Open AccessVat Orange 11—Based Organic Cathode Material for High Rate Rechargeable Magnesium Battery
Author(s) -
Debashis Tripathy,
H. M. Viswanatha,
Harish Makri Nimbegondi Kotresh,
S. Sampath
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ab8827
Subject(s) - electrolyte , cathode , dissolution , inorganic chemistry , chemistry , organic radical battery , electrochemistry , battery (electricity) , ion , chemical engineering , alkali metal , electrode , materials science , organic chemistry , power (physics) , physics , quantum mechanics , engineering
Mg-ion batteries are of immense interest owing to their dendrite free chemistry, low cost and high energy density and often comparable to the existing Li-ion batteries. Organic molecules as electrodes, are well-explored in alkali metal ion batteries as they are less expensive, environment friendly and amenable to redox potential-tuning. But these molecules are rarely used for secondary Mg-ion batteries and they continue to attract attention. In the present studies, an organic dye, vat orange 11, is explored as a cathode material for non-aqueous secondary Mg-ion battery in different electrolytes. The electrolyte with salt-controlled dissolution approach turns out to be very good in terms of capacity recovery with long cycle life. It shows an excellent rate performance up to a discharge current of 4000 mA g −1 with high cycling stability (1000 cycles at 500 mA g −1 current density). Further, high capacity and high rate performance are observed using a non-nucleophilic electrolyte based on an ionic liquid. The possible mechanism of Mg 2+ uptake is studied using ex situ FTIR spectroscopy that shows a transformation between carbonyl (–C=O) and enolate (–C=O − ) functional groups during charge-discharge cycles. The present studies initiate the use of vat-based dye molecules in rechargeable Mg-ion batteries.