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Molecular Storage of Mg Ions with Vanadium Oxide Nanoclusters
Author(s) -
Cheng Yingwen,
Shao Yuyan,
Raju Vadivukarasi,
Ji Xiulei,
Mehdi B. Layla,
Han Kee Sung,
Engelhard Mark H.,
Li Guosheng,
Browning Nigel D.,
Mueller Karl T.,
Liu Jun
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201505501
Subject(s) - materials science , nanoclusters , electrochemistry , cathode , vanadium , vanadium oxide , electrolyte , battery (electricity) , oxide , energy storage , dielectric spectroscopy , nanotechnology , ion , chemical engineering , inorganic chemistry , electrode , chemistry , metallurgy , organic chemistry , power (physics) , physics , quantum mechanics , engineering
Mg batteries have potential advantages in terms of safety, cost, and reliability over existing battery technologies, but their practical implementations are hindered by the lack of amenable high‐voltage cathode materials. The development of cathode materials is complicated by limited understandings of the unique divalent Mg 2+ ion electrochemistry and the interaction/transportation of Mg 2+ ions with host materials. Here, it is shown that highly dispersed vanadium oxide (V 2 O 5 ) nanoclusters supported on porous carbon frameworks are able to react with Mg 2+ ions reversibly in electrolytes that are compatible with Mg metal, and exhibit high capacities and good reaction kinetics. They are able to deliver initial capacities exceeding 300 mAh g −1 at 40 mA g −1 in the voltage window of 0.5 to 2.8 V. The combined electron microscope, spectroscopy, and electrochemistry characterizations suggest a surface‐controlled pseudocapacitive electrochemical reaction, and may be best described as a molecular energy storage mechanism. This work can provide a new approach of using the molecular mechanism for pseudocapacitive storage of Mg 2+ for Mg batteries cathode materials.