Large-scale Synthesis of Graphene Microspheres for Superior Potassium-ion Batteries | Apparao M

Summary :
⁣Large-scale, low-cost preparation methods for high-quality graphene are critical for advancing graphene-based applications in energy storage and beyond. Here, we present a sulfur-assisted method that converts benzene rings of tetraphenyltin into high purity crystalline graphene. Specifically, three-dimensional fewlayered graphene microspheres (FLGMs) were prepared, which proved ideal for energy storage applications. For the potassium-ion battery, the FLGM-based anodes exhibited a low discharge platform (average discharge platform about 0.1 V), a high initial capacity of 285 mAh g-1 at 50 mA g-1, and a high rate performance (252 mAh g-1 at 100 mA g-1 and 95 mAh g-1 at 1000 mA g-1). Additionally, the FLGM-based anodes exhibited excellent cycling stability with no capacity loss after 1000 cycles at 200 mA g-1. A process of this nature that does not require substrates and is scalable for continuous or semi-continuous graphene production paves the way for graphenebased energy storage devices.