THE EFFECT OF COBALT DOPING ON THE HEMATITE MATERIAL SYNTHESIZED USING PRECIPITATION METHOD AS A LITHIUM-ION BATTERY ANODE

Hematite is an iron oxide that has the most stable and environmentally friendly structure. Hematite is used as a good anode material, this is due to its high specific capacity, good chemical and thermal stability, and low cost. Hematite has weaknesses, namely poor cycle stability, unable to withstand volume changes, and low conductivity values. To improve the electrochemical performance of lithium-ion batteries, modifications are made to the anode material by adding a dopant. This research aims to synthesize Co-doped hematite material with variations of 0.2, 4, and 6.8% using NaOH and KOH precipitating agents, characterize Co-doped hematite material using FTIR, XRD, SEM-EDX, and analyze its electrochemical performance as a lithium-ion battery anode. The method used is deposition. The synthesis results obtained brick red and black precipitates. FTIR characterization shows that the sample contains the Fe-O-Fe functional group which appears at wave numbers 519.19 and 517.32 cm-1. Based on XRD characterization, samples of undoped hematite and 6% Co had crystal sizes of 26.4193 nm and 20.6927 nm. SEM characterization results show that the morphology of the 6% Co-doped hematite sample has an irregular semi-spherical shape. The electrochemical test results show that the battery with the best electrochemical performance was produced by a 6% Co-doped hematite sample which had a conductivity value of 2.35 x 10-3 S/cm and the resulting battery capacity efficiency reached 99.9%.