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Hydrated Mg x V 5 O 12 Cathode with Improved Mg 2+ Storage Performance
Author(s) -
Zhu Yunpei,
Huang Gang,
Yin Jun,
Lei Yongjiu,
Emwas AbdulHamid,
Yu Xiang,
Mohammed Omar F.,
Alshareef Husam N.
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202002128
Subject(s) - cathode , intercalation (chemistry) , materials science , vanadium , vanadium oxide , battery (electricity) , oxide , ion , chemical engineering , nanotechnology , inorganic chemistry , chemistry , metallurgy , power (physics) , physics , organic chemistry , quantum mechanics , engineering
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 Mg 2+ intercalation at a high operating voltage. Here, a scalable method is showcased to synthesize a hydrated Mg x V 5 O 12 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 Mg 2+ intercalation into the expanded 2D channels of the hydrated Mg x V 5 O 12 cathode, which results from the synergistic effects of Mg 2+ pillars and structural H 2 O. The findings underscore the advantage of the rich but controllable chemistry of vanadium oxide bronzes in achieving practical multivalent cation mobility.