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Solid polymer electrolytes regulated by ion-dipole interactions for high voltage lithium batteries
- Source :
- Giant, Vol 19, Iss , Pp 100310- (2024)
- Publication Year :
- 2024
- Publisher :
- Elsevier, 2024.
-
Abstract
- Solid polymer electrolytes (SPEs) with wide electrochemically stable window and high lithium-ion transference number (tLi+) are a requirement for high energy density lithium batteries. Here, we construct a copolymer electrolyte (PDA) with ether-ester bifunctional groups that exhibits a low highest occupied molecular orbital (HOMO) energy level by in situ polymerization. Compared to the poly(1,3-dioxolane) (PDOL) pure polyether electrolyte, the weakening of the ion-dipole interaction between lithium salt and polymer in the PDA electrolyte promotes the formation of a “weak solvation” structure. Therefore, the electrolyte achieves high oxidative stability (4.6 V vs. Li+/ Li with a standard leakage current of 10 μA), high Li+ transference number (0.60), and importantly, derives a stable LiF-rich composition on high voltage cathode surface. Which ultimately enables stable cycling of Li||LiNi0.5Co0.2Mn0.3O2 (NCM523) batteries at a range of 3.0–4.3 V. This work provides a fundamental understanding of the design of antioxidant SPEs to achieve high energy density lithium batteries.
Details
- Language :
- English
- ISSN :
- 26665425
- Volume :
- 19
- Issue :
- 100310-
- Database :
- Directory of Open Access Journals
- Journal :
- Giant
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.9422bafcbf5d49a0860e5cc0452fb909
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.giant.2024.100310