Nouveaux matériaux d'électrodes à haute densité d'énergie pour batteries Na-ion

Abstract : N the coming years, the production of Energy will have to go through the use of more environmentally friendly means such as renewable energies. However, their intermittent nature requires the establishment of a large-scale storage. Among the various technologies available, Na-ion batteries appear as a solution of choice thanks to unlimited sodium resources. In this context, we are interested in the synthesis and characterization of new positive electrode materials for Na-ion batteries. The transition metal oxides, and more particularly the Na-Mn-O system, have drawn our attention to the benefits of manganese in terms of non-toxicity, low cost and abundance. The phase Na4Mn2O5 (with oxygen vacancies) and Na2Mn3O7 (with manganese vacancies) show interesting specific capacities by the action of various redox phenomena. Na2Mn3O7 may be reduced, to form the phase Na4Mn3O7 and oxidized, by the action of the oxygen redox activity, giving capacities of 160 and 120 mAh/g, respectively. In order to extend the study to a transition metal that can be oxidized to a +V valence state, Na2V3O7 has also been studied and one Na+ can be reversibly extracted from it.
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Submitted on : Thursday, September 19, 2019 - 3:15:12 PM
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  • HAL Id : tel-02292229, version 1

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Evan Adamczyk. Nouveaux matériaux d'électrodes à haute densité d'énergie pour batteries Na-ion. Matériaux. Normandie Université, 2018. Français. ⟨NNT : 2018NORMC286⟩. ⟨tel-02292229⟩

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