Metal Organic Framework assisted ionic conductivity in solid polymer electrolyte for application in lithium-ion battery
Abstract
Solid polymer electrolytes are safer alternatives to the current flammable liquid electrolytes used in lithium-ion batteries. We are using crystalline PEO6/LiX (X= anion) as the potential polymer electrolyte. In this structure, pairs of PEO chains wrap around each other to form cylindrical tunnels. Inside the tunnel each Li+ coordinates with six ether oxygens. The anions are located outside the tunnel. Low molecular weight PEO6 has been found to be more conductive than its amorphous counterpart. However, it is not useful for practical applications as at room temperature this structure is like viscous liquid. Although increasing molecular weight improves the structural stability of PEO6, it doesn't improve conductivity. High molecular weight PEO6 chains fold into lamellae, preventing direct pathway for lithium ion conduction. We propose that incorporating high aspect ratio nanofillers, containing lewis acidic surface sites, with PEO6 can resolve the issue. We are using metal organic framework as the nanofiller.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..MARK52009Z