Solventless Synthesis of Core–Shell LiFePO₄/Carbon Composite for Lithium-Ion Battery Cathodes by Direct Pyrolysis of Coronene

Abstract

LiFePO4 (LFP) as a cathode material for lithium-ion batteries (LIBs) requires the application of carbon composite to compensate its poor electrical conductivity. Thus, it is important to develop an efficient and cost-effective carbon composite process. This work demonstrates a new carbon coating (CC) method involving the direct solventless pyrolysis of the polycyclic aromatic hydrocarbon coronene (C24H12) as a means of coating LFP powder. The electrochemical properties of the resulting LIB cathodes were examined to find that the CLFP cathode exhibited a high specific capacity of 154 mAh/g at 0.05 C, which corresponds to 91% of the theoretical capacity of LFP (170 mAh/g), and LIB cells with the CLFP cathode showed rate capabilities and cycling performance comparable to those of commercial LIB cells. Due to the simple CC process and the associated formation mechanism, we anticipate that this method will have practical applications in the large-scale manufacture of LFP for LIB cathodes with low cost.

Preparation and Electrochemical Performance of Na2−xLixFePO4F/C Composite Cathode Materials with Different Lithium/Sodium Ratios

“…Currently, ion doping and carbon coating are the two methods available to tackle these issues [ 8 ]. Doping can significantly increase the sodium ion diffusion coefficient of a single particle, while carbon coating can lower the charge resistance at the interface between two neighboring particles, as well as between the electrolyte and the particles themselves [ 9 ]. Most research to date has focused on improving the electrochemical properties of the materials via polyanion coating, doping, and the use of various carbon sources.…”

Controllable synthesis of hierarchical micro/nano structured FePO4 particles under synergistic effects of ultrasound irradiation and impinging stream

“…Iron (III) phosphate, or FePO4 (FP), has been recognized as an appropriate and promising material, which is widely used in synthesis of the electrode precursor for lithium ion battery [21,22], in fabrication of catalyst [23,24], and in production of fertilizers [25]. According to previous stuides, preparing FP particles with micro/nano hierarchical porous structure can improve FP performance, especially as precursor for lithium ion battery [26,27].…”

Hydraulic Compaction on Electrode To Improve the Volumetric Energy Density of LiFePO4/Graphite Batteries

“…Hence, manufacturing electrode materials toward high-capacity is a constant target. In recent years, high-capacity LFP has been reported by many researchers. − However, the low tap density of nano-LFP and carbon-coated LFP will restrict the volumetric energy density. It is difficult to balance the relationship between the specific capacity and tap density of LFP.…”