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Synthesis of CoS 2 Nanoparticles/Nitrogen‐Doped Graphitic Carbon/Carbon Nanotubes Composite as an Advanced Anode for Sodium‐Ion Batteries
Author(s) -
Li Yong,
Guo Rui,
Sun Yanting,
Wang Yong,
Liu Wen,
Pei Haijuan,
Zhao Hongbin,
Zhang Jiujun,
Ye Daixin,
Xie Jingying,
Kong Jilie
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201902053
Subject(s) - anode , materials science , carbon nanotube , carbon fibers , nanoparticle , chemical engineering , electrochemistry , composite number , current density , nanotechnology , doping , sodium ion battery , electrode , cobalt sulfide , composite material , optoelectronics , faraday efficiency , chemistry , physics , quantum mechanics , engineering
Cobalt sulfide (CoS 2 ) is a promising anode material for high‐performance sodium‐ion batteries (SIBs) because of its low cost, excellent electrical conductivity, and high theoretical capacity. The practical implementation of a CoS 2 anode, however, is still hindered by fast capacity decay and low power density caused by its huge volume expansion during the charging/discharging process. Herein, we developed a low‐cost, facile and large‐scale method to fabricate a nitrogen‐doped carbon‐layer‐constrained structured CoS 2 /carbon nanotubes (NC@CoS 2 @CNTs) hybrid with a novel morphology for high‐performance SIBs. The hybrid electrode has reversible specific capacities of 669 and 334 mAh g −1 at the current densities of 200 mA g −1 and 5000 mA g −1 , respectively, and an unprecedented cycling stability of approximately 0.014 % capacity decay per cycle over 1000 cycles at 3000 mA g −1 . The balanced high electrochemical performance for the hybrid electrode can be attributed to the synergetic effect among the CoS 2 nanoparticles, N‐doped carbon coating and in situ grown CNTs. The results demonstrate that the CoS 2 can be well utilized with the N‐doped carbon/carbon nanotubes hybrid material structure, which provides a facile approach to realize excellent performance for practical applications.