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6. Tailoring ionic-electronic transport in PEO-Li4C60: Towards a new class of all solid-state mixed conductors

Author

Cattaneo, A, Dall'Asta, V, Pontiroli, D, Riccò, M, Magnani, G, Milanese, C, Tealdi, C, Quartarone, E, Mustarelli, P, Cattaneo, AS, Cattaneo, A, Dall'Asta, V, Pontiroli, D, Riccò, M, Magnani, G, Milanese, C, Tealdi, C, Quartarone, E, Mustarelli, P, and Cattaneo, AS

Abstract

Mixed ionic-electronic conductors (MIEC) are of growing interest for fuel cells, batteries and sensors. Here, by exploiting the unique properties of Li4C60 2D fulleride and poly(ethylene oxide) (PEO), we demonstrate the feasibility of a MIEC where the nature of transport can be tuned from ionic, to mixed, to almost entirely electronic, simply by changing the weight ratio of the two basic components. By coupling 7Li MAS-NMR, electrochemical impedance spectroscopy and open circuit voltage (OCV) measurements of a Li/composite/LiFePO4 cell we demonstrate that: i) a fraction of Li+ ions is extracted by Li4C60 and confined into PEO amorphous strands similarly to what happens in PEO-salt systems; ii) a transition between prevalently ionic and electronic conductivity takes place at 33 wt% Li4C60. This new class of MIEC is very promising for the design of both chemically and electrochemically stable semi-cells and interfaces which can be employed in batteries and supercapacitors.

Published
2016

7. Tailoring ionic-electronic transport in PEO-Li4C60: Towards a new class of all solid-state mixed conductors

Author

Alice S. Cattaneo, Valentina Dall'Asta, Mauro Riccò, Daniele Pontiroli, Cristina Tealdi, Giacomo Magnani, Piercarlo Mustarelli, Eliana Quartarone, Chiara Milanese, Cattaneo, A, Dall'Asta, V, Pontiroli, D, Riccò, M, Magnani, G, Milanese, C, Tealdi, C, Quartarone, E, and Mustarelli, P

Subjects
Supercapacitor, Materials science, Ethylene oxide, Open-circuit voltage, Composite number, Chemistry (all), Ionic bonding, Nanotechnology, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Dielectric spectroscopy, Amorphous solid, Ion, chemistry.chemical_compound, chemistry, Chemical engineering, General Materials Science, 0210 nano-technology
Abstract

Mixed ionic-electronic conductors (MIEC) are of growing interest for fuel cells, batteries and sensors. Here, by exploiting the unique properties of Li 4 C 60 2D fulleride and poly(ethylene oxide) (PEO), we demonstrate the feasibility of a MIEC where the nature of transport can be tuned from ionic, to mixed, to almost entirely electronic, simply by changing the weight ratio of the two basic components. By coupling 7 Li MAS-NMR, electrochemical impedance spectroscopy and open circuit voltage (OCV) measurements of a Li/composite/LiFePO 4 cell we demonstrate that: i) a fraction of Li + ions is extracted by Li 4 C 60 and confined into PEO amorphous strands similarly to what happens in PEO-salt systems; ii) a transition between prevalently ionic and electronic conductivity takes place at 33 wt% Li 4 C 60 . This new class of MIEC is very promising for the design of both chemically and electrochemically stable semi-cells and interfaces which can be employed in batteries and supercapacitors.

Published
2016

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