Rationally Designed Vanadium Pentoxide as High Capacity Insertion Material for Mg-Ion

Ayan Mukherjee, Sarah Taragin, Hagit Aviv, Ilana Perelshtein, Malachi Noked

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Owing to high energy density and economic viability, rechargeable Mg batteries are considered alternatives to lithium ion batteries. However besides the chevrel phase, none of the conventional inorganic cathode materials demonstrate reversible intercalation/deintercalation of Mg+2 ions in an anhydrous electrolyte system. The lack of high voltage and high capacity cathode frustrates the realization of Mg batteries. Previous studies indicate that vanadium pentoxide (V2O5) has the potential to reversibly insert/extract Mg ions. However, many attempts to utilize V2O5 demonstrate limited electrochemical response, due to hindered Mg ion mobility in solid. Here, monodispersed spherical V2O5 with a hierarchical architecture is rationally designed, through a facile and scalable approach. The V2O5 spheres exhibit initial discharge capacity of 225 mA h g−1 which stabilizes at ≈190 mA h g−1 at 10 mA g−1, much higher than previous reports. The V2O5 spheres exhibit specific discharge capacity of 55 mA h g−1 at moderate current rate (50 mA g−1) with negligible fading after 50 cycles (≈5%) and 100 cycle (≈13%), while it retains ≈95% columbic efficiency after 100 cycles demonstrating excellent stability during Mg+2 ion intercalation/deintercalation. Most interestingly, exact phase and morphology are completely retained even after repeated Mg+2 ion intercalation/deintercalation at different current rates, demonstrating pronounced electrochemical activity in an anhydrous magnesium electrolyte.

Original languageEnglish
Article number2003518
JournalAdvanced Functional Materials
Volume30
Issue number38
DOIs
StatePublished - 1 Sep 2020

Bibliographical note

Publisher Copyright:
© 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • Mg battery
  • electrochemistry
  • spherical morphology
  • vanadium pentoxide

Fingerprint

Dive into the research topics of 'Rationally Designed Vanadium Pentoxide as High Capacity Insertion Material for Mg-Ion'. Together they form a unique fingerprint.

Cite this