Synthesis of LiFePO_4/Pani/C Composite as a Cathode Material For Lithium Ion Battery

摘要

In recent years, LiFePO_4 studied intensively as a cathode material for Li-ion batteries because of high theoretical capacity, stability, and environmental friendly. However, its low intrinsic electronic conductivity. One way to improve its conductivity is addition of conductive material. Polyaniline (PANI) is one of the conductive polymer materials that widely studied because its unique physical and chemical properties which can be an insulator and conductor by doping-dedoping processes and has large potential application. The purpose of this research is to improve the conductivity of LiFePO_4 with conductive polymer PANI. The method is performed by the addition of LiFePO_4 during the polymerization process to form LiFePO_4 polyaniline then added to the C-PANI with the addition of mass percent variation of 5%, 10%, 15%, 20% form-LiFePO_4 composite PANI-C. In LiFePO_4 added during polymerization PANI provide a smooth surface profile after composited with the carbon to LiFePO_4-PANI-C compared to LiFePO_4-C. LiFePO_4-PANI-C composite provided higher conductivity is 18.45×10~(-4) S/cm compared to LiFePO_4-C is 10.48×10~(-4) S/cm at 20% addition of carbon. This is due to PANI in LiFePO_4 is added to the polyaniline polymerization process can act as a conductive adhesive to glue between carbon and LiFePO_4.