Study on Preparation and Electrochemical Performance of Lithium Iron Phosphate Cathode Ink

As a cathode material for lithium-ion batteries, lithium iron phosphate (LiFePO4) has received widespread attention due to its large discharge capacity, low price and no pollution to the environment. This article aims to prepare lithium iron phosphate and corresponding composite cathode inks with excellent performance suitable for microelectronic printers. Lithium iron phosphate inks with different concentrations were configured and then prepared into electrodes and the electrochemical performance of the electrodes prepared from the ink with optimal concentration was studied. The results show that when the ratio is 0.1 C, the specific discharge capacity of the lithium iron phosphate electrode with a printing concentration of 10% is as high as 142 mAh.g(-1). Based on the poor conductivity of lithium iron phosphate, a small amount of reduced graphene oxide was added to improve its conductivity. When the mass fraction of reduced graphene oxide is 0.6%, the discharge specific capacity of the composite material of lithium iron phosphate and reduced graphene oxide reaches 152.1 mAh.g(-1), and the Coulomb cycle efficiency is 99.2%, showing that the introduction of reduced graphene oxide is beneficial to improving the overall performance of the material.