Anchoring nano-sulfur on flat graphene as cathode material for lithium–sulfur battery†
Nano-sulfur anchored on flat graphene (Nano-S/FG) was achieved by a facile hydrothermal method as high performance cathode materials for lithium–sulfur battery. The obtained Nano-S/FG shows flat morphologies dispersed with numerous nano-sized sulfur particles. Remarkably, nanocrystalline sulfur was anchored on the surfaces of graphene with the help of S–O bonds. The resulted Nano-S/FG with sulfur content as high as 75.4% exhibited excellent lithium storage performance with a high specific reversible capacity of 1268 mA h g−1 at the current of 200 mA g−1, and a specific reversible capacity of 536 mA h g−1 even at the high current of 3200 mA g−1. Additionally, the reversible capacity can remain as high as 900 mA h g−1 after 200 cycles. It can be believed that this work supplied a considerable choice for lithium–sulfur battery.