Hard carbon as a negative electrode material for potassium-ion batteries prepared with high yield through a polytetrafluoroethylene-based precursor

Elena N. Abramova, Nazerke Marat, Dmitry P. Rupasov, Polina A. Morozova, Maria A. Kirsanova, Artem M. Abakumov

Research output: Contribution to journalArticlepeer-review

Abstract

A new additive (polytetrafluoroethylene, PTFE) to typical sugar precursors for hard carbon (HC) preparation via hydrothermal carbonization has been proposed and investigated. The HC samples obtained from sugars (D-glucose and pectin) with and without PTFE were characterized with X-ray powder diffraction, Raman spectroscopy, scanning and transmission electron microscopy, energy-dispersive X-ray and electron energy loss spectroscopy, specific surface area measurements. Adding PTFE to sugars significantly improves the HC yield from <10% to 28% per total precursor mass as PTFE pyrohydrolysis generates small hollow HC nanospheres of 200-250 nm in diameter which then act as seeds for carbonization of sugars. Employing the PTFE additives improves discharge capacity (285 mAh/g at C/10 charge/discharge rate), enhances rate capability (232 mAh/g at 1C charge/discharge rate) and cycling stability of HC as a negative electrode material for potassium-ion batteries that has been tested in both potassium half-cell and potassium-ion full cell configurations.

Original languageEnglish
Article number100089
JournalCarbon Trends
Volume5
DOIs
Publication statusPublished - Oct 2021

Keywords

  • Electrode materials
  • Hard carbon
  • Negative electrode
  • Potassium-ion batteries
  • Synthesis

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