| 초록 |
Today, graphite is the most popular anode material in Li-ion battery, due to its high reversibility and stable capacity. However, the theoretical capacity is small as 372mAh/g and there are growing needs to improve the specific capacity by replacing the graphite with new anode materials. Silicon is the most promising candidate, because the theoretical capacity is ~4200mAh/g. However, it suffers from the large volume change over 300% during lithiation/de-lithiation, which results in cracking and capacity loss. In present study, we have developed the surface functionalized silicon nanoparticles (SiNPs) as the new anode materials. The surface layers not only provide the ability to control the spacing between SiNPs but also significantly restrain the deformation of SiNPs during cycling. The cycle behavior of new anodes was characterized by galvanostatic methods and the morphological changes of SiNPs during cycling were investigated by ex-situ FIB-TEM and XRD experiments. |
