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Magnesium Ethylenediamine Borohydride as Solid-State Electrolyte for Magnesium Batteries

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ABSTRACT

Solid-state magnesium ion conductors with exceptionally high ionic conductivity at low temperatures, 5 × 10−8 Scm−1 at 30 °C and 6 × 10−5 Scm−1 at 70 °C, are prepared by mechanochemical reaction of magnesium borohydride and ethylenediamine. The coordination complexes are crystalline, support cycling in a potential window of 1.2 V, and allow magnesium plating/stripping. While the electrochemical stability, limited by the ethylenediamine ligand, must be improved to reach competitive energy densities, our results demonstrate that partially chelated Mg2+ complexes represent a promising platform for the development of an all-solid-state magnesium battery.

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(a) Temperature dependence of ionic conductivity of Mg(BH4)2, Mg(en)3(BH4)2 and Mg(en)1(BH4)2, together with literature data for MgZr4(PO4)613, Mg1.4Zr4P6O24.4 + 0.4Zr2O(PO4)21415 and Mg(BH4)(NH2)17. (b,c) Nyquist plots of Mo/Mg(en)1(BH4)2/Mo at 30 and 70 °C, respectively.
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f2: (a) Temperature dependence of ionic conductivity of Mg(BH4)2, Mg(en)3(BH4)2 and Mg(en)1(BH4)2, together with literature data for MgZr4(PO4)613, Mg1.4Zr4P6O24.4 + 0.4Zr2O(PO4)21415 and Mg(BH4)(NH2)17. (b,c) Nyquist plots of Mo/Mg(en)1(BH4)2/Mo at 30 and 70 °C, respectively.

Mentions: The temperature dependence of the ionic conductivity of Mg(BH4)2, Mg(en)3(BH4)2 and Mg(en)1(BH4)2 was determined by electrochemical impedance spectroscopy (EIS) in the temperature range between room temperature and 70 °C in symmetric cells with Mg-blocking molybdenum electrodes, Mo/Mg(en)x(BH4)2/Mo (Fig. 2a). Typical Nyquist plots are presented in Fig. 2b and c for Mg(en)1(BH4)2 at 30 and 70 °C, respectively and show standard ionic conduction behavior with a single semicircle. The ionic conductivity was extracted from the higher frequency intercept of the extrapolated semicircle with the horizontal axis, and taking into account the geometry of the sample. Ionic conductivities measured as a function of temperature are summarized in Fig. 2a for Mg(BH4)2, Mg(en)3(BH4)2 and Mg(en)1(BH4)2, together with selected literature data for Mg(BH4)(NH2), MgZr4(PO4)6 and Mg1.4Zr4P6O24.4 + 0.4Zr2O(PO4)2.


Magnesium Ethylenediamine Borohydride as Solid-State Electrolyte for Magnesium Batteries
(a) Temperature dependence of ionic conductivity of Mg(BH4)2, Mg(en)3(BH4)2 and Mg(en)1(BH4)2, together with literature data for MgZr4(PO4)613, Mg1.4Zr4P6O24.4 + 0.4Zr2O(PO4)21415 and Mg(BH4)(NH2)17. (b,c) Nyquist plots of Mo/Mg(en)1(BH4)2/Mo at 30 and 70 °C, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5384009&req=5

f2: (a) Temperature dependence of ionic conductivity of Mg(BH4)2, Mg(en)3(BH4)2 and Mg(en)1(BH4)2, together with literature data for MgZr4(PO4)613, Mg1.4Zr4P6O24.4 + 0.4Zr2O(PO4)21415 and Mg(BH4)(NH2)17. (b,c) Nyquist plots of Mo/Mg(en)1(BH4)2/Mo at 30 and 70 °C, respectively.
Mentions: The temperature dependence of the ionic conductivity of Mg(BH4)2, Mg(en)3(BH4)2 and Mg(en)1(BH4)2 was determined by electrochemical impedance spectroscopy (EIS) in the temperature range between room temperature and 70 °C in symmetric cells with Mg-blocking molybdenum electrodes, Mo/Mg(en)x(BH4)2/Mo (Fig. 2a). Typical Nyquist plots are presented in Fig. 2b and c for Mg(en)1(BH4)2 at 30 and 70 °C, respectively and show standard ionic conduction behavior with a single semicircle. The ionic conductivity was extracted from the higher frequency intercept of the extrapolated semicircle with the horizontal axis, and taking into account the geometry of the sample. Ionic conductivities measured as a function of temperature are summarized in Fig. 2a for Mg(BH4)2, Mg(en)3(BH4)2 and Mg(en)1(BH4)2, together with selected literature data for Mg(BH4)(NH2), MgZr4(PO4)6 and Mg1.4Zr4P6O24.4 + 0.4Zr2O(PO4)2.

View Article: PubMed Central - PubMed

ABSTRACT

Solid-state magnesium ion conductors with exceptionally high ionic conductivity at low temperatures, 5 × 10−8 Scm−1 at 30 °C and 6 × 10−5 Scm−1 at 70 °C, are prepared by mechanochemical reaction of magnesium borohydride and ethylenediamine. The coordination complexes are crystalline, support cycling in a potential window of 1.2 V, and allow magnesium plating/stripping. While the electrochemical stability, limited by the ethylenediamine ligand, must be improved to reach competitive energy densities, our results demonstrate that partially chelated Mg2+ complexes represent a promising platform for the development of an all-solid-state magnesium battery.

No MeSH data available.


Related in: MedlinePlus