A High-Volumetric-Capacity Cathode Based on Interconnected Close-Packed N-Doped Porous Carbon Nanospheres for Long-Life Lithium–Sulfur Batteries

Cheng Hu, Caroline Kirk, Qiong Cai, Carlos Cuadrado-Collados, Joaquín Silvestre-Albero, Francisco Rodríguez-Reinoso, Mark James Biggs

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

This study reports a Li–S battery cathode of high volumetric capacity enabled by novel micro- and mesostructuring. The cathode is based on monodisperse highly porous carbon nanospheres derived from a facile template- and surfactant-free method. At the mesoscale, the nanospheres structure into interconnected close-packed clusters of a few microns in extent, thus facilitating the fabrication of dense crack-free high areal sulfur loading (5 mg cm−2) cathodes with high electrical conductivity and low cathode impedance. A combination of the nitrogen doping (5 wt%), high porosity (2.3 cm3 g−1), and surface area (2900 m2 g−1) at the microscale enables high sulfur immobilization and utilization. The cathode delivers among the best reported volumetric capacity to date, above typical Li-ion areal capacity at 0.2 C over 200 cycles and low capacity fading of 0.1% per cycle at 0.5 C over 500 cycles. The compact cathode structure also ensures a low electrolyte requirement (6 µL mg−1), which aids a low overall cell weight, and further, among the best gravimetric capacities published to date as well.

Original languageEnglish
Article number1701082
JournalAdvanced Energy Materials
Volume7
Issue number22
Early online date21 Aug 2017
DOIs
Publication statusPublished - 22 Nov 2017

Keywords

  • close packed
  • high volumetric capacity
  • interconnected carbon nanospheres
  • Li–S batteries
  • monodisperse

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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