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Synthèse et propriétés électrochimiques de nouveaux nitrures mixtes de lithium et métaux de transition pour électrodes négatives performantes d'accumulateurs lithium-ion

Abstract : In this study, we focus on the synthesis of nitrides with 2D structure Li3-2xCoxN and 3D structure Li7MnN4 by solid state route, under controlled atmosphere. Once we master all parameters of the synthesis, we study the structural chracterization and the electrochemical properties of each compound (specific capacity, rechargeability...) In the case of 2D compounds, precises compositions were determined by Rietveld refinement A dielectric spectroscopy study demonstrate the existance of a small populations of Co+ ions among Co2+, which lead to electronic conductivity properties. By in-operando XRD study we show the lattice volume varies by only 1,5% which explains the stabilty of the specific capacity of 180mAh g-1 à 300 mAh g-1 depending on conditions. In the case of 3D compounds, Li7MnN4 showed the best performance with reversible capacities up to 300mAh g-1. A XRD in-operando study showed that the mechanism of lithium desintertion place in two biphasage and a solid solution phase. Performance optimization is possible by reducing the particle size by ball milling: capacities of 250 and 120 mAh g-1 are obtained at C and 5C rates. All these nitrides present a high reactivity with moisture but the structure was preserved in dry air
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Submitted on : Thursday, February 27, 2014 - 2:38:47 PM
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Eddie Panabiere. Synthèse et propriétés électrochimiques de nouveaux nitrures mixtes de lithium et métaux de transition pour électrodes négatives performantes d'accumulateurs lithium-ion. Autre. Université Paris-Est, 2013. Français. ⟨NNT : 2013PEST1166⟩. ⟨tel-00952770⟩

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