Raju Vadthya, Venkata Narendra Kumar Y, Vatsala Rani Jetti
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引用次数: 0
摘要
可充电镁电池(RMB)具有高能量和高功率密度,是一种前景广阔的锂外储能技术。然而,开发与两种电极兼容并具有高热稳定性和电化学稳定性的合适电解质仍然是可充电镁电池面临的重大挑战。在本研究中,我们基于 1-乙基-3-甲基氯化咪唑和 1-乙基-3-甲基六氟磷酸盐的共晶混合物,开发了一种新型人民币电解质。这种电解质在室温下具有约 6.7 mS.cm-1 的高离子电导率和较宽的电化学稳定性窗口(> 4.5 V vs. Mg/Mg2+)。我们证明,目前的电解质可使镁-石墨电池在超过 500 个循环中以约 120 mAh.g-1 的放电容量可逆运行,同时库仑效率保持在 > 95%。此外,通过制造对称石墨电池,证实了电解质独特的双离子传输行为,其中阴离子和阳离子在充放电过程中均表现出双向运动。这种电池的放电能力与镁石墨电池相当。这些发现强调了利用这种电解质进一步优化人民币的潜力,为在不同应用领域实现更高的能量密度和更强的性能提供了前景。
Advances in ionic-liquid-based eutectic electrolyte for high voltage rechargeable magnesium batteries
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.