Enhanced Electrochemical Performance of Li2ZrO3 coated LiFePO4 as Cathode Material for Lithium Ion Batteries
Ruitong Guo, Huiting Zhu, Xingyao Wang
Abstract
Li 2 ZrO 3 -coated LiFePO 4 (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 Li 2 ZrO 3 can decrease the charge transfer resistance and improve the lithium-ion diffusion rate. The study reveals a moderate amount of Li 2 ZrO 3 can helpfully enhance the electrochemical properties of LFP and broadens options for surface coating of LFP and other electrode materials.