Publication: Influencia de la adición de Li(subíndice 2)CO(subíndice 3) en las propiedades eléctricas del conductor iónico de litio Li(subíndice 5)La(subíndice 3)Nb (subíndice 2)O(subíndice 12)
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2015-09
Defense date
2015-10-16
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Abstract
Debido al creciente desarrollo de dispositivos electrónicos y otros productos que requieren el
uso de una batería eléctrica, el estudio, desarrollo y mejora de las propiedades de las mismas es uno
de los principales objetivos hoy en día para optimizar el funcionamiento de dichos dispositivos.
El presente trabajo recoge el estudio del efecto de la adición de diferentes excesos de Li2CO3
al conductor iónico con estructura tipo granate y con composición Li5La3Nb2O12 para su posible
aplicación como electrolito sólido. Para ello, se realizó la preparación de muestras con diferentes
porcentajes de exceso mediante síntesis por vía cerámica, usando Li2CO3 como precursor de litio.
Por otro lado, se estudió la influencia de la temperatura de sinterización en los materiales, así
como el efecto del tratamiento térmico de quenching en las diferentes propiedades del material.
Los materiales preparados fueron caracterizados por: Difracción de Rayos-X (DRX), Microscopía
electrónica de barrido (SEM), Espectroscopia infrarroja, análisis de densidad mediante
Arquímedes y Espectroscopia de Impedancia Compleja (EIC).
Se obtuvieron resultados para cada una de las muestras, teniendo así datos de conductividad
para cada una de las composiciones, pudiendo observar que ésta aumenta con el exceso de Li2CO3.
La conductividad máxima obtenida a temperatura ambiente finalmente en este trabajo fue de
2,5158 x 10–5 S/cm para la muestra correspondiente a un exceso 4 % sinterizada a 925 ºC y tras la
realización del tratamiento térmico quenching.
Due to the growing development of electronic devices and other products which request energy from an electric storage cell, the research, growth and improvement of the properties of these cells, is one of the main aims nowadays for optimising these devices. This thesis summarises the study of the effect of Li2CO3 excess added to an ionic conductor with a garnet crystal structure, whose composition is Li5La3Nb2O12, for its application as a solid electrolyte in ion-lithium batteries. For this purpose, samples were prepared with different Li2CO3 excess, used as a lithium forerunner, through ceramic synthesis. In addition, the influence of the sintering temperature in the materials was studied, as well as the effect of the heat treatment called quenching to the material´s properties. The prepared materials were characterised by: X-ray diffraction (PXRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), density analysis by Arquímides and impedance spectroscopy (IS). Results were obtained for each specimen, giving information about the conductivity of each one of them. It can be concluded that the ionic conductivity increases with the amount of Li2CO3 added. The best total ionic conductivity measured at room temperature was 2,5153 x 10-5 S/cm after heat treatment.
Due to the growing development of electronic devices and other products which request energy from an electric storage cell, the research, growth and improvement of the properties of these cells, is one of the main aims nowadays for optimising these devices. This thesis summarises the study of the effect of Li2CO3 excess added to an ionic conductor with a garnet crystal structure, whose composition is Li5La3Nb2O12, for its application as a solid electrolyte in ion-lithium batteries. For this purpose, samples were prepared with different Li2CO3 excess, used as a lithium forerunner, through ceramic synthesis. In addition, the influence of the sintering temperature in the materials was studied, as well as the effect of the heat treatment called quenching to the material´s properties. The prepared materials were characterised by: X-ray diffraction (PXRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), density analysis by Arquímides and impedance spectroscopy (IS). Results were obtained for each specimen, giving information about the conductivity of each one of them. It can be concluded that the ionic conductivity increases with the amount of Li2CO3 added. The best total ionic conductivity measured at room temperature was 2,5153 x 10-5 S/cm after heat treatment.
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Keywords
Conductividad, Conductores iónicos, Granate, Propiedades eléctricas, Conductivity, Ionic conductors, Garnet material, Electrical properties