Investigation of NaTiOPO4 as Anode for Sodium-Ion Batteries: A Solid Electrolyte Interphase Free Material?

Investigation of NaTiOPO4 as Anode for Sodium-Ion Batteries: A Solid Electrolyte Interphase Free Material?

Tavorite NaTiOPO4 (NaTP) is here explored as a possible solid electrolyte interphase (SEI) free anode material for Na-ion batteries (NIBs). The operation voltage is found around 1.4 V vs Na+/Na with a very low polarization (around 0.02 V) and an efficiency of ∼95% after 100 cycles in half-cells. Ope...

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Veröffentlicht in:ACS applied energy materials 2019-03, Vol.2 (3), p.1923-1931
Hauptverfasser: Galceran, Montserrat, Rikarte, Jokin, Zarrabeitia, Maider, Pujol, Maria C, Aguiló, Magdalena, Casas-Cabanas, Montse
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container_end_page 1931
container_issue 3
container_start_page 1923
container_title ACS applied energy materials
container_volume 2
creator Galceran, Montserrat
Rikarte, Jokin
Zarrabeitia, Maider
Pujol, Maria C
Aguiló, Magdalena
Casas-Cabanas, Montse
description Tavorite NaTiOPO4 (NaTP) is here explored as a possible solid electrolyte interphase (SEI) free anode material for Na-ion batteries (NIBs). The operation voltage is found around 1.4 V vs Na+/Na with a very low polarization (around 0.02 V) and an efficiency of ∼95% after 100 cycles in half-cells. Operando X-ray diffraction measurements have unveiled that insertion and deinsertion of Na ions occurs via a symmetric mechanism involving biphasic and solid solution reactions. The evolution of the SEI formation at different voltage values upon electrochemical cycling has been analyzed by means of X-ray photoelectron spectroscopy (XPS), and the results show that although not inexistent, a very thin and stable SEI layer is formed that positively contributes to the excellent cycling stability of the material.
doi_str_mv 10.1021/acsaem.8b02040
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