Effect of the number of layers of multilayer graphene synthesized by ultrasonic exfoliation method on the electrode performance of SiO anode

Abstract In this study, multilayer graphene produced by ultrasonic crushing method was applied as a conductive aid for SiO anode. The SiO anode with multilayer graphene was superior in all cycle, high-rate charge, and high-rate discharge properties, although the resistivity of the active material layer was slightly higher than that with conventional AB. These properties are understood to be due not only to the electronic conductivity of graphene, but also to effects based on its shape. Comparing two types of multilayer graphene with different number of layers produced by the same manufacturing method, it was confirmed that the graphene with fewer layers was superior in cycle(Sustain initial capacity in XP), high-rate-of-charge(after 2.0C charge capacitance in XP is 1.5 times larger than that of AB), and high-rate-of-discharge properties e(after 2.0C discharge capacitance in XP is 1.3 times larger than that of AB). This may be due to the difference in the number of conductive paths formed within the active material layer due to the difference in the number of graphene particles per weight.