Journal article
In Operando Raman Reveals Voltage-Driven SEI Chemistry in Fluorinated Gel Electrolytes
The journal of physical chemistry letters, v 17(41), pp 11963-11970
02 Oct 2026
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Abstract
A particular advantage of gel polymer electrolytes (GPEs) has been their ability to incorporate chemical moieties that create stable electrode–electrolyte interfaces that guide uniform deposition and stripping of lithium. Understanding the chemical dynamics at these interfaces remains challenging. Previously, we reported that polyvinylidene fluoride-cohexafluoropropylene (PVDF-HFP) GPEs with an ether cosolvent showed greater stability in lithium metal symmetric cells. In this work, we used a Cu|PVDF-HFP|Li cell design along with in operando Raman spectroscopy to conduct a thorough characterization of the electrolyte–electrode interface to observe the chemical dynamics at work during electrode polarization, lithium plating, and stripping. We observe that PVDF-HFP, cosolvent, and supporting salt all contribute to the initial SEI formation prior to plating. The spectral and electrochemical data using this method allow us to understand the contribution of different chemical species in the evolution of interfaces in lithium metal batteries.
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Details
- Title
- In Operando Raman Reveals Voltage-Driven SEI Chemistry in Fluorinated Gel Electrolytes
- Creators
- Rhyz Pereira - Drexel UniversityAndrew Dopilka - Lawrence Berkeley National LaboratorySubhadra Jamkar - Cornell UniversityJantakan Nedsaengtip - Cornell UniversityTaber Yim - Cornell UniversityRobert Kostecki - Lawrence Berkeley National LaboratoryVibha Kalra (Corresponding Author) - Cornell University
- Publication Details
- The journal of physical chemistry letters, v 17(41), pp 11963-11970
- Publisher
- ACS Publications
- Number of pages
- 8
- Grant note
- Workforce Development for Teachers and Scientists: DESC0014664 National Science Foundation: NSF-2427203
This material is based upon work supported by the National Science Foundation under grant no. NSF-2427203 and the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education for the DOE under contract no. DE-SC0014664.
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering; Materials Characterization Core
- Web of Science ID
- WOS:001894694000001
- Other Identifier
- 991022237359404721