Self-conversion templated fabrication of sulfur encapsulated inside the N-doped hollow carbon sphere and 3D graphene frameworks for high-performance lithium–sulfur batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Zengyao Zhang
  • Yonggang Min
  • Guangcheng Yang

Detail(s)

Original languageEnglish
Pages (from-to)900-909
Journal / PublicationElectrochimica Acta
Volume295
Early online date3 Nov 2018
Publication statusPublished - 1 Feb 2019

Abstract

A nanoarchitecture of sulfur encapsulated inside the N-doped hollow carbon sphere and 3D graphene framework (S@NHC-GFW) is designed via a self-conversion template and self-assembly strategy. Herein, ZnS nanospheres serve as scaffold and sulfur source for the formation of 3D graphene frameworks and their subsequent conversion into sulfur through a facile oxidation reaction. Our self-template conversion route for in situ encapsulation of sulfur inside a carbon shell can prevent the aggregation of sulfur and effectively control uniformity. Hollow carbon nanostructure offers an internal void space, which can accommodate the volumetric change in sulfur upon lithiation. N-doped carbon shell serves as a physical barrier and offers active sites for the chemical adsorption of polysulfides, thereby effectively alleviating the loss of polysulfides. In addition, graphene introduction in the construction of a 3D conductive network interconnected with different S@NHC spheres under plane-to-point mode is beneficial to the continuous transfer of electrons in different dimensions. Consequently, the conductivity of the whole electrode increases. Given these advantages, S@NHC-GFW can serve as a cathode with a good rate capability and an excellent long-term cycling stability.

Research Area(s)

  • Graphene framework, Hollow carbon sphere, Li-S batteries, N doping, Sulfur cathode

Citation Format(s)

Self-conversion templated fabrication of sulfur encapsulated inside the N-doped hollow carbon sphere and 3D graphene frameworks for high-performance lithium–sulfur batteries. / Cai, Junjie; Zhang, Zengyao; Yang, Shaoran; Min, Yonggang; Yang, Guangcheng; Zhang, Kaili.

In: Electrochimica Acta, Vol. 295, 01.02.2019, p. 900-909.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review