Preparation and lithium storage properties of LaMO3(M=Mn,Fe,Co,Ni)
Lanthanide-based perovskite-type oxides are deeply favored by researchers because of their high theoretical capacity,simple preparation,and abundance of raw materials,but these materials still have shortcomings,i.e.,the capacity is prone to decay,the conductivity is low,and the volumetric effect during de-embedded lithium process.In this paper,LaMO3(M=Mn,Fe,Co,Ni)chalcogenide oxide materials with different B-components were prepared by a simple sol-gel method.X-ray diffractometer was used to test the crystal structure of the samples,Rietveld method was used to fine-tune the XRD data,field emission scanning electron microscope was used to observe the morphology and microstructure of the samples,and finally,the electrode materials were assembled into a CR2032 battery to evaluate the electrochemical properties of the electrode materials,and multiple electrochemical tests were used to analyze the respective electrochemical properties.It was found that the electrochemical properties of LaMO3(M=Co,Fe,Mn,Ni)prepared by sol-gel method varied with different particle sizes.Among them,LaNiO3 nanoparticles own the discharge specific capacity reaches 573.8 mAh·g-1 after 500 cycles at 500 mA·g-1 with a smoother curve and a continuous growth trend.Even though at a high current density of 5 A·g-1,its discharge capacity also reaches 146 mAh·g-1,which is significantly higher than that of the other three materials.Finally,the paper summarizes the reasons for the excellent electrochemical performance of LaNiO3.
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