Carbon-coated FePO4 nanoparticles as stable cathode for Na-ion batteries: A promising full cell with a Na15Pb4 anode. (20th March 2022)

• Record Type: Journal Article
• Authors: Pandit, Bidhan; Fraisse, Bernard; Stievano, Lorenzo; Monconduit, Laure; Sougrati, Moulay Tahar
• Is Part Of: Electrochimica acta. Volume 409(2022)
• Publication Date: 2022-03-20
• Subjects: Sodium-ion batteries -- Cathode materials -- FePO4 -- Gitt -- Full cells; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2022.139997
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: The cheap and non-toxic FePO4, which can be obtained from LiFePO4 recovered from spent Li-ion 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 cm 2 /s at room temperature depending on the degree of sodiation. As a proof of concept, a full cell fabricated using a carbon-coated FePO4 @C cathode and a Na15 Pb4 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 FePO4 @C cathode with a recyclable lead-based anode, makes this new technology a promising real-world alternative for future commercial Na-ion systems.