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High-performance LiFe0.98V0.02PO4/3DG/C synthesized by hydrothermal route using FePO4 as precursor

Authors :
Weifen Jiang
Shunhua Xiao
Jianwen Yang
Zeng Wei
Yuan Min
Yanwei Li
Lin Gang
Source :
Journal of Alloys and Compounds. 782:176-182
Publication Year :
2019
Publisher :
Elsevier BV, 2019.

Abstract

Spherical FePO4 and three-dimensional porous graphene (3DG) were prepared by hydrothermal synthesis, then LiFe0.98V0.02PO4/3DG/C composite was prepared by two-step sintering method based on FePO4/3DG. The structure, composition and morphology of the synthesis production were confirmed by X-ray diffraction (XRD), Raman spectra, Energy Dispersive Spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The electrochemical properties were studied by cyclic voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS) and charge/discharge tests. At a current density of 0.2C, the first charge/discharge specific capacities were 161.1 mAh/g and 159.1 mAh/g, and the corresponding capacity retention rates after 50 and 100 cycles was 99.5% and 99% respectively. In addition, LiFe0.98V0.02PO4/3DG/C composite had a better rate and cycle performance, as well as greater Li+ diffusion coefficient (DLi+) compared with LiFePO4/C and LiFePO4/3DG/C. Therefore, LiFe0.98V0.02PO4/3DG/C composite will become a potential cathode materials for lithium-ion (Li+) power batteries.

Details

ISSN :
09258388
Volume :
782
Database :
OpenAIRE
Journal :
Journal of Alloys and Compounds
Accession number :
edsair.doi...........2a63373f4b4e8285aed07b0b2def9132
Full Text :
https://doi.org/10.1016/j.jallcom.2018.12.108