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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
