Electrochemical Preparation of Lithium-Rich Graphite Anode for LiFePO4 Battery

Abstract

The lithium-rich graphite anode is prepared using porous lithium foil/graphite for LiFePO4 battery. The specific capacities of LiFePO4/lithium-rich graphite battery are tested by the galvanostatic current charge-discharge technology at higher current densities. The lithium-rich graphite anode can improves the capacities of LiFePO4/lithium-rich graphite battery at higher currents. During 300 cycles of charge-discharge no short circuit is observed in the lithium-rich battery at 0.5~5 mA cm–2. The electrode materials are characterized by scanning electron microscopy, X-ray diffraction powder diffraction, thermogravimetric analysis, and AC impedance, indicating that there was no obvious damage to the battery materials, and the capacity attenuation at the higher current density was caused by the increase of polarization voltage due to the lack of lithium ions in the cathode and the increase of anode resistance.