Structure and compatibility of a magnesium electrolyte with a sulphur cathode

被引:586
作者
Kim, Hee Soo [1 ]
Arthur, Timothy S. [1 ]
Allred, Gary D. [2 ]
Zajicek, Jaroslav [3 ]
Newman, John G. [4 ]
Rodnyansky, Alexander E. [4 ]
Oliver, Allen G. [3 ]
Boggess, William C. [3 ]
Muldoon, John [1 ]
机构
[1] Toyota Res Inst N Amer, Ann Arbor, MI 48105 USA
[2] Synthonix, Wake Forest, NC USA
[3] Univ Notre Dame, Notre Dame, IN 46556 USA
[4] Evans Analyt Grp, Chanhassen, MN 55317 USA
来源
NATURE COMMUNICATIONS | 2011年 / 2卷
关键词
BATTERIES; ELECTROCHEMISTRY; SURFACE;
D O I
10.1038/ncomms1435
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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)(mu-Cl)(3)center dot(6)THF](+), 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.
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页数:6
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