive to the stability of the material structure.When the glucose was added to 60%,the sample had the optimal cycle performance.After 250 cycles at 100 mA/g current density,the capacity retention rate was 61.51%.The carbon produced by the glucose can improve the conductivity of the material,the ion diffusion rate,and then greatly improve the performance of the cathode material.The effects of glucose addition on the morphology and electrochemical properties of Fe₂O₃ anode materials were investigated.When the amount of glucose is 40%,its electrochemical properties are most prominent.After 100 cycles at 100 mA/g current density,the capacity retention rate was 39.42%.An adequate thickness of carbon coating can improve the conductivity of the material and reduce the volume expansion,which can obviously improve the cycle performance of the material.The influence of hydrothermal time on the morphology and electrochemical properties of Fe₂O₃ anode materials were investigated.When the hydrothermal time was 24 h,the sample showed the optimal cycle and rate performance.After 70 cycles at different current density,the ratio was 1509.3 mAh/g.It mainly depends on the improvement of purity of the material small holes in the interior,alleviating the expansion of the volume,which can obviously improve the electrochemical properties of the materials.