PNNL

Abstract

Si and SnO2 are good high capacity anode materials for Li-ion batteries, but usually show rapid capacity fading during charge/discharge cycles due to large volume expansion and phase transformation upon lithiation and de-lithiation. Low conductivity and poor stability of such materials usually require the addition of conductive phases to enhance electrons transport and electrical contact of the active materials in the electrode of Li-ion battery. For example, high capacity in SnO2/C composites, but capacity fading is still significant in these studies. Good capacity retention could be obtained only when\ a much larger amount of carbon (above 60 wt %) was added in the electrode. To increase the capacity of the anode, a novel anode need to be developed which has a capacity which is more than double of those of state of the art graphite anode.