Electrochemical activity and high ionic ...
Document type :
Article dans une revue scientifique: Article original
DOI :
Permalink :
Title :
Electrochemical activity and high ionic conductivity of lithium copper pyroborate Li6CuB4O10
Author(s) :
Strauss, Florian [Auteur]
Rousse, Gwenaëlle [Auteur]
Alves Dalla Corte, Daniel [Auteur]
Ben Hassine, Mohamed [Auteur]
Saubanère, Matthieu [Auteur]
Tang, Mingxue [Auteur]
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Courty, Matthieu [Auteur]
Dominko, Robert [Auteur]
Tarascon, Jean-Marie [Auteur]
Rousse, Gwenaëlle [Auteur]
Alves Dalla Corte, Daniel [Auteur]
Ben Hassine, Mohamed [Auteur]
Saubanère, Matthieu [Auteur]
Tang, Mingxue [Auteur]
Vezin, Herve [Auteur]

Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Courty, Matthieu [Auteur]
Dominko, Robert [Auteur]
Tarascon, Jean-Marie [Auteur]
Journal title :
Physical Chemistry Chemical Physics
Abbreviated title :
Phys. Chem. Chem. Phys.
Volume number :
18
Pages :
14960-14969
Publisher :
Royal Society of Chemistry (RSC)
Publication date :
2016-06-14
ISSN :
1463-9076
HAL domain(s) :
Chimie/Chimie théorique et/ou physique
Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]
Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]
English abstract : [en]
In the search for new cathode materials for Li-ion batteries, borate (BO33−) based compounds have gained much interest during the last two decades due to the low molecular weight of the borate polyanions which leads to ...
Show more >In the search for new cathode materials for Li-ion batteries, borate (BO33−) based compounds have gained much interest during the last two decades due to the low molecular weight of the borate polyanions which leads to active materials with increased theoretical capacities. In this context we herein report the electrochemical activity versus lithium and the ionic conductivity of a diborate or pyroborate B2O54− based compound, Li6CuB4O10. By combining various electrochemical techniques with in situ X-ray diffraction, we show that this material can reversibly insert/deinsert limited amounts of lithium (∼0.3 Li+) in a potential window ranging from 2.5 to 4.5 V vs. Li+/Li0. We demonstrate, via electron paramagnetic resonance (EPR), that such an electrochemical activity centered near 4.25 V vs. Li+/Li0 is associated with the Cu3+/Cu2+ redox couple, confirmed by density functional theory (DFT) calculations. Another specificity of this compound lies in its different electrochemical behavior when cycled down to 1 V vs. Li+/Li0 which leads to the extrusion of elemental copper via a conversion type reaction as deduced by transmission electron microscopy (TEM). Lastly, we probe the ionic conductivity by means of AC and DC impedance measurements as a function of temperature and show that Li6CuB4O10 undergoes a reversible structural transition around 350 °C, leading to a surprisingly high ionic conductivity of ∼1.4 mS cm−1 at 500 °C.Show less >
Show more >In the search for new cathode materials for Li-ion batteries, borate (BO33−) based compounds have gained much interest during the last two decades due to the low molecular weight of the borate polyanions which leads to active materials with increased theoretical capacities. In this context we herein report the electrochemical activity versus lithium and the ionic conductivity of a diborate or pyroborate B2O54− based compound, Li6CuB4O10. By combining various electrochemical techniques with in situ X-ray diffraction, we show that this material can reversibly insert/deinsert limited amounts of lithium (∼0.3 Li+) in a potential window ranging from 2.5 to 4.5 V vs. Li+/Li0. We demonstrate, via electron paramagnetic resonance (EPR), that such an electrochemical activity centered near 4.25 V vs. Li+/Li0 is associated with the Cu3+/Cu2+ redox couple, confirmed by density functional theory (DFT) calculations. Another specificity of this compound lies in its different electrochemical behavior when cycled down to 1 V vs. Li+/Li0 which leads to the extrusion of elemental copper via a conversion type reaction as deduced by transmission electron microscopy (TEM). Lastly, we probe the ionic conductivity by means of AC and DC impedance measurements as a function of temperature and show that Li6CuB4O10 undergoes a reversible structural transition around 350 °C, leading to a surprisingly high ionic conductivity of ∼1.4 mS cm−1 at 500 °C.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
CNRS
Collections :
Research team(s) :
Propriétés magnéto structurales des matériaux (PMSM)
Submission date :
2021-06-17T13:38:16Z
2021-06-24T08:26:48Z
2021-06-24T08:26:48Z