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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >High energy density hybrid Mg2+/Li+ battery with superior ultra-low temperature performance
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High energy density hybrid Mg2+/Li+ battery with superior ultra-low temperature performance

机译：高能量密度混合Mg2 + / Li +电池，具有出色的超低温性能

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摘要

The development of high energy density rechargeable Mg-based batteries operating in a wide electrochemical window and ultra-low temperature remains a great challenge owing to parasitic side reactions between electrolytes and battery components when examined at high operating potentials (above 2.0 V vs. Mg2+/Mg). Herein we propose a flexible pyrolytic graphitic film (GF) as a reliable current collector of high-voltage cathodes for a hybrid Mg2+/Li+ battery within a pouch cell configuration. The utilization of such a highly electrochemical stable GF unlocks the critical bottleneck of incompatibility among all battery parts, especially parasitic corrosive reactions between electrolytes and currently available current collectors, which takes a big step forward towards the practical applications of Mg-based batteries. With an operating potential of 2.4 V, the hybrid Mg2+/Li+ battery designed by us can deliver a maximum energy density of 382.2 W h kg(-1), which significantly surpasses that of the conventional Mg battery (about 60 W h kg(-1)), and the Al battery (about 40 W h kg(-1)) as well as the state-of-the-art hybrid Na/Mg and Li/Mg batteries. The electrochemical property of the hybrid Mg2+/Li+ battery is also characterized by higher rate capability (68.8 mA h g(-1) at 3.0C), higher coulombic efficiency of 99.5%, and better cyclic stability (98% capacity retention after 200 cycles at 1.0C). In addition, the designed hybrid battery delivers excellent electrochemical performance at an ultra-low temperature of -40 degrees C, at which it retains 77% capacity compared to that of room temperature. Our strategy opens up a new possibility for widespread applications of graphitic current collectors towards high energy rechargeable Mg-based hybrid batteries, especially applied in polar regions, aerospace, and deep offshore waters.
机译：由于在高工作电势下（2.0 V vs. Mg2 + /，高于2.0 V时）检查，电解质和电池组件之间的寄生副反应，在宽的电化学窗口和超低温下运行的高能量密度可充电镁基电池的开发仍然是一个巨大的挑战。镁）。本文中，我们提出了一种柔性热解石墨膜（GF），作为袋式电池配置中混合Mg2 + / Li +电池的高压阴极的可靠集电器。如此高度电化学稳定的GF的使用解决了所有电池部件之间不兼容的关键瓶颈，尤其是电解质与目前可用的集电器之间的寄生腐蚀反应，这为镁基电池的实际应用迈出了一大步。我们设计的Mg2 + / Li +混合动力电池在2.4 V的工作电压下可提供382.2 W h kg（-1）的最大能量密度，大大超过了传统Mg电池的能量密度（约60 W h kg（- 1）），铝电池（约40 W h kg（-1））以及最新的混合型Na / Mg和Li / Mg电池。混合Mg2 + / Li +电池的电化学特性还具有更高的倍率能力（3.0C时为68.8 mA hg（-1）），更高的库伦效率（99.5％）和更好的循环稳定性（在200次循环下保持98％的容量） 1.0C）。此外，设计的混合动力电池在-40摄氏度的超低温下具有出色的电化学性能，与室温相比，在该温度下可保持77％的容量。我们的策略为石墨集电器在高能可充电镁基混合电池中的广泛应用开辟了新的可能性，特别是在极地地区，航空航天和深海中。

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