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Self‐Polymerized Disordered Carbon Enabling High Sodium Storage Performance through Expanded Interlayer Spacing by Bound Sulfur Atoms
Author(s) -
Li Wei,
Wang Kangli,
Cheng Shijie,
Jiang Kai
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800962
Subject(s) - sulfur , pyrolytic carbon , carbon fibers , materials science , anode , intercalation (chemistry) , doping , chemical engineering , conductivity , inorganic chemistry , pyrolysis , composite number , chemistry , electrode , composite material , optoelectronics , engineering , metallurgy
An effective strategy to fabricate sulfur‐doped carbon with tunable doping sites is developed using a one‐step pyrolytic technique. Applied as Na‐storage anode, this sulfur‐doped carbon exhibits high reversible capacity, excellent rate capability (330 mAh g −1 at 0.02 A g −1 and 158 mAh g −1 at 5 A g −1 ), as well as superior durability (159 mAh g −1 over 10000 cycles at 2 A g −1 with 95.7 % retention). Experimental characterization and theoretical calculation reveal that interlayer C−S−C bonds not only expand the d 002 spacing, but also provide an alternative pathway for electron transport. This improves Na + ion intercalation/deintercalation capability and electronic conductivity.