title: Sandwich-type functionalized graphene sheet-sulfur nanocomposite for rechargeable lithium batteries.
abstract: A functionalized graphene sheet-sulfur (FGSS) nanocomposite was synthesized as the cathode material for lithium-sulfur batteries. The structure has a layer of functionalized graphene sheets/stacks (FGS) and a layer of sulfur nanoparticles creating a three-dimensional sandwich-type architecture. This unique FGSS nanoscale layered composite has a high loading (70 wt%) of active material (S), a high tap density of ∼0.92 g cm(-3), and a reversible capacity of ∼505 mAh g(-1) (∼464 mAh cm(-3)) at a current density of 1680 mA g(-1) (1C). When coated with a thin layer of cation exchange Nafion film, the migration of dissolved polysulfide anions from the FGSS nanocomposite was effectively reduced, leading to a good cycling stability of 75% capacity retention over 100 cycles. This sandwich-structured composite conceptually provides a new strategy for designing electrodes in energy storage applications.
authors: Pacific Northwest National Laboratory, Richland, WA 99352, USA.
authors: Yuliang
authors: Y
authors: Cao
authors: Xiaolin
authors: X
authors: Li
authors: Ilhan A
authors: IA
authors: Aksay
authors: John
authors: J
authors: Lemmon
authors: Zimin
authors: Z
authors: Nie
authors: Zhenguo
authors: Z
authors: Yang
authors: Jun
authors: J
authors: Liu