Hydrated MgxV5O12 Cathode with Improved Mg2+ Storage Performance

Yunpei Zhu, Gang Huang, Jun Yin, Yongjiu Lei, Abdul Hamid Emwas, Xiang Yu, Omar F. Mohammed, Husam N. Alshareef

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)

Abstract

Mg-ion batteries (MIBs) possess promising advantages over monovalent Li-ion battery technology. However, one of the myriad obstacles in realizing highly efficient MIBs is a limited selection of cathode materials that can enable reversible, stable Mg2+ intercalation at a high operating voltage. Here, a scalable method is showcased to synthesize a hydrated MgxV5O12 cathode, which shows a high capacity of ≈160 mAh g−1 with a high voltage of 2.1 V, a decent rate capability, and an outstanding cycling life (e.g., 81% capacity retention after 10 000 cycles). The combination of in situ and ex situ characterizations and first-principles calculations provides evidence of reversible, facile topochemical Mg2+ intercalation into the expanded 2D channels of the hydrated MgxV5O12 cathode, which results from the synergistic effects of Mg2+ pillars and structural H2O. The findings underscore the advantage of the rich but controllable chemistry of vanadium oxide bronzes in achieving practical multivalent cation mobility.

Original languageEnglish
Article number2002128
JournalAdvanced Energy Materials
Volume10
Issue number45
DOIs
Publication statusPublished - 1 Dec 2020

Keywords

  • hydrated cathodes
  • Mg-ion batteries
  • synergistic effects

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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