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- W2013706402 abstract "Current research trends on energy storage have given new impetus to the development of sodium-ion batteries. In this context, titanium phosphates with a NASICON-related structure are known to provide a stable crystal structure for sodium mobility. With adequate redox centers, these materials are studied here as attractive cathodes vs. sodium. Powdered solids of general stoichiometry Na1+xTi2−xFex(PO4)3 (0 ≤ x ≤ 0.8) were obtained and electrochemically tested. The structural modifications induced by the substitution of Ti4+ by Fe3+ were analyzed by X-ray diffraction revealing an anisotropic change of the unit cell parameters. A continuous voltage decrease is observed between 2.6 and 2.0 V in the iron containing samples, which was ascribed to the contribution of the Fe3+/Fe2+ redox couple, as determined by 57Fe Mössbauer spectroscopy. A detailed analysis of this region revealed the occurrence of local orderings of inserted sodium ions. The introduction of low contents of iron (x = 0.2) involved a capacity value of 130.2 mA h g−1 after the first discharge and a good capacity retention after an extended cycling. It was correlated to the low internal resistance values for this composition." @default.
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- W2013706402 date "2014-04-01" @default.
- W2013706402 modified "2023-09-25" @default.
- W2013706402 title "High reversible sodium insertion into iron substituted Na1+xTi2−xFex(PO4)3" @default.
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- W2013706402 doi "https://doi.org/10.1016/j.jpowsour.2013.12.006" @default.
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