Preparation And Lithium Storage Properties Of Metal Ion-doped M-Fe₂O₃?M=Sr,Al,Ni? Materials

Rapid development of today's energy is remarkable.In order to use renewable energy reasonably,it is urgent to start from the essential characteristics,such as electrode material types and structures,to develop energy-efficient storage devices with high efficiency and low consumption.Good docking between renewable energy system and electronic devices.Lithium-ion batteries have been regarded as excellent secondary batteries due to their long lifespan,large capacity,low discharge rate,and portability.In this paper,three kinds of ferrite nanomaterials for lithium ion battery electrode were synthesized by a simple hydrothermal reaction.A series of electrochemical tests were performed on the assembled battery.The details are as follow:1. The strontium-doped Sr_0.3Fe_1.8O₃ material was prepared by a hydrothermal reaction at 180?for 20 h with the calcination at 800?for 5 h with two raw materials?ferric citrate and strontium acetate?.XRD,AES test analysis was used to verify the content of the sample;meanwhile,SEM,TEM and BET were used to a characterization of the nanomaterials.The initial discharge specific capacity of the assembled battery is about 800 m Ah g^-1 at a current density of 500 m A g^-1,and the capacity retention rate is more than 80%after 820 cycles.Ultimately,the pseudocapacitance contribution of the prepared sample was involved.2. The aluminum-doped Al_0.08Fe_1.92O₃ mesoporous nanomaterials was prepared by a hydrothermal reaction at 140?for 25 h couple with the calcination at 800?for 5 h with two raw materials?ferric nitrate and aluminum nitrate?.Physical characterization of the material was studied by means of XRD,AES and EDS;in the meanwhile,SEM,TEM and BET were used to characterize the morphology of the sample.The electrochemical properties were studied with lithium metal as the counter electrode,and a series of electrochemical tests were carried out.Al_0.08Fe_1.92O₃ shows an outstanding specific capacity around 900 m Ah g^-1 at a current density of 500 m A g^-1,and the capacity retention rate is about 75%after 500 cycles,indicate a good rate performance and high cycle capacity retention rate of the sample.Ultimately,the pseudocapacitance contribution of the prepared sample was involved.3. The nickel aluminum-doped Al_0.08Ni_0.1Fe_1.85O₃ porous material was prepared by a hydrothermal reaction at 140?for 25 h couple with the calcination at 800?for 5 h with three raw materials?ferric nitrate,aluminum nitrate and nickel nitrate?.The phase structure of Al_0.08Ni_0.1Fe_1.85O₃ was studied by XRD,SEM,TEM and BET were performed to morphological characterization.the sample shows a reversible specific capacity above 600 m Ah g^-1 after 600 cycles at a current density of 2 A g^-1.In addition,it's found that the pseudocapacitance contribution of the sample are 39,50 and 56%in a sweeping rate of 0.2,0.5 and 0.8 m V s^-1,respectively,by comparatively studying the kinetic process of the Al_0.08Ni_0.1Fe_1.85O₃.