Enhanced Electrochemical Performance of Li2ZrO3 coated LiFePO4 as Cathode Material for Lithium Ion Batteries

Li2ZrO3-coated LiFePO4 (LFP@C/LZO) was prepared by hydrothermal synthesis and ex-situ coating for the first time. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and charge-discharge tests were used to characterize lithium iron phosphate and the influences of different coating amounts on the material were systematically studied. The results show that when Li(2)ZrO(3 )is 2 wt%, LFP@C/LZO-2 exhibits excellent electrochemical performance where the initial discharge capacities are 156.7 mAh/g and 111 mAh/g at 0.1 C and 1 C, respectively. And after 200 cycles at 1 C, the capacity can retain 81.62% of the initial value. Electrochemical impedance spectroscopy (EIS) shows that the introduction of Li2ZrO3 can decrease the charge transfer resistance and improve the lithium-ion diffusion rate. The study reveals a moderate amount of Li2ZrO3 can helpfully enhance the electrochemical properties of LFP and broadens options for surface coating of LFP and other electrode materials.

Automated summary

Li2ZrO3-coated LiFePO4 (LFP@C/LZO) was prepared by hydrothermal synthesis and ex-situ coating for the first time. The effects of different coating amounts on the material were systematically studied, showing that an appropriate amount of Li2ZrO3 can enhance the electrochemical performance of LFP by decreasing the charge transfer resistance.