α-Fe_2O_3/Fe_3O_4复合负极材料的制备与电化学性能研究

The synthesis and electrochemical performance of α-Fe_2O_3/Fe_3O_4 composite anode electrodes

通过固相反应法合成出α-Fe2O3/Fe3O4复合产物,利用XRD、Raman、SEM等技术和恒电流充放电方法,探讨了恒温反应时间对材料微观结构、形貌以及电化学性能的影响。研究表明,恒温反应时间对复合产物中各组分的相对含量、形貌与电化学性能影响较大;除首次循环外,复合负极材料在随后充放电过程中库伦效率可达96%以上,循环性能与倍率性能明显优于单相α-Fe2O3负极材料与Fe3O4负极材料。

α-Fe2O3/Fe3O4 composite have been synthesized through a solid reaction route. The correlation between reaction time and microstructure,morphology,electrochemical properties of various composites were investigated via XRD,Raman spectrum,SEM and galvanostaic measurements. The results reveal that reaction time has a significant effect on the concentration and electrochemical performances of the α-Fe2O3 and Fe3O4 composite. The excellent cycling properties were measured and their coulombic efficiency can reach 96% except the 1st cycle. Furthermore,better cycling and rate properties of the composite were obtained compared with those of the single α-Fe2O3 and the single Fe3O4 anode materials.