Novel Sulfur Host Composed of Cobalt and Porous Graphitic Carbon Derived from MOFs for the High-Performance Li–S Battery - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue ACS Applied Materials & Interfaces Année : 2018

Novel Sulfur Host Composed of Cobalt and Porous Graphitic Carbon Derived from MOFs for the High-Performance Li–S Battery

Yan-Qiu Lu
  • Fonction : Auteur
Yi-Jin Wu
  • Fonction : Auteur
Tian Sheng
  • Fonction : Auteur
Xin-Xing Peng
  • Fonction : Auteur
Zhen-Guang Gao
  • Fonction : Auteur
Shao-Jian Zhang
  • Fonction : Auteur
Li Deng
  • Fonction : Auteur
  • PersonId : 1012907
Rui Nie
  • Fonction : Auteur
Jun-Tao Li
  • Fonction : Auteur
Ling Huang
Xiao-Dong Zhou
  • Fonction : Auteur
Shi-Gang Sun

Résumé

A composite consisting of cobalt and graphitic porous carbon (Co@ GC-PC) is synthesized from bimetallic metal−organic frameworks and employed as the sulfur host for high-performance Li−S batteries. Because of the presence of a large surface area (724 m 2 g −1) and an abundance of macro-/mesopores, the Co@ GC-PC electrode is able to alleviate the debilitating effect originating from the volume expansion/contraction of sulfur species during the cycling process. Our in situ UV/vis analysis indicates that the existence of Co@GC-PC promotes the adsorption of polysulfides during the discharge process. Density functional theory calculations show a strong interaction between Co and Li 2 S and a low decomposition barrier of Li 2 S on Co(111), which is beneficial to the following Li 2 S oxidation in the charge process. As a result, at 0.2C, the discharge capacity of the S/Co@GC-PC cathode is stabilized at 790 mAh g −1 after 220 cycles, much higher than that of a carbon-based cathode, which delivers a discharge capacity of 188 mAh g −1.
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Dates et versions

hal-02325658 , version 1 (06-11-2019)

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Yan-Qiu Lu, Yi-Jin Wu, Tian Sheng, Xin-Xing Peng, Zhen-Guang Gao, et al.. Novel Sulfur Host Composed of Cobalt and Porous Graphitic Carbon Derived from MOFs for the High-Performance Li–S Battery. ACS Applied Materials & Interfaces, 2018, 10 (16), pp.13499-13508. ⟨10.1021/acsami.8b00915⟩. ⟨hal-02325658⟩
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