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Issue 3, 2016
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Glass-amorphous alkali-ion solid electrolytes and their performance in symmetrical cells

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Abstract

Precursors of the crystalline antiperovskites A3−xHxOCl (A = Li or Na and 0 < x < 1) can be rendered glass/amorphous solid Li+ or Na+ electrolytes by the addition of water to its solvation limit with/without the addition of a small amount of an oxide or hydroxide. The solvated water is evaporated as HCl and 2(OH) = O2− + H2O. The O2− attracts a Li+ or Na+ to form dipoles; the remaining Li+ or Na+ are mobile. The Li+ or Na+ ionic conductivities of the glass/amorphous solids have activation energies ΔHm < 0.1 eV and a room-temperature conductivity comparable to that of the best organic liquid electrolytes. Measurements of the dielectric loss tangent versus frequency show two overlapping resonances at room temperature with the Ba-doped Li-glass; they are nearly overlapping at temperatures 41 °C < T < 141 °C in the Ba-doped Na-glass. Galvanostatic charging of a symmetric Cu/Na-glass/Cu cell for 1 h showed a remarkable self-charge on switching to open circuit; charging for 15 h followed by discharging at an applied −0.1 mA of the symmetric cell showed, in the discharge mode, a replating of sodium on the anode at a positive cell current of +0.07 mA for over 15 h. A model for these behaviors is proposed. A symmetric Li/Li-glass/Li cell was cycled to demonstrate plating of Li on a current collector from the Li-glass electrolyte.

Graphical abstract: Glass-amorphous alkali-ion solid electrolytes and their performance in symmetrical cells

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Publication details

The article was received on 22 Sep 2015, accepted on 14 Dec 2015 and first published on 24 Dec 2015


Article type: Paper
DOI: 10.1039/C5EE02924D
Citation: Energy Environ. Sci., 2016,9, 948-954
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    Glass-amorphous alkali-ion solid electrolytes and their performance in symmetrical cells

    M. H. Braga, A. J. Murchison, J. A. Ferreira, P. Singh and J. B. Goodenough, Energy Environ. Sci., 2016, 9, 948
    DOI: 10.1039/C5EE02924D

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