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On the Effect of Silicon Substitution in Na 3 V 2 (PO 4 ) 3 on the Electrochemical Behavior as Cathode for Sodium‐Ion Batteries
Author(s) -
Aragón María J.,
Lavela Pedro,
Ortiz Gregorio F.,
Alcántara Ricardo,
Tirado José L.
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700933
Subject(s) - electrochemistry , ion , materials science , silicon , sodium , doping , electrode , cathode , analytical chemistry (journal) , chemistry , metallurgy , optoelectronics , organic chemistry , chromatography
A new Na 3+ x V 2 (PO 4 ) 3− x (SiO 4 ) x (0≤ x ≤0.5) series is examined as the positive electrodes for sodium‐ion cells. The substitution of P by Si is evidenced by an increase in the lattice parameters and a significant modification of the particle morphology. These structural and morphological changes significantly affect the electrochemical performance. Thus, samples with low Si contents reveal better rate capabilities and cyclabilities than the Si‐free sample. A full ion cell assembled with a selected sample provides an energy density of 342 W h kg −1 after 140 cycles, demonstrating that Si doping on Na 3 V 2 (PO 4 ) 3 could be an interesting strategy for high‐performance Na‐ion cells.