RESEARCH AND FABRICATION OF GRAPHITE/NANOSILIC/NANOCARBONCOMPOSITE FOR ANODE ELECTRODES IN LITHIUM ION BATTERIES

Abstract

Silicon is a potential next generation anode material for lithium- ion batteries because of its high theoritical capacity and abundance in natural. However, its commercial application was hindered by poor electronic conductivity and large volume expansion during electrochemical reactions. In this study, the graphite/nano silicon/nano carbon composite materials were prepared by a facile and low-cost mixing and grinding in solution process as an anode electrode for lithium iron phosphate batteries (LFP). LFP batteries that use anode electrodes with different Si/Graphite ratios are tested using measurements of charge discharge cyclic, differential capacity, and electrochemical impedence spectrum. The results revealed that the addition of silicon nanoporous with a mass ratio of Si:G = 5:95 and 15:85 in the graphite/nanocarbon matrix improved the capacity (charge-discharge energy) of the LFP battery by 100 - 200% respectively compared to the battery using only graphite/nano carbon anode. Although the differential capacity curves represent slight change for silicon nanoporous additional anode, culombic performance still remains more than 92% after 20 cycles. This shows that nano Si has great potential for application in high-capacity li-ion batteries.