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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2016

Autores

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

Revista

Título: Energy and Environmental Sciences

Vol. 9

Páginas: 948-954

ISSN: 1754-5692

Editora: Royal Society of Chemistry

Indexação

ISI Web of Knowledge - 43 Citações

ISI Web of Science

Scopus - 63 Citações

Classificação Científica

CORDIS: Ciências Tecnológicas

FOS: Ciências da engenharia e tecnologias

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7