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 i...

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Bibliographic Details
Published in:International journal of electrochemical science 2022-07, Vol.17 (7), p.220758, Article 220758
Main Authors: Guo, Ruitong, Zhu, Huiting, Wang, Xingyao
Format: Article
Language:English
Subjects:
Li2ZrO3
LiFePO4@C
Lithium-ion batteries
Surface coating
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Summary: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 Li2ZrO3 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.
ISSN:1452-3981
1452-3981
DOI:10.20964/2022.07.29