Characterization of Modified Nickel Silicate Anode Material for Lithium–Ion Batteries
Ni2SiO4, as a new anode material for lithium–ion batteries, was prepared by the high-temperature calcination method in this work. The MgO-coated NSO was prepared by melt injection method. Electrochemical properties, including voltammogram (CV), electrochemical impedance spectroscopy (EIS), charge/discharge curves and cycle performance were tested. The structure and morphology of materials were further characterized by XRD and SEM. The results demonstrated that the MgO-coated Ni2SiO4 materials exhibited higher cycle charge capacity and coulombic efficiency than that of Ni2SiO4. When the MgO coating amount is 1%, the first cycle charge capacity and coulombic efficiency were 584.2 mAh/g and 66.25%, respectively. After 50 cycles, the charge capacity was still maintained at 359.7 mAh/g when the current density was 100 mAh/g, which was 162.7 mAh/g higher than the NSO. The crystal structure of the materials belongs to an orthorhombic system, and the morphological structure presented cubic particles. Therefore, the NSO anode material has a better cycle stability and high capacity when the MgO coating amount is 1%.
KeywordsMgO-coated Ni2SiO4 Electrochemical properties Anode material Lithium–ion batteries
The authors acknowledge the financial support provided by the National Science Fund of China (No. 51674225, No. 51774252), the Innovative Talents Foundation in Universities in Henan Province (No. 18HASTIT011), the Educational Commission of Henan Province of China (No. 17A450001, 18A450001), and the China Postdoctoral Science Foundation (No. 2017M622375).
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