Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 157, Issue 5, Pages A611-A616Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3356988
Keywords
adsorption; aluminium compounds; electrochemical electrodes; electrochemistry; germanium compounds; glass ceramics; lithium; lithium compounds; membranes; oxygen; reduction (chemical); secondary cells; solid electrolytes; superionic conductivity
Funding
- University of Dayton Research Institute
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The roles of lithium aluminum germanium phosphate (LAGP) glass-ceramic (GC) in cathodes of totally solid-state lithium-oxygen (Li-O(2)) electrochemical cells are delineated by conducting discharge experiments as a function of cathode chemistry. It is proposed that LAGP possesses an inherent characteristic to adsorb oxygen molecules due to its open structure. The adsorption is followed by reduction of oxygen to superoxide and peroxide molecules. Subsequently, these molecules react with lithium ions to form respective discharge products. In addition to being an important constituent of the cathode, the LAGP also serves as a solid-state electrolyte membrane due to its superionic lithium-ion conductivity. The dual functions of the LAGP GCs make it a feasible material to process an integrated membrane-cathode element of a Li-O(2) cell, although this is not demonstrated in this paper.
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