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Elucidation of the sodiation/desodiation mechanism in Ca_(0.5)Ti_(2)(PO_(4))_(3)/C as promising electrode for sodium batteries: New insights into the phase transitions

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Journal of Energy Chemistry 2022年第7期31卷 36-44,I0002页

作者： Abdelhaq Nassiri Noha Sabi Angelina Sarapulova Yingjin Wei Bouchaib Manoun Sylvio Indris alexandr missyul Helmut Ehrenberg Ismael Saadoune IMED-Lab Faculty of Science and Technology-Cadi Ayyad University(UCA)Av.A.El KhattabiP.B.549MarrakeshMorocco Institute for Applied Materials(IAM) Karlsruhe Institute of Technology(KIT)P.O.Box 364076021 KarlsruheGermany Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) Jilin Engineering Laboratory of New Energy Materials and TechnologyCollege of PhysicsJilin UniversityChangchun 130012JilinChina MSN Mohamed VI Polytechnic UniversityLot 660Hay Moulay RachidBen Guerir 43150Morocco CELLS-ALBA Synchrotron E-08290 Cerdanyola del VallesBarcelonaSpain Technology Development Cell(Techcell) Technology Transfer Office(TTO)Mohamed VI Polytechnic UniversityLot 660Hay Moulay RachidBen Guerir 43150Morocco

The structure evolution and electrochemical performance of Na SICON-type Ca_(0.5)Ti_(2)(PO_(4))_(3) for sodium batteries are *** phosphate was synthesized by a solid-state method,and the obtained particles were coated with carbon using *** compound crystallizes in the rhombohedral system with space group *** presence of carbon in the Ca_(0.5)Ti_(2)(PO_(4))_(3)/C composite was confirmed by Raman and Thermogravimetric *** electrochemical performance of Ca_(0.5)Ti_(2)(PO_(4))_(3)/C was investigated in the potential window 1.5–3.0 V *** metal at different scan *** compound is able to initially intercalate/deintercalate 1.6/1.15 Na per formula unit,*** operando synchrotron diffraction was done in the potential window 0.02–3.0 V ***|Na+and revealed the occurrence of several reaction regions upon first *** to 4 Na+ion per formula unit can be inserted during the first *** intensive refinement of the synchrotron X-ray diffraction(SXRD)patterns of discharged Ca_(0.5)Ti_(2)(PO_(4))_(3) evidenced the existence of five regions depending on the sodium content while the crystal structures of new phases were elucidated for the first time where sodium insertion occurs in the unusual M3 and M’3 sites of the Na SICON structure.

关键词： Sodium-ion batteries Phosphates Synchrotron Mechanism Energy storage

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