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Sulfur‐Immobilized Nitrogen and Oxygen Co–Doped Hierarchically Porous Biomass Carbon for Lithium‐Sulfur Batteries: Influence of Sulfur Content and Distribution on Its Performance
Author(s) -
Chulliyote Reshma,
Hareendrakrishnakumar Haritha,
Raja Murugan,
Gladis Joseph Mary,
Stephan Arul Manuel
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702061
Subject(s) - sulfur , carbon fibers , polysulfide , chemical engineering , heteroatom , materials science , nitrogen , lithium–sulfur battery , inorganic chemistry , chemistry , electrode , electrochemistry , organic chemistry , composite material , composite number , metallurgy , electrolyte , ring (chemistry) , engineering
Hierarchically porous carbon with inherently doped heteroatoms and the quantity of active material (sulfur) confined within this carbon matrix play a major role for the high performance of Li−S batteries. Herein, we discuss the influence of sulfur content and distribution onto the N and O co‐doped hierarchically porous biomass carbon matrix (PC) to achieve high specific capacitance and cycling stability. Sulfur encapsulated PC was prepared from an eco‐friendly source with a high surface area of 2065 m 2 g −1 and a pore volume of 1.5 cm 3 g −1 . PC with 54, 68 & 73% of sulfur content (PCSCs) have been investigated as cathode materials for Li−S battery. PC with 54% sulfur displayed better performance with an initial discharge capacity of 1606 mA h g −1 and a cycling stability of 1269 mA h g −1 at 0.1C rate after 100 cycles due to better dispersion of sulfur in the porous architecture. The higher cycling stability of PCSC (54%) is due to the N and O co‐doped hierarchical porous carbon layers, enhancing the sulfur utilization ratio and mitigating the polysulfide shuttle during the cycling process.