Carbon Nanotube-Connected Yolk-Shell Carbon Nanopolyhedras with Cobalt and Nitrogen Doping as Sulfur Immobilizers for High-Performance Lithium-Sulfur Batteries

Ruiqing Liu, Qi Kang, Wenhui Liu, Zhiwei Liu, Yuejiao Liu, Yizhou Wang, Jianyu Chen, Benjamin Hultman, Xiujing Lin, Yi Li, Pan Li, Zhendong Huang, Xiaomiao Feng, Gang Wu*, Leshu Yu, Yanwen Ma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The lithium sulfur battery is regarded as a promising energy solution because of its high energy density. However, the insulating nature and large volumetric expansion of sulfur and the high solubility of polysulfides restrict their practical applications. Here carbon nanotube (CNT)-induced yolk-shell carbon nanopolyhedra, with Co-N-doping, is used as host material for sulfur. The CNTs are used to create a conductive network which interweaves each carbon polyhedron and induces the formation of a yolk-shell structure during the sulfur melt-diffusion process due to the "perforation effect". The CNT-connected Co-N-doped carbon nanopolyhedra containing sulfur yolk-shell structure (S@Co-N-C/CNTs-0.5) can achieve a capacity of 712.2 mAh g-1 at 1675 (1 C) mA g-1 after 300 cycles and 511.8 mAh g-1 at 3350 (2 C) mA g-1. The outstanding performance is attributed to the new paradigm, S@Co-N-C/CNTs-0.5 yolk-shell structure, which creates a conductive network allowing for improved electron transport and convenient electrolyte infiltration, as well as enhanced reaction kinetics for the electrochemical process synchronously. The significant internal void space of yolk-shell structure effectively accommodates the volume expansion of sulfur. Simultaneously, Co-N-doping in yolk-shell structure carbon polyhedra can synergistically trap polysulfides due to the strong chemical adsorption.

Original languageEnglish (US)
Pages (from-to)6487-6496
Number of pages10
JournalACS Applied Energy Materials
Issue number11
StatePublished - Nov 26 2018

Bibliographical note

Funding Information:
This work was supported by the NSFC (51772157, 21805140, 61504062, 51802161), Priority Academic Program Development of Jiangsu Higher Education Institutions (YX03001), NSF of Jiangsu Province (BK20160890, BK20160886), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Synergetic Innovation Center for Organic Electronics and Information Displays, Jiangsu Province “Six Talent Peak” (2015-JY-015), Qing Lan Project of Jiangsu Province, Natural Science Key Project of Jiangxi Province (2017ACB20040) and NUPT (NY215014, NY215152), National Science Foundation (CBET-1511528, 1604392) and the Sustainable Manufacturing and Advanced Robotics Technology (SMART) Community of Excellence program at the University at Buffalo, SUNY.

Publisher Copyright:
© Copyright 2018 American Chemical Society.


  • carbon nanotube
  • chemical adsorption
  • lithium-sulfur batteries
  • metal organic frameworks
  • yolk-shell carbon nanopolyhedra

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering


Dive into the research topics of 'Carbon Nanotube-Connected Yolk-Shell Carbon Nanopolyhedras with Cobalt and Nitrogen Doping as Sulfur Immobilizers for High-Performance Lithium-Sulfur Batteries'. Together they form a unique fingerprint.

Cite this