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63 results on '"Ajuria, Jon"'

51. High Performance Titanium Antimonide TiSb2Alloy for Na-Ion Batteries and Capacitors

Author

Arnaiz, María, Gómez-Cámer, Juan Luis, Ajuria, Jon, Bonilla, Francisco, Acebedo, Begoña, Jáuregui, María, Goikolea, Eider, Galceran, Montserrat, and Rojo, Teófilo

Abstract

Herein, we report for the first time the use of TiSb2alloy as anode material for sodium-ion batteries (NIBs) and capacitors (NICs). The electrochemical performance of TiSb2in NIBs shows stable cycling with a capacity of about 225 mAh·g–1for 200 cycles. Discrepancies with the expected theoretical specific charge are discussed by means of operando XRD and ex situ TEM analysis. The excellent rate capability enables the use of TiSb2in NICs, achieving promising high energy densities of 132 Wh·kg–1at 114 W·kg–1and 65 Wh·kg–1at 11 kW·kg–1, which are among the best reported values for alloying materials in NICs. However, due to the well-known problem of volume changes upon cycling of alloying materials, the capacity retention needs to be improved. Using cross-linked functional binders as carboxymethyl cellulose–poly(acrylic acid) we enhanced the retention after 1000 cycles from 10% to 63%, paving the way to develop new high-performance anodes for NICs.

Published
2018
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60. Hybrid Proton-Conducting Membranes as Fuel Cells Solid Polyelectrolytes

Author

Alberto Blázquez, J., Mecerreyes, David, Miguel, Oscar, Rodriguez, Javier, Cendoya, Ione, Ajuria, Jon, Iruin, Juan J., Ignacio Santos, J., Marestin, Catherine, and Mercier, Régis

Abstract

A series of novel hybrid organic-inorganic membranes based on sulfonated naphthalimides and phosphotungstic acid N-methylpyrrolidone were prepared from a NMP solution. These materials, composed of two proton-conducting components, have good mechanical properties, high ionic conductivities (10.5×10−2S∕cm at 80°C) and good fuel cell performances at 70°C.

Published
2006
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62. Uso de tecnologías de la información y comunicación para mejorar la adherencia al tratamiento en pacientes con enfermedades crónicas en atención primaria

Author

Sáiz Manzanares, María Consuelo, Universidad de Burgos. Departamento de Ciencias de la Salud, Andrés Pérez, Laura, Asturias Ajuria, Jon Ander, Bustamante Torres, Graciela, Caminero López, Carlos, Corbacho Rodríguez, Ziortza, Sáiz Manzanares, María Consuelo, Universidad de Burgos. Departamento de Ciencias de la Salud, Andrés Pérez, Laura, Asturias Ajuria, Jon Ander, Bustamante Torres, Graciela, Caminero López, Carlos, and Corbacho Rodríguez, Ziortza

63. How Does Li 2 C 4 O 4 Prelithiation Additive Influence the Solid Electrolyte Interphase of Dual Carbon Lithium-Ion Capacitors?

Author

Granados-Moreno M, Cid R, Arnaiz M, Goikolea E, and Ajuria J

Abstract

Prelithiation is a critical step in dual carbon lithium-ion capacitors (LICs) due to the lack of Li + in the system, which needs to be incorporated externally to avoid electrolyte depletion. Several prelithiation techniques have been developed over the years, and recently, dilithium squarate (Li 2 C 4 O 4 ) has been reported as an air-stable, easy to synthesize, safe, and cost-effective prelithiation reagent for LICs. Li 2 C 4 O 4 has successfully been used in a wide range of chemistries, and its integration into positive electrodes has been scaled up to roll-to-roll processing and demonstrated in multilayer pouch cells. However, its influence in the solid electrolyte interphase (SEI) has not yet been studied. In this work, the SEI formed on the hard carbon (HC) negative electrode when using Li 2 C 4 O 4 as a prelithiation agent has been studied by X-ray photoelectron spectroscopy (XPS). The electrode surface has been analyzed in the lithiated and delithiated states along the first lithiation cycle, as well as at the end of the prelithiation protocol, to gain insight into the SEI formation and evolution during the prelithiation process. In addition, an aging test has been carried out to study the long-term SEI stability. We have observed that the use of Li 2 C 4 O 4 induces a chemical modification in the composition of the SEI with respect to the SEI that forms by using a standard electrochemical prelithiation process, resulting in a less soluble interface. Therefore, the chemical composition of the SEI is stable over cycling. Those findings confer to Li 2 C 4 O 4 the ability to tune the SEI of the devices, enabling its use in LICs and LIBs not only as a prelithiation agent but also as a film-forming additive.

Published
2024
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