Carbon-coated FePO4 nanoparticles as stable cathode for Na-ion batteries: A promising full cell with a Na15Pb4 anode - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Electrochimica Acta Année : 2022

Carbon-coated FePO4 nanoparticles as stable cathode for Na-ion batteries: A promising full cell with a Na15Pb4 anode

Résumé

The cheap and non-toxic FePO4, which can be recovered from spent LFP batteries, provides a reversible capacity of 103 mAh/g in coin cells, corresponding to 76% of theoretical capacity, with very good rate capability and stability. The study of the electrochemical mechanism during sodiation carried out by in situ X-ray diffraction (XRD) reveals a pure biphasic transition during Na+ (de)insertion. The chemical diffusion coefficient (DNa) determined from galvanostatic intermittent titration technique and electrochemical impedance spectroscopy varies in the range 10−16-10−10 cm2/s at room temperature depending on the degree of sodiation. As a proof of concept, a full cell fabricated using a carbon-coated C@FePO4 cathode and a Na15Pb4 anode obtained by electrochemical sodiation of recyclable Pb, maintained 76% of the initial capacity over 100 cycles at constant C/10 rate. This outstanding electrochemical performance, based on the combination of the low-cost C@FePO4 cathode with a recyclable lead-based anode, makes this new technology a promising real-world alternative for future commercial Na-ion systems.

Domaines

Matériaux

Dates et versions

hal-03562412 , version 1 (08-02-2022)

Identifiants

Citer

Bidhan Pandit, Bernard Fraisse, Lorenzo Stievano, Laure Monconduit, Moulay Tahar Sougrati. Carbon-coated FePO4 nanoparticles as stable cathode for Na-ion batteries: A promising full cell with a Na15Pb4 anode. Electrochimica Acta, 2022, 409, pp.139997. ⟨10.1016/j.electacta.2022.139997⟩. ⟨hal-03562412⟩
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