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The Effect of MgO‐MgF 2 Synthesis Method on the Electrolyte Binding Ability in Thermal Batteries
Author(s) -
Zieliński Michał,
Czajka Bogdan,
Pietrowski Mariusz,
Kiderys Angelika,
TomskaForalewska Iwona,
Przystajko Wiesław,
Wojciechowska Maria
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700894
Subject(s) - electrolyte , calcination , ionic conductivity , materials science , sol gel , conductivity , pellets , suspension (topology) , ionic bonding , chemical engineering , analytical chemistry (journal) , chemistry , chromatography , ion , electrode , nanotechnology , catalysis , composite material , organic chemistry , mathematics , homotopy , pure mathematics , engineering
This paper describes a comparative study of synthesis (sol‐gel and suspension methods) of MgF 2 ‐MgO material used as an immobilizing agent of the electrolyte (KCl‐LiCl‐RbCl) for high temperature cells. Samples containing 20 mol.% MgF 2 obtained by the sol‐gel method, followed by calcination at 500 and 600 o C, were characterized by large specific surface areas greater than those of samples obtained by the suspension method. It was demonstrated that pellets containing 40 wt.% immobilizing agent composed of 20 mol.% MgF 2 – 80 mol.% MgO, obtained by the sol‐gel method, and calcinated at 500 °C, were good electrolyte immobilizers. This mixture remains dimensionally stable at 400 °C and under 60 kPa pressure (no leakage of the electrolyte was observed) and reveals good ionic conductivity during tests in a model cell ‐ the voltage was not less than 1.0 V and current more than 0.75 A for approximately 400 s.