Conductive porous vanadium nitride/graphene composite as chemical anchor of polysulfides for lithium-sulfur batteries

Zhenhua Sun, Jingqi Zhang, Lichang Yin, Guangjian Hu, Ruopian Fang, Hui-Ming Cheng and Feng Li ()
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Zhenhua Sun: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Jingqi Zhang: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Lichang Yin: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Guangjian Hu: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Ruopian Fang: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Hui-Ming Cheng: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Feng Li: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Although the rechargeable lithium–sulfur battery is an advanced energy storage system, its practical implementation has been impeded by many issues, in particular the shuttle effect causing rapid capacity fade and low Coulombic efficiency. Herein, we report a conductive porous vanadium nitride nanoribbon/graphene composite accommodating the catholyte as the cathode of a lithium–sulfur battery. The vanadium nitride/graphene composite provides strong anchoring for polysulfides and fast polysulfide conversion. The anchoring effect of vanadium nitride is confirmed by experimental and theoretical results. Owing to the high conductivity of vanadium nitride, the composite cathode exhibits lower polarization and faster redox reaction kinetics than a reduced graphene oxide cathode, showing good rate and cycling performances. The initial capacity reaches 1,471 mAh g−1 and the capacity after 100 cycles is 1,252 mAh g−1 at 0.2 C, a loss of only 15%, offering a potential for use in high energy lithium–sulfur batteries.

Date: 2017
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DOI: 10.1038/ncomms14627

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