Array of nanosheets render ultrafast and high-capacity Na-ion storage by tunable pseudocapacitance.

ABSTRACT: Sodium-ion batteries are a potentially low-cost and safe alternative to the prevailing lithium-ion battery technology. However, it is a great challenge to achieve fast charging and high power density for most sodium-ion electrodes because of the sluggish sodiation kinetics. Here we demonstrate a high-capacity and high-rate sodium-ion anode based on ultrathin layered tin(II) sulfide nanostructures, in which a maximized extrinsic pseudocapacitance contribution is identified and verified by kinetics analysis. The graphene foam supported tin(II) sulfide nanoarray anode delivers a high reversible capacity of ?1,100?mAh?g(-1) at 30?mA?g(-1) and ?420?mAh?g(-1) at 30?A?g(-1), which even outperforms its lithium-ion storage performance. The surface-dominated redox reaction rendered by our tailored ultrathin tin(II) sulfide nanostructures may also work in other layered materials for high-performance sodium-ion storage.

SUBMITTER: Chao D 

PROVIDER: S-EPMC4931321 | biostudies-literature | 2016 Jun

REPOSITORIES: biostudies-literature