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

156 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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doi = "10.1039/c5ta00118h",

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T1 - The unexpected discovery of the Mg(HMDS)2/MgCl2 complex as a magnesium electrolyte for rechargeable magnesium batteries

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

Y1 - 2015/3/21

N2 - 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.

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.

UR - https://www.scopus.com/pages/publications/84924278707

U2 - 10.1039/c5ta00118h

DO - 10.1039/c5ta00118h

M3 - Article

AN - SCOPUS:84924278707

SN - 2050-7488

VL - 3

SP - 6082

EP - 6087

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 11

ER -

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

Abstract

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