School of Chemistry and Chemical Engineering, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University , Shanghai 200240, P. R. China.
ACS Appl Mater Interfaces. 2017 Nov 8;9(44):38455-38466. doi: 10.1021/acsami.7b10705. Epub 2017 Oct 30.
The development of rechargeable Mg-based batteries with a high energy density is restricted by the high-voltage cathodes and the parasitic side reactions between the battery components and electrolytes operating at relatively high potentials. Here, we develop a hybrid Mg/Li cell using a monoclinic or orthorhombic Fe(MoO) cathode, a Mg anode, and a simple (PhMgCl)-AlCl + LiCl electrolyte. Hastelloy-C alloy is proposed as a current collector of high-voltage cathode for the hybrid Mg/Li battery within a Swagelok-type cell. The application of the Hastelloy-C alloy current collector breaks the crucial bottleneck of incompatibility between the currently available current collectors and electrolytes. The hybrid cell features a low voltage polarization between the discharge and charge profiles, which is in favor of practical applications. On the other hand, because all Li ions are supplied by the electrolyte in a hybrid Mg/Li battery, a high Li concentration is required to operate at high capacities for the hybrid battery. We further show the first-hand evidence about the compensation of Li ions by simply soaking the cathode in the hybrid electrolyte. The prelithiation of Li ions into monoclinic Fe(MoO) significantly enhances the cycling stability and reversibility.
可充电镁基电池的发展受到高压阴极的限制，以及在相对较高电势下工作的电池组件和电解质之间的寄生副反应的限制。在这里，我们使用四方或正交的 Fe（MoO）阴极、镁阳极和简单的（PhMgCl）-AlCl + LiCl 电解质开发了一种混合 Mg/Li 电池。哈氏合金 C 被提议作为混合 Mg/Li 电池中 Swagelok 型电池高压阴极的集流器。哈氏合金 C 集流器的应用打破了目前可用集流器和电解质之间不兼容的关键瓶颈。混合电池在放电和充电曲线之间具有低的电压极化，这有利于实际应用。另一方面，由于在混合 Mg/Li 电池中所有的锂离子都由电解质提供，因此需要高的锂离子浓度才能在高容量下运行。我们进一步通过简单地将阴极浸泡在混合电解质中来展示关于锂离子补偿的第一手证据。将锂离子预锂化到四方 Fe（MoO）中显著提高了循环稳定性和可逆性。
