Raju Vadthya, Venkata Narendra Kumar Y, Vatsala Rani Jetti
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引用次数: 0
Abstract
Rechargeable magnesium batteries (RMBs) represent a promising beyond-lithium technology for energy storage due to their high energy and power densities. However, developing suitable electrolytes compatible with both electrodes and exhibiting high thermal and electrochemical stabilities remains a significant challenge for RMBs. In this study, we present the development of a novel electrolyte for RMBs based on a eutectic mixture of 1-ethyl-3-methylimidazolium chloride and 1-ethyl-3-methylimidazolium hexafluorophosphate. This electrolyte demonstrates a high ionic conductivity of ~ 6.7 mS.cm−1 at room temperature and a wide electrochemical stability window (> 4.5 V vs. Mg/Mg2+). We demonstrate that the present electrolyte enables the reversible operation of an Mg-graphite cell with a discharge capacity of ~ 120 mAh.g−1 for over 500 cycles while maintaining a Coulombic efficiency of > 95%. Furthermore, the distinctive dual-ion transport behavior of the electrolyte is substantiated through the fabrication of a symmetric graphite cell, where both anions and cations exhibit bidirectional movement during the charge and discharge processes. This cell manifests an equivalent discharge capacity to that of Mg-graphite cells. These findings underscore the potential of further optimizing RMBs utilizing this electrolyte, offering prospects for superior energy density and enhanced performance across diverse application domains.
期刊介绍:
Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.