Effect of Carbon Source as Additives in LiFePO[sub 4] as Positive Electrode for Lithium-Ion Batteries

Abstract

The electrochemical properties of cathodes with different carbon contents were studied to determine the role of carbon as conductive additive. cathodes containing from 0 to 12% of conductive additive (carbon black or mixture of carbon black and graphite) were cycled at different C rates. The capacity of the cathode increased as conductive additive content increased. Carbon increased the utilization of active material and the electrical conductivity of electrode, but decreased volumetric capacity of electrode. This composition ( with 3 wt % of carbon and 3 wt % of Graphite) is suitable for HEV application.