High-Voltage Aqueous Magnesium Ion Batteries,ACS Central Science

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High-Voltage Aqueous Magnesium Ion Batteries
ACS Central Science ( IF 12.7 ) Pub Date : 2017-10-04 00:00:00 , DOI: 10.1021/acscentsci.7b00361
Fei Wang _{1,

2} , Xiulin Fan ₁ , Tao Gao ₁ , Wei Sun ₁ , Zhaohui Ma ₁ , Chongyin Yang ₁ , Fudong Han ₁ , Kang Xu ₂ , Chunsheng Wang ₁

Affiliation

Nonaqueous rechargeable magnesium (Mg) batteries suffer from the complicated and moisture-sensitive electrolyte chemistry. Besides electrolytes, the practicality of a Mg battery is also confined by the absence of high-performance electrode materials due to the intrinsically slow Mg²⁺ diffusion in the solids. In this work, we demonstrated a rechargeable aqueous magnesium ion battery (AMIB) concept of high energy density, fast kinetics, and reversibility. Using a superconcentration approach we expanded the electrochemical stability window of the aqueous electrolyte to 2.0 V. More importantly, two new Mg ion host materials, Li superconcentration approach we expanded the electrochemical stability window of the aqueous electrolyte to 2.0 V. More importantly, two new Mg ion host materials, Li₃V₂(PO₄)₃ and poly pyromellitic dianhydride, were developed and employed as cathode and anode electrodes, respectively. Based on comparisons of the aqueous and nonaqueous systems, the role of water is identified to be critical in the Mg ion mobility in the intercalation host but remaining little detrimental to its non-diffusion controlled process. Compared with the previously reported Mg ion cell delivers an unprecedented high power density of 6400 W kg ion cell delivers an unprecedented high power density of 6400 W kg while retaining 92% of the initial capacity after 6000 cycles, pushing the Mg ion cell to a brand new stage.

中文翻译：

高压水性镁离子电池

非水可充电镁（Mg）电池具有复杂且对湿气敏感的电解质化学成分。除了电解质外，由于固体中固有的Mg ²⁺扩散较慢，因此缺少高性能的电极材料也限制了Mg电池的实用性。在这项工作中，我们展示了具有高能量密度，快速动力学和可逆性的可再充电水镁离子电池（AMIB）概念。使用超浓缩方法，我们将电解质水溶液的电化学稳定性窗口扩展至2.0V。更重要的是，两种新型的Mg离子主体材料Li超浓缩方法将电解质水溶液的电化学稳定性窗口扩展至2.0V。更重要的是，两种新的镁离子主体材料Li ₃V ₂（PO ₄）₃和聚均苯四甲酸二酐被开发出来并分别用作阴极和阳极电极。根据对水系统和非水系统的比较，可以确定水的作用对于插层宿主中的Mg离子迁移至关重要，但对其非扩散控制过程几乎没有不利影响。与之前报道的Mg离子电池相比，其空前的高功率密度为6400 W kg离子电池，其空前的高功率密度为6400 W kg，同时在6000次循环后仍保持92％的初始容量，从而将Mg离子电池推向了一个品牌新阶段。

更新日期：2017-10-04

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