首页|Unravelling the ion transport and the interphase properties of a mixed olivine cathode for Na-ion battery

Unravelling the ion transport and the interphase properties of a mixed olivine cathode for Na-ion battery

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The replacement of Li by Na in an analogue battery to the commercial Li-ion one appears a sustainable strategy to overcome the several concerns triggered by the increased demand for the electrochemical energy storage.However,the apparently simple change of the alkali metal represents a challenging step which requires notable and dedicated studies.Therefore,we investigate herein the features of a NaFe0.6Mn0.4PO4(NFMP)cathode with triphylite structure achieved from the conversion of a LiFe0.6Mn0.4PO4(LFMP)olivine for application in Na-ion battery.The work initially characterizes the structure,morphology and performances in sodium cell of NFMP,achieving a maximum capacity exceed-ing 100 mAh g-1 at a temperature of 55 ℃,adequate rate capability,and suitable retention confirmed by ex-situ measurements.Subsequently,the study compares in parallel key parameters of the NFMP and LFMP such as Na+/Li+ions diffusion,interfacial characteristics,and reaction mechanism in Na/Li cells using various electrochemical techniques.The data reveal that relatively limited modifications of NFMP chemistry,structure and morphology compared to LFMP greatly impact the reaction mechanism,kinetics and electrochemical features.These changes are ascribed to the different physical and chemical features of the two compounds,the slower mobility of Na+with respect to Li+,and a more resistive elec-trode/electrolyte interphase of sodium compared with lithium.Relevantly,the study reveals analogue trends of the charge transfer resistance and the ion diffusion coefficient in NFMP and LFMP during the electrochemical process in half-cell.Hence,the NFMP achieved herein is suggested as a possible candi-date for application in a low-cost,efficient,and environmentally friendly Na-ion battery.

NaFe0.6Mn0.4PO4NFMP OlivineNa-ionIon transportInterphase

Luca Minnetti、Leonardo Sbrascini、Antunes Staffolani、Vittorio Marangon、Francesco Nobili、Jusef Hassoun

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School of Sciences and Technologies-Chemistry Division,University of Camerino,Via Madonna delle Carceri ChIP,62032 Camerino,Italy

University of Bologna,Department of Chemistry"Giacomo Ciamician",Via Francesco Selmi 2,40126 Bologna,Italy

Graphene Labs,Istituto Italiano di Tecnologia,via Morego 30,Genoa 16163,Italy

Department of Chemical,Pharmaceutical and Agricultural Sciences,University of Ferrara,Via Fossato di Mortara 17,44121 Ferrara,Italy

GISEL-Centro di Riferimento Nazionale per i Sistemi di Accumulo Elettrochimico di Energia,INSTM,Firenze 50121,Italy

National Interuniversity Consortium of Materials Science and Technology(INSTM)University of Ferrara Research Unit,University of Ferrara,Via Fossato di Mortara,17,44121 Ferrara,Italy

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Fondo di Ateneo per la Ricerca Locale(FAR)2022,University of Ferraracollaboration project"Accordo di Collaborazione Quadro 2015"between University of FerraraSapienza University of Rome(Department of Chemistry)European Union's Horizon 2020 research and innovation programme Graphene Flagship

881603

2024

10.1016/j.jechem.2024.04.028

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.96(9)