Thermal Stability of NASICON-Type Na 3 V 2 (PO 4 ) 3 and Na 4 VMn(PO 4 ) 3 as Cathode Materials for Sodium-ion Batteries

Ruslan R. Samigullin (), Maxim V. Zakharkin, Oleg A. Drozhzhin () and Evgeny V. Antipov
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Ruslan R. Samigullin: Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
Maxim V. Zakharkin: Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
Oleg A. Drozhzhin: Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
Evgeny V. Antipov: Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia

Energies, 2023, vol. 16, issue 7, 1-13

Abstract: The thermal stability of NASICON-type cathode materials for sodium-ion batteries was studied using differential scanning calorimetry (DSC) and in situ high-temperature powder X-ray diffraction (HTPXRD) applied to the electrodes in a pristine or charged state. Na 3 V 2 (PO 4 ) 3 and Na 4 VMn(PO 4 ) 3 were analyzed for their peak temperatures and the exothermic effect values of their decomposition processes, as well as the phase transformations that took place upon heating. The obtained results indicate that Mn-substituted cathode material demonstrates much poorer thermal stability in the charged state, although pristine samples of both materials exhibit similar thermal behavior without any DSC peaks or temperature-induced phase transitions in the studied temperature range. The in situ HTPXRD revealed the amorphization of desodiated Na 4 VMn(PO 4 ) 3 -based electrodes occurring at 150~250 °C.

Keywords: thermal stability; DSC; HTPXRD; NASICON; substitution; cathode; sodium-ion battery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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