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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Conversion --- Cathode --- Anode --- Battery --- Lithium

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Science: general issues --- Conversion --- Cathode --- Anode --- Battery --- Lithium --- Conversion --- Cathode --- Anode --- Battery --- Lithium

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Science: general issues --- Conversion --- Cathode --- Anode --- Battery --- Lithium

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Grâce à leur haute densité d’énergie et leurs performances électrochimiques, les accumulateurs Li-ion sont les systèmes de stockage d’énergie les plus communément retrouvés dans les appareils électriques et électroniques. Cependant, la géolocalisation du lithium et sa faible abondance naturelle impliquent un prix de plus en plus élevé des précurseurs. Une des alternatives envisagées est le sodium, beaucoup plus abondant et avec des performances proches de celle du lithium. Cette recherche porte sur l’amélioration des performances d’un matériau d’anode pour les accumulateurs Na-ion : le Na2Ti3O7 (NTO). Plusieurs voies ont été explorées : la méthode de synthèse, le précurseur de sodium, la durée et température du traitement thermique ainsi que l’ajout d’une source de carbone ex situ. Le précurseur qui a permis d’obtenir la phase NTO pure est le Na2CO3. Ensuite, entre la voie solide, la lyophilisation et le spray-drying, les meilleures performances électrochimiques ont été obtenues avec le spray-drying. L’augmentation de la durée du traitement thermique de 8h à 48h a permis d’améliorer les performances électrochimique de près de 50% (de 26 mAh/g à 45 mAh/g) pour une vitesse de cyclage de 1C. Des nanotubes de carbone (NTC) ont ensuite été ajoutés afin d’augmenter la conductivité électronique du matériau. Les meilleurs résultats ont été atteints avec l’utilisation d’une suspension commerciale de NTC dans le N-méthyl-2-pyrrolidone (NMP) ajoutée directement lors la préparation des suspensions d’électrodes. L’ajout de 20 wt% de NTC a donné des électrodes présentant des capacités de l’ordre de 110 mAh/g à une vitesse de 1C. Thanks to their high energy density and electrochemical performances, Li-ion batteries are the most common storage system used in electronic devices. However, the geolocation of lithium and its low natural abundance on earth imply an increase of the price of the precursors. A promising alternative is sodium, which is much more abundant and which performances are close to those of Li. This research focuses on improving the performances of Na2Ti3O7 (NTO), an anode material for Na-ion batteries. Several paths have been explored for this purpose: the synthesis method, the sodium precursor, the duration and temperature of the heat treatment and the addition of an ex situ carbon source. Among the synthesis method, the solid route, lyophilization and spray-drying were tested. The best electrochemical performances were obtained with spray-drying. The sodium carbonate was the only precursor which enabled the formation of pure NTO phase. Increasing the duration of the heat treatment from 8h to 48h enhanced the electrochemical performances by almost 50% (i.e. from 26 mAh/g to 45 mAh/g) at a cycling rate of 1C. Carbon nanotubes (CNTs) were added to improve the electronic conductivity of the material. Using the commercial suspension of CNTs in N-methyl-2-pyrrolidone (NMP) during the preparation of the electrode suspension led to the best results. The addition of 20 wt% of CNTs allowed to prepare an electrode which delivered capacities of about 110 mAh/g at a cycling rate of 1C.

Spray-drying, --- Na2Ti3O7 --- Sodium --- Anode --- Material --- Na-ion battery --- Matériau --- Anode --- Accumulateur Na-ion --- Physique, chimie, mathématiques & sciences de la terre > Chimie

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Ion Exchange. --- Electrodes. --- Electrochemistry. --- 541.135.5 --- 543.25 --- Electrochemistries --- Anode --- Cathode --- Anodes --- Cathodes --- Electrode --- Exchange, Ion --- Electrodes and diaphragms, e.g. --- Electroanalysis. Electrolytic methods. Electrometric methods --- Analytische toepassingen --- Ionselectieve elektroden --- Analytische toepassingen. --- Ionselectieve elektroden. --- 543.25 Electroanalysis. Electrolytic methods. Electrometric methods --- 541.135.5 Electrodes and diaphragms, e.g. --- Ion Exchange --- Electrodes --- Electrochemistry --- Electrodes and diaphragms, e.g --- Anode Materials --- Cathode Materials --- Anode Material --- Cathode Material --- Material, Anode --- Material, Cathode --- Electrochemical analysis --- Electrodes, ion selective