Synthesis and electrochemical characterization of C - doped LiFePO4 material for supercapacitor application

Abstract

In this study, we present a rapid hydrothermal synthesis of carbon-incorporated lithium ferric phosphate (LiFePO₄/C) and a simple method for fabricating supercapacitors using LiFePO₄/C as positrodes materials. The structure of active materials were analyzed by XRD, Raman spectrum and XPS. The morphology of both pure and C-doped LiFePO₄ was examined by TEM, while their electrochemical properties were evaluated through CV, CP and EIS. The effect of precursor concentration on the morphology and electrochemical performance was studied in 1 M KOH electrolyte solution. The synthesized electrodes demonstrated excellent charge storage abilities, with for Li_0.8Fe_0.2PO₄/C showing highest specific capacity equal of 220 C/g at scan rate of 1 mV/s. An asymmetric supercapactior cell prepared using LiFePO₄/C as the positive electrode achieved a specific capacity of 190 C/g at current density of 1 A/g.