title: Significantly Improved Sodium-Ion Storage Performance of CuS Nanosheets Anchored into Reduced Graphene Oxide with Ether-Based Electrolyte.
abstract: Currently sodium-ion batteries (SIBs) as energy storage technology have attracted lots of interest due to their safe, cost-effective, and nonpoisonous advantages. However, many challenges remain for development of SIBs with high specific capacity, high rate capability, and long cycle life. Therefore, CuS as an important earth-abundant, low-cost semiconductor was applied as anode of SIBs with ether-based electrolyte instead of conventional ester-based electrolyte. By incorporating reduced graphene oxide (RGO) into CuS nanosheets and optimizing the cutoff voltage, it is found that the sodium-ion storage performance can be greatly enhanced using ether-based electrolyte. The CuS-RGO composites deliver an initial Coulombic efficiency of 94% and a maximum specific capacity of 392.9 mAh g-1after 50 cycles at a current density of 100 mA g-1. And a specific capacity of 345 mAh g-1is kept after 450 cycles at a current density of 1 A g-1. Such an excellent electrochemical performance is ascribed to the conductive network construction of CuS-RGO composites, the suppression of dissolved polysulfide intermediates by using ether-based electrolyte, and the avoidance of conversion-type reaction by optimizing the cutoff voltage.
authors.affiliation: School of Physics and Materials Science, Engineering Research Center for Nanophotonics & Advanced Instrument, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University , Shanghai 200062, China.
authors.forename: Jinliang
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Physics and Materials Science, Engineering Research Center for Nanophotonics & Advanced Instrument, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University , Shanghai 200062, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Yan
authors.affiliation: School of Physics and Materials Science, Engineering Research Center for Nanophotonics & Advanced Instrument, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University , Shanghai 200062, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, Nanotechnology Research Center, School of Materials Science & Engineering, Sun Yat-sen University , Guangzhou 510275, Guangdong, China.
authors.forename: Wei
authors.identifier: http://orcid.org/0000-0003-2947-6777
authors.initials: W
authors.lastname: Qin
authors.affiliation: School of Physics and Materials Science, Engineering Research Center for Nanophotonics & Advanced Instrument, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University , Shanghai 200062, China.
authors.forename: Yefeng
authors.initials: Y
authors.lastname: Yao
authors.affiliation: School of Physics and Materials Science, Engineering Research Center for Nanophotonics & Advanced Instrument, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University , Shanghai 200062, China.
authors.forename: Likun
authors.identifier: http://orcid.org/0000-0001-9294-1972
authors.initials: L
authors.lastname: Pan
keywords: CuS; cutoff voltage; ether-based electrolyte; reduced graphene oxide; sodium-ion batteries