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Título : Sodium insertion in high pressure β-V2O5 : a new high capacity cathode material for sodium ion batteries
Autor : Córdoba, Rafael
Kuhn, Alois
Pérez Flores, Juan Carlos.
Gallardo Amores, José Manuel.
García Alvarado, Flaviano
Materias: Vanadium oxideSodium insertionBattery materialCathodeEx situ XRD
Fecha de publicación : 1-mar-2019
Citación : Journal of Power Sources, e-ISSN 0378-7753, vol. 422, 2019, pp 42-48
Resumen : β-V2O5, obtained by a high-temperature high-pressure method, exhibits a layered structure that favours the insertion of Na+. In this work, we report the electrochemical insertion of sodium in high pressure β-V2O5 and its performance as cathode material for sodium-ion batteries. The material shows a first discharge capacity of 132 mAh g-1 in the 3.6-2.0 V range at a C/20 current density and a maximum capacity of 147 mAh g-1 under equilibrium conditions, corresponding to the insertion of 1 Na+ ion per formula unit. The -V2O5//Na cell delivers a specific energy as high as 370-410 Wh kg−1. The amount of inserted sodium points to the reduction of 50% of the available V5+ ions. After 20 cycles, the discharge capacity retains 86% of the initial capacity. Concerning the reaction mechanism of high pressure β-V2O5 upon sodium insertion/de-insertion, several phase transitions are inferred from the voltage-composition profile. Ex situ XRD reveals the appearance of several NaxV2O5 phases in the 0  x  1 compositional range, which are closely related with the non-sodiated high pressure β-V2O5 structure. An irreversible structural transformation occurs during the very first inserted sodium, at the beginning of the first discharge, and the original high pressure β-V2O5 structure is not recovered upon full Na+ extraction. Electrochemical performances are outstanding though.
URI : http://hdl.handle.net/10637/12159
ISSN : 0378-7753
Aparece en las colecciones: Facultad de Farmacia

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