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Hollow Carbon Nanofibers Filled with MnO 2 Nanosheets as Efficient Sulfur Hosts for Lithium–Sulfur Batteries
Author(s) -
Li Zhen,
Zhang Jintao,
Lou Xiong Wen David
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201506972
Subject(s) - polysulfide , sulfur , dissolution , electrochemistry , chemical engineering , redox , nanofiber , carbon fibers , materials science , cathode , carbon nanofiber , electrode , lithium (medication) , nanotechnology , chemistry , composite number , inorganic chemistry , carbon nanotube , composite material , electrolyte , metallurgy , medicine , endocrinology , engineering
Lithium–sulfur batteries have been investigated as promising electrochemical‐energy storage systems owing to their high theoretical energy density. Sulfur‐based cathodes must not only be highly conductive to enhance the utilization of sulfur, but also effectively confine polysulfides to mitigate their dissolution. A new physical and chemical entrapment strategy is based on a highly efficient sulfur host, namely hollow carbon nanofibers (HCFs) filled with MnO 2 nanosheets. Benefiting from both the HCFs and birnessite‐type MnO 2 nanosheets, the MnO 2 @HCF hybrid host not only facilitates electron and ion transfer during the redox reactions, but also efficiently prevents polysulfide dissolution. With a high sulfur content of 71 wt % in the composite and an areal sulfur mass loading of 3.5 mg cm −2 in the electrode, the MnO 2 @HCF/S electrode delivered a specific capacity of 1161 mAh g −1 (4.1 mAh cm −2 ) at 0.05 C and maintained a stable cycling performance at 0.5 C over 300 cycles.