Synthesis and modification mechanism of vanadium oxide coated LiFePO₄ cathode materials with excellent electrochemical performance

Abstract

In an era of rapid industrial development, such that the demand for energy is increasing daily, lithium-ion batteries (LiBs) are playing a dominant role in energy storage devices due to their high safety and low cost. However, it is still a challenge for the preparation of advanced cathodes, which can determine the battery performance, with stable structures and fast diffusion of Li+. This is especially the case for lithium iron phosphate (LFP), a cathode material with severe limitations due to its low conductive efficiency. To improve its conductivity, LFP was compounded with defect-modified V2O5to prepare LFP/V/C materials with excellent electrochemical properties, which exhibited an initial capacity of 138.85 mAh/g and 95% retention after 500 charge/discharge cycles at a current density of 5C. Also, the effect of defects on ionic diffusion was discussed in detail by means of DFT calculations, confirming that the improvement of electrochemical performance is closely related to the introduction of hybrid conductive layers of surface cladding. Key Words: Lithium iron phosphate; Vanadium oxide; Lithium-ion battery; Solvothermal.

Beyond conventional batteries: a review on semi-solid and redox targeting flow batteries-LiFePO4 as a case study

“…32–34 However, the sluggish diffusion kinetics of lithium ions and the poor electronic conductivity, resulting in a significant capacity loss at high C-rate, are the main obstacles that limit the performances of this material. Several strategies have been developed to overcome the aforementioned issues such as particle size reduction, 35–37 surface coating, 38–41 preparation of composite electrodes, 42–44 addition of conductive binders, 45–47 and doping. 48–51 All these strategies have shown encouraging results in lithium-ion batteries, but less attention has been given to the application of these advanced LFP based materials for redox flow batteries.…”

The Effect of Different Amounts of Conductive Carbon Material on the Electrochemical Performance of the LiFePO4 Cathode in Li-Ion Batteries

“…Due to its relatively low cost and safer operation, LiFePO 4 is considered an ideal material to utilize as the cathode in large-scale lithium-ion batteries [3,4]. The additional benefits of LiFePO 4 -based batteries for powering electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs) are their high theoretical capacity (170 mAh g −1 ), good electrochemical window (2-4 V), superior cycle performance, excellent thermal stability, environmental friendliness, low self-discharge, and the safety of olivine-type LiFePO 4 [5][6][7][8]. For two decades, LiFePO 4 has been the subject of extensive research for both scientific and engineering applications [9].…”