The unexpected discovery of the Mg(HMDS)2/MgCl2 complex as a magnesium electrolyte for rechargeable magnesium batteries

Chen Liao; Niya Sa; Baris Key; Anthony K. Burrell; Lei Cheng; Larry A. Curtiss; John T. Vaughey; Jung Je Woo; Libo Hu; Baofei Pan; Zhengcheng Zhang

doi:10.1039/c5ta00118h

The unexpected discovery of the Mg(HMDS)₂/MgCl₂ complex as a magnesium electrolyte for rechargeable magnesium batteries

Chen Liao, Niya Sa, Baris Key, Anthony K. Burrell, Lei Cheng, Larry A. Curtiss, John T. Vaughey, Jung Je Woo, Libo Hu, Baofei Pan, Zhengcheng Zhang

Research output: Contribution to journal › Article › peer-review

139 Scopus citations

Abstract

We developed a unique class of non-Grignard, aluminum-free magnesium electrolytes based on a simple mixture of magnesium compounds: magnesium hexamethyldisilazide (Mg(HMDS)₂) and magnesium chloride (MgCl₂). Through a reverse Schlenk equilibrium, a concentrated THF solution of Mg(HMDS)₂-4MgCl₂ was prepared to achieve reversible Mg deposition/dissolution, a wide electrochemical window, and a coulombic efficiency of 99%. High reversible capacities and good rate capabilities were obtained in Mg-Mo₆S₈ cells using these new electrolytes in tests with different rates. The unexpected high solubility of MgCl₂ in the solvent of THF with the help from Mg(HMDS)₂ provides a new way to develop magnesium electrolytes.

Original language	English
Pages (from-to)	6082-6087
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	3
Issue number	11
DOIs	https://doi.org/10.1039/c5ta00118h
State	Published - Mar 21 2015
Externally published	Yes

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title = "The unexpected discovery of the Mg(HMDS)2/MgCl2 complex as a magnesium electrolyte for rechargeable magnesium batteries",

abstract = "We developed a unique class of non-Grignard, aluminum-free magnesium electrolytes based on a simple mixture of magnesium compounds: magnesium hexamethyldisilazide (Mg(HMDS)2) and magnesium chloride (MgCl2). Through a reverse Schlenk equilibrium, a concentrated THF solution of Mg(HMDS)2-4MgCl2 was prepared to achieve reversible Mg deposition/dissolution, a wide electrochemical window, and a coulombic efficiency of 99%. High reversible capacities and good rate capabilities were obtained in Mg-Mo6S8 cells using these new electrolytes in tests with different rates. The unexpected high solubility of MgCl2 in the solvent of THF with the help from Mg(HMDS)2 provides a new way to develop magnesium electrolytes.",

author = "Chen Liao and Niya Sa and Baris Key and Burrell, {Anthony K.} and Lei Cheng and Curtiss, {Larry A.} and Vaughey, {John T.} and Woo, {Jung Je} and Libo Hu and Baofei Pan and Zhengcheng Zhang",

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AU - Liao, Chen

AU - Sa, Niya

AU - Key, Baris

AU - Burrell, Anthony K.

AU - Cheng, Lei

AU - Curtiss, Larry A.

AU - Vaughey, John T.

AU - Woo, Jung Je

AU - Hu, Libo

AU - Pan, Baofei

AU - Zhang, Zhengcheng

PY - 2015/3/21

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AB - We developed a unique class of non-Grignard, aluminum-free magnesium electrolytes based on a simple mixture of magnesium compounds: magnesium hexamethyldisilazide (Mg(HMDS)2) and magnesium chloride (MgCl2). Through a reverse Schlenk equilibrium, a concentrated THF solution of Mg(HMDS)2-4MgCl2 was prepared to achieve reversible Mg deposition/dissolution, a wide electrochemical window, and a coulombic efficiency of 99%. High reversible capacities and good rate capabilities were obtained in Mg-Mo6S8 cells using these new electrolytes in tests with different rates. The unexpected high solubility of MgCl2 in the solvent of THF with the help from Mg(HMDS)2 provides a new way to develop magnesium electrolytes.

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The unexpected discovery of the Mg(HMDS)₂/MgCl₂ complex as a magnesium electrolyte for rechargeable magnesium batteries

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