Low Temperature Performance of a Ferroelectric Glass Electrolyte Rechargeable Cell

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019-05-15

Autores

Maria Helena Braga (Autor) FEUP; Andrew J. Murchison (Autor) Outra; Joana C. R. E. Oliveira (Autor) FEUP; John B. Goodenough (Autor) Outra

Revista

Título: ACS Applied Energy Materials

Vol. 2 Nº 7

Páginas: 4943-4953

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 4 Citações

ISI Web of Science

Scopus - 5 Citações

Outras Informações

ID Authenticus: P-00Q-PWT

DOI: 10.1021/acsaem.9b00616

Abstract (EN): An electrochemical cell that powers all-electric road vehicles will likely have an alkali-metal anode and the ability to operate down to -20 degrees C. The traditional all-solid-state batteries can only perform well at temperatures above room temperature. We have shown elsewhere that an alkali-metal negative electrode can be plated dendrite free from a ferroelectric amorphous-oxide (glass) Li+ or Na+ electrolyte having a room-temperature Li+ or Na+ conductivity sigma(i) approximate to 2.5 x 10(-2) S cm(-1) which is similar to that of a liquid electrolyte. Here, it is demonstrated that the ionic conductivity of the electrolyte is sigma(i) approximate to 10(-2) S cm(-1) at -20 degrees C after optimization, and the dielectric constant is epsilon'(r) approximate to 6 X 10(5) at -35 degrees C. Moreover, it is shown that the remanent polarization of the ferroelectric-electrolyte (polarization at zero potential) adds to the capacity of the cell. The electrochemical cycling performances between -35 and 25 degrees C of the Li+-glass electrolyte in gold and lithium symmetric cells and in full cells are presented. Furthermore, it is shown that a coin-cell with the ferroelectric Li-glass electrolyte at -35 degrees C with output current of 56 mu A cm(-2) can light a red LED at 1.5 V. Finally, it is concluded that the Li+-glass electrolyte performs very well in symmetric cells and performs reasonably well down to -20 degrees C in asymmetric cells that also rely on the performance of the cathode and on the electrolyte/cathode interface.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11