Regensburg 2022 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 13: Non-equilibrium Phenomena in Materials Induced by Electrical and Magnetic Fields 3

MM 13.4: Vortrag

Dienstag, 6. September 2022, 11:45–12:00, H45

PECVD carbon-coated electrospun vanadium pentoxide nanofibers as cathode material for photoresponsive batteries — •Michael Wilhelm, Ruth Adam, Aman Bhardwaj, and Sanjay Mathur — University of Cologne, Cologne, Germany

Harvesting and converting sunlight as the most sustainable energy source on earth is still challenging. Photo-rechargeable batteries represent a synergistic concept that integrates both energy harvesting and energy storage modalities based on dual-functional materials. Vanadium pentoxide nanofibers (VNF) as photoresponsive material was synthesized by electric field-assisted spinning technique and used as dual-action cathode material for photo-rechargeable lithium-ion batteries. A high discharge capacity was delivered, which could be increased under light illumination confirming the photoresponsive behavior. To minimize side reactions and to increase the stability of the electrodes, the VNF were carbon-coated by plasma-enhanced chemical vapor deposition (PECVD). Long-term stability tests showed that besides being a conductive shell, the carbon coating is also essential in retaining the structural instability of VNF. Higher capacity retention upon cycling compared to the non-carbon-coated VNF (after 300 cycles: 43.85 % capacity retention VNF and 61.13 % capacity retention for carbon-coated VNF). Further, the rechargeability of the material by light was demonstrated by illuminating with a UV lamp and afterward discharging the electrode material in the dark which delivered a photoconversion efficiency of 4.24 % for VNF and 5.07 % for carbon-coated VNF.