| Autor: |
Zarrabeitia M; CIC Energigune , Parque Tecnológico de Álava , Albert Einstein 48 , 01510 Miñano , Spain.; Helmholtz Institute Ulm (HIU) , Helmholtzstrasse 11 , 89081 Ulm , Germany.; Karlsruhe Institute of Technology (KIT) , P.O. Box 3640, 76021 Karlsruhe , Germany., Gomes Chagas L; Helmholtz Institute Ulm (HIU) , Helmholtzstrasse 11 , 89081 Ulm , Germany.; Karlsruhe Institute of Technology (KIT) , P.O. Box 3640, 76021 Karlsruhe , Germany., Kuenzel M; Helmholtz Institute Ulm (HIU) , Helmholtzstrasse 11 , 89081 Ulm , Germany.; Karlsruhe Institute of Technology (KIT) , P.O. Box 3640, 76021 Karlsruhe , Germany., Gonzalo E; CIC Energigune , Parque Tecnológico de Álava , Albert Einstein 48 , 01510 Miñano , Spain., Rojo T; CIC Energigune , Parque Tecnológico de Álava , Albert Einstein 48 , 01510 Miñano , Spain.; Departamento de Química Inorgánica , Universidad del País Vasco UPV/EHU , P.O. Box 664, 48080 Leioa , Spain., Passerini S; Helmholtz Institute Ulm (HIU) , Helmholtzstrasse 11 , 89081 Ulm , Germany.; Karlsruhe Institute of Technology (KIT) , P.O. Box 3640, 76021 Karlsruhe , Germany., Muñoz-Márquez MÁ; CIC Energigune , Parque Tecnológico de Álava , Albert Einstein 48 , 01510 Miñano , Spain. |
| Abstrakt: |
The electrochemical properties of P2-Na 2/3 Mn 0.8 Fe 0.1 Ti 0.1 O 2 layered oxide, which is a promising cathode material for rechargeable Na-ion batteries (NIBs), are evaluated with an optimized in-house ionic liquid (IL)-based electrolyte, and its performance is compared with that using carbonate-based electrolyte. The IL-based system reveals better electrochemical performance at room temperature than the carbonate electrolyte-based one at 0.1C and 1C, especially in terms of cycling stability, with a 97% capacity retention after 100 deep cycles (0.1C). The electrode/electrolyte interface is thoroughly studied in both systems by means of X-ray photoelectron spectroscopy and scanning electron microscopy so as proof that the formed interface is crucial to optimizing the electrochemical performance of NIBs. The carbonate-based system shows a thin, inhomogeneous, and unstable interface layer, while the IL-based one exhibits an even thinner but homogeneous and more stable interface, which may result in safer and longer-lasting NIBs. |
