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

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Helena Braga (Author) FEUP; Andrew J. Murchison (Author) Other; Jorge A. Ferreira (Author) Other; Preetam Singh (Author) Other; John B. Goodenough (Author) Other

Journal

Title: Energy and Environmental Sciences

Vol. 9

Pages: 948-954

ISSN: 1754-5692

Publisher: Royal Society of Chemistry

Indexing

ISI Web of Knowledge - 43 Citations

ISI Web of Science

Scopus - 63 Citations

Scientific classification

CORDIS: Technological sciences

FOS: Engineering and technology

Other information

Authenticus ID: P-00K-9BH

DOI: 10.1039/c5ee02924d

Abstract (EN): Precursors of the crystalline antiperovskites A(3-x)H(x)OCl (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 Delta H-m < 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 degrees C < T < 141 degrees 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7