Toyota Research Institute of North America, 1555 Woodridge Avenue, Ann Arbor, Michigan 48105, USA.
Nat Commun. 2011 Aug 9;2:427. doi: 10.1038/ncomms1435.
Magnesium metal is an ideal rechargeable battery anode material because of its high volumetric energy density, high negative reduction potential and natural abundance. Coupling Mg with high capacity, low-cost cathode materials such as electrophilic sulphur is only possible with a non-nucleophilic electrolyte. Here we show how the crystallization of the electrochemically active species formed from the reaction between hexamethyldisilazide magnesium chloride and aluminum trichloride enables the synthesis of a non-nucleophilic electrolyte. Furthermore, crystallization was essential in the identification of the electroactive species, Mg(2)(μ-Cl)(3)·6THF, and vital to improvements in the voltage stability and coulombic efficiency of the electrolyte. X-ray photoelectron spectroscopy analysis of the sulphur electrode confirmed that the electrochemical conversion between sulphur and magnesium sulfide can be successfully performed using this electrolyte.
镁金属因其高体积能量密度、高负还原电位和丰富的天然含量，是一种理想的可充电电池阳极材料。只有使用非亲核电解质，镁才能与高容量、低成本的阴极材料（如亲电硫）结合。在这里，我们展示了如何通过六甲基二硅氮烷氯化镁与三氯化铝之间的反应形成的电化学活性物质的结晶来合成非亲核电解质。此外，结晶对于鉴定电化学活性物质Mg(2)(μ-Cl)(3)·6THF至关重要，并且对电解质的电压稳定性和库仑效率的提高也至关重要。硫电极的 X 射线光电子能谱分析证实，使用这种电解质可以成功地进行硫和硫化镁之间的电化学转化。
