Synthesis and Characterization on Nickel Orthosilicate Anode of Lithium-Ion Battery

摘要

Ni_2SiO_4 was prepared by chemical precipitation process as a novel anode material for lithium-ion batteries. The structure and morphology of further annealed Ni_2SiO_4 samples were characterized by XRD and SEM analysis. The electrochemical performance including cyclic voltammetric curves (CV), electrochemical impedance spectra (EIS), charge/discharge curves and cycling performances were also determined. The results demonstrated that the crystal structure of the samples is orthorhombic having space group Pmn21. The morphological structure of materials exhibited cubic particles with sizes in the range of 50-80 nm. The first cycle charge capacity of the pure Ni_2SiO_4 particles reached to 753 mAh g~(-1) with the coulombic efficiency of 63.8%. The charge capacity remained 305 mAh g~(-1) at a current density of 100 mA g!(-1) even after 50 cycles, which is nearly 208% higher than those of the Ni_2SiO_4 with SiO_2 impurity. Ni_2SiO_4 can be a promising alternative anode material.