文摘
Decreasing particle size has always been reported to be an efficient way to improve cyclability of Li-alloying based LIBs. However, nanoparticles (NPs) tend to agglomerate and evolve into lumps, which in turn limits the cycling performance. In this report, we prepared a unique nanostructure, graphene-coated Ge NPs are highly dispersed on vertically aligned graphene (Ge@graphene/VAGN), to avoid particle agglomeration and pulverization. Remarkable structure stability of the sample leads to excellent cycling stability. Upon cycling, the anode exhibits a high capacity of 1014 mAh g鈥?, with nearly no capacity loss in 90 cycles. Rate performance shows that even at the high current density of 13 A g鈥?, the anode could still deliver a higher capacity than that of graphite.
Keywords:
lithium-ion batteries; Ge NPs; graphene coating; binder free; vertically aligned graphene; cyclability
