Electrochemical behavior of Ge and GeX2 (X = O, S) glasses: Improved reversibility of the reaction of Li with Ge in a sulfide medium
| Autor: | Steve W. Martin, Youngsik Kim, Jaephil Cho, Haesuk Hwang, Katherine Ann Lawler |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
chemistry.chemical_classification
Materials science Sulfide General Chemical Engineering Inorganic chemistry Oxide Analytical chemistry chemistry.chemical_element Electrochemistry Anode Ion Metal chemistry.chemical_compound chemistry visual_art visual_art.visual_art_medium Ionic conductivity Lithium |
| Zdroj: | Electrochimica Acta. 53:5058-5064 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2007.12.015 |
| Popis: | Sulfide glasses have been considered as new anode materials for lithium-ion batteries because their high ionic conductivity (approximately ≥10 −4 S/cm) (more than one order of magnitude higher than oxide glasses (approximately ≤10 −6 S/cm)) was expected to accelerate Li + ion insertion into and extraction from anode materials during charge and discharge reactions. This intrinsic property can yield the reversible lithium-alloying reaction by minimizing the aggregation of lithium-alloy phases leading to the improvement of cycling behavior. To examine sulfide glasses as new anode materials, GeS 2 glass was chosen for study in this work due to its stability in air-atmospheres. The electrochemical properties of the GeS 2 glass were compared with those of the Ge metal and GeO 2 glass. The initial insertion of lithium into the GeX 2 (X = O, S) glasses leads to the formation of Li 2 X (X = O, S) phases associated with the irreversible capacity on the first cycle. The improved reversibility of the reaction of lithium with Ge was observed in the Li 2 S medium rather than Li 2 O one, which leads to the improvement of cycle performance in the GeS 2 glass anode. |
| Databáze: | OpenAIRE |
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