We herein report on the ability of fullerene C60and hydrogenated fullerene C60Hx(x∼39) to operate as negative electrodes in novel Na-ion batteries. Building upon the known solubility of C60in common organic electrolytes used in batteries, we developed a suitably optimized solid-state Na-(polyethylene oxide) electrolyte for this application. Electrochemical and structural properties of the fullerene electrodes were investigated through cyclic voltammetry, fixed-current charge/discharge of the electrodes, impedance spectroscopy and powder X-ray diffraction. Both C60and hydrogenated C60have been electrochemically intercalated with sodium. Specific capacities after the first cycle are 250 mAh g−1and 230 mAh g−1for C60and C60Hxrespectively. However, C60electrode shows a strong irreversible character after the first discharge, probably due to the formation of stable polymeric NaxC60phases, where Na+ions diffusion is hindered. On the contrary, C60Hxdisplays better reversibility, suggesting that hydrogenation of the buckyball could be effective to preserve sufficiently large interstitial pathways for Na+diffusion upon intercalation.

Electrochemical intercalation of fullerene and hydrofullerene with sodium / Scaravonati, Silvio; Magnani, G.; Gaboardi, M.; Allodi, G.; Riccò, M.; Pontiroli, D.. - In: CARBON. - ISSN 0008-6223. - 130:(2018), pp. 11-18. [10.1016/j.carbon.2017.12.107]

Electrochemical intercalation of fullerene and hydrofullerene with sodium

SCARAVONATI, SILVIO;Magnani, G.;Gaboardi, M.;Allodi, G.;Riccò, M.;Pontiroli, D.
2018

Abstract

We herein report on the ability of fullerene C60and hydrogenated fullerene C60Hx(x∼39) to operate as negative electrodes in novel Na-ion batteries. Building upon the known solubility of C60in common organic electrolytes used in batteries, we developed a suitably optimized solid-state Na-(polyethylene oxide) electrolyte for this application. Electrochemical and structural properties of the fullerene electrodes were investigated through cyclic voltammetry, fixed-current charge/discharge of the electrodes, impedance spectroscopy and powder X-ray diffraction. Both C60and hydrogenated C60have been electrochemically intercalated with sodium. Specific capacities after the first cycle are 250 mAh g−1and 230 mAh g−1for C60and C60Hxrespectively. However, C60electrode shows a strong irreversible character after the first discharge, probably due to the formation of stable polymeric NaxC60phases, where Na+ions diffusion is hindered. On the contrary, C60Hxdisplays better reversibility, suggesting that hydrogenation of the buckyball could be effective to preserve sufficiently large interstitial pathways for Na+diffusion upon intercalation.
Electrochemical intercalation of fullerene and hydrofullerene with sodium / Scaravonati, Silvio; Magnani, G.; Gaboardi, M.; Allodi, G.; Riccò, M.; Pontiroli, D.. - In: CARBON. - ISSN 0008-6223. - 130:(2018), pp. 11-18. [10.1016/j.carbon.2017.12.107]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2838291
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