| Autor: |
Rosas, Julian, Virya, Alvin, Lian, Keryn |
| Zdroj: |
The Journal of Physical Chemistry - Part C; 20240101, Issue: Preprints |
| Abstrakt: |
The real-time correlation between the ionic conductivity and water structure of the LiNO3-poly(vinyl alcohol) (PVA) polymer electrolyte was examined. It was found that ionic conductivity decays proportionally with the water content within the system. Under 45% relative humidity (RH) storage conditions, the ionic conductivity of LiNO3–PVA plateaus at 18 ± 2 mS cm–1, and under 15% RH conditions, it ranges from 1 to 3 mS cm–1. Using Raman spectroscopy to track the changes in hydrogen bonding within both liquid and polymer electrolytes, the HOH band (3000–3800 cm–1) was monitored in real time and compared with the changes in ionic conductivity from the electrochemical cells. The strength of the hydrogen bonding decreased with the increase in LiNO3concentration, with little influence from PVA. The specific compositions of the polymer electrolytes were correlated to the equivalent liquid concentrations of LiNO3. An equivalency of 5–7 M LiNO3for 50 wt % water of LiNO3–PVA was established, resulting in a high ionic conductivity of 48 ± 5 mS cm–1. The degradation in ionic conductivity can be attributed to fewer hopping sites through bulk water and fewer mobile ions. This analysis provides a simple and reliable method for assessing the performance of the LiNO3–PVA system, which can be applied to enhance and predict the longevity of other aqueous-based electrolytes. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
