Metal-organic framework MIL-101(Fe)–NH2 as an efficient host for sulphur storage in long-cycle Li–S batteries

D. Capková, M. Almáši, T. Kazda, O. Čech, N. Király, P. Čudek, A. Straková Fedorková, V. Hornebecq

Research output: Contribution to journalArticlepeer-review

Abstract

Porous metal-organic framework (MOF) MIL-101(Fe)–NH2 was synthesized, characterized and used as a host material for sulphur in the context of lithium-sulphur batteries. The MIL-101(Fe)–NH2 support possessed, a large surface area, close to 3500 m2 g−1, and mild framework stability up to 120 °C. As the framework stability strongly depends on the presence of guests in the micro/mesoporous cages, conditions for sulphur inclusion process were carefully selected, and then the material was further carbonized. MOF as a conductive part of cathode material displayed successful sulphur capture and encapsulation. The encapsulation of sulphur was accompanied by highly stable charge/discharge cycle performances and high efficiency. Consequently, the cathode showed at a current rate 0.5C a high initial discharge capacity of 705 mA h g−1 and after 200 cycles of 476 mA h g−1, corresponding to a low fading rate of 0.162% per cycle. The capacity of the cycle after self-discharge was 94.8% of the capacity in the cycle before self-discharge.

Original languageEnglish
Article number136640
JournalElectrochimica Acta
Volume354
DOIs
Publication statusPublished - 10 Sep 2020
Externally publishedYes

Keywords

  • Electrochemical energy storage
  • Lithium-sulphur batteries
  • Metal-organic framework
  • MIL-101(Fe)–NH

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