2024 - Sustainable Industrial Processing Summit
SIPS 2024 Volume 14. Intl. Symp on Advanced Materials, Manufacturing, Magnesium and Aluminum
| Editors: | F. Kongoli, F. Marquis, N. Chikhradze, T. Prikhna, E. Suhir, Y. Yang |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2024 |
| Pages: | 258 pages |
| ISBN: | 978-1-998384-30-3 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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POLYMER- CELLULOSE COMPOSITE ELECTROLYTE FOR IMPROVED ION CONDUCTIVITY IN LITHIUM ION BATTERIES
Pengfei Zhan1; Janna Maranas2;1NORTHWESTERN UNIVERSITY, Evanston, United States; 2PENN STATE UNIVERSITY, University Park, United States;
Type of Paper: Regular
Id Paper: 314
Topic: 43
Abstract:
The crystalline PEO6LiX complex features a tunnel-like polymer/salt structure that facilitates rapid lithium ion movement. However, its practical application is restricted because high ionic conductivity is only achievable with low molecular weight PEO; as the molecular weight increases, the alignment of tunnels is disrupted, resulting in reduced conductivity. High aspect ratio nanofillers derived from cellulose nanowhiskers are proposed to enhance tunnel structure formation. Compared to unfilled electrolytes, the ion conductivity at room temperature increases by up to 1100% when filled with cellulose nanowhiskers. Wide angle X-ray scattering (WAXS) reveals that adding cellulose nanowhiskers transforms the structure from an amorphous to a crystalline phase due to the enhanced crystallization driven by the interaction between the cellulose surface and polymer chains. Temperature-dependent conductivity measurements indicate that the activation energy for Li+ hopping is lower in samples filled with acidic cellulose nanowhiskers. Quasi-elastic neutron scattering (QENS) shows that the acidic surface stabilizes the rotation of PEO6 channels, which likely accounts for the reduced activation energy and increased conductivity.