Influence Comparison of Precursors on LiFePO4/C Cathode Structure for Lithium Ion Batteries

Electricity is the most energy demanded in this era. Energy storage devices must be able to store long-term and portable. A lithium ion battery is a type of battery that has been occupied in a secondary battery market. Lithium iron phosphate / LiFePO 4 is a type of cathode material in ion lithium batteries that is very well known for its environmental friendliness and low prices. LiFePO 4 /C powder can be obtained from the solid state method. In this study the variables used were the types of precursors : iron sulfate (FeSO 4 ), iron oxalate (FeC 2 O 4 ) and FeSO 4 +charcoal. Synthesis of LiFePO 4 /C powder using Li:Fe:P at 1:1:1 %mol. Based on the XRD results, LiFePO 4 /C from FeSO 4 +charcoal shows the LiFePO 4 /C peaks according to the JCPDS Card with slight impurities when compared to other precursors. XRD results of LiFePO 4 /C with precursors of FeSO 4 or FeC 2 O 4 shows more impurities peaks. This LiFePO 4 /C cathode is paired with lithium metal anode, activated by a separator, LiPF 6 as electrolyte. Then this arrangement is assembled become a coin cell battery. Based on the electrochemical results, Initial discharge capacity of LiFePO 4 /C from the FeSO 4 precursor is 19.72 mAh/g, while LiFePO 4 /C with the FeC 2 O 4 precursor can obtain initial discharge capacity of 17.99 mAh/g, and LiFePO 4 /C with FeSO 4 +charcoal exhibit initial discharge capacity of 21.36 mAh/g. This means that the presence of charcoal helps glucose and nitrogen gas as reducing agents.