Laser-pyrolysed ZnFe2O4 anode for lithium-ion batteries: understanding of the lithium storage mechanisms

Samantha Bourrioux 1
1 LEDNA - Laboratoire Edifices Nanométriques
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : The development of portable electronics, electric vehicles and renewable energies has attracted great interest in the search for new solutions for energy storage. The autonomy of current Li-ion batteries is not yet sufficient to meet the needs of these different applications. Indeed, graphite, the most used anode material, has a relatively low specific capacity of 372 mAh.g-1 which limits the battery life. It is therefore necessary to substitute graphite with a more efficient material. The ternary oxides of the AB2O4 type (A, B: transition metals) are particularly interesting candidates because of their relatively high specific capacity (from 750 to 1000 mAh.g-1). In particular, ZnFe2O4 is a promising material with a theoretical capacity of 1000 mAh.g-1 and a low working voltage (1.5V vs Li / Li +). It is also a cheap, abundant and non-toxic material. In addition, the nanostructuring of this material would ensure good mechanical stability and improve the kinetics of lithium during charge / discharge cycles. The objective of this thesis is the synthesis of ZnFe2O4 nanoparticles by a laser pyrolysis process and the evaluation of their electrochemical performances against metallic lithium. This thesis work is divided into two parts: firstly, the influence of various synthesis parameters (nature and flow rates of the gases, precursors used, etc.) on the crystalline phases and the morphologies obtained is studied. In a second step, several of the nanopowders obtained by laser pyrolysis are tested in half-cell cycling to evaluate the electrochemical performance and understand the mechanisms governing the storage of lithium in these materials. This thesis work was carried out jointly by the Grenoble-Alpes University and the Nanyang Technological University in Singapore, and in collaboration with the AIME laboratory of the University of Montpellier
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Samantha Bourrioux. Laser-pyrolysed ZnFe2O4 anode for lithium-ion batteries: understanding of the lithium storage mechanisms. Material chemistry. Communauté Universite Grenoble Alpes, 2018. English. ⟨tel-01870943⟩

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