Development of High Energy Lithium-Ion Batteries through the Anode Side Substitution of Graphite by Si/C Composite

Abstract

In this study, the investigation of high capacity and high efficiency silicon and carbon based electrodes prepared by using a wet chemical manufacturing process is presented. The active material consists of a mixture of a carbon coated silicon composite material and artificial graphite. The electrode provides a reversible capacity of about 1100 mAh⋅g-1 with a coulombic efficiency of about 99% in average for more than 300 cycles. The developed silicon carbon anode is combined with a lithium iron phosphate cathode to build lithium ion batteries. Investigations focus on the influence of the balancing of the anode and cathode in full cells on the electrochemical performance. A full cell on the basis of the developed silicon carbon anode shows improved energy density compared to a graphite-lithium iron phosphate full cell for over more than 200 cycles.