Abstract
In this work, LiFePO4/C (LFP/C) cathode materials with superior electrochemical performance have been prepared by coaxial and uniaxial electrospinning method. The electrode materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Also, cyclic voltammetry (CV), galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS) measurements were performed on these materials. The experimental results indicate that the electrochemical properties of LFP/C-C, such as specific capacity, coulombic efficiency, Li+ diffusion coefficient and overpotential are significantly improved. The enhanced electrical conductivity and polarization of the LFP/C-C electrode are mainly due to its porous morphology and amorphous carbon coating layer.
Highlights
Increased production and usage of electric vehicles and hybrid vehicles in recent years have accelerated the development of the lithium-ion battery (LIB) [1]
The porous electrode materials can be prepared by many different ways, such as catalytic chemical vapor deposition (CCVD) [15], hydrothermal method [16] [17], sol-gel method [18], microwave irradiation assisted synthesis (MIAS) [19] [20], solvothermal method [21] [22], self-assembly [23], and carbothermal reduction method [24]
Single-crystalline nanowires of LiFePO4/C with excellent electrochemical performance have been prepared by uniaxial electrospinning [25]
Summary
Increased production and usage of electric vehicles and hybrid vehicles in recent years have accelerated the development of the lithium-ion battery (LIB) [1]. (2016) Electrochemical Performance of LiFePO4/C via Coaxial and Uniaxial Electrospinning Method. Using porous active LFP materials can help to improve the basic technical parameters of LIBs. The porous active materials typically show excellent electrochemical performance due to their significantly higher specific surface area, which helps the charge transfer between electrode and electrolyte, as well as more available paths for the permeation of ions. Single-crystalline nanowires of LiFePO4/C with excellent electrochemical performance have been prepared by uniaxial electrospinning [25]. These nanowires grow along the c-axis with uniform distribution of the carbon layer. Porous nanofibers of LiFePO4/C were successfully prepared by sintering the fibers obtained via coaxial electrospinning method. The properties of LiFePO4 prepared by coaxial electrospinning are obviously better than those by uniaxial electrospinning
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