Journal article
Polysulfide Speciation and Electrolyte Interactions in Lithium-Sulfur Batteries with in Situ Infrared Spectroelectrochemistry
Journal of physical chemistry. C, v 122(32), pp 18195-18203
16 Aug 2018
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Understanding redox mechanisms as well as interactions between redox species and electrolyte is critical for rational design of electrolyte/cathode systems for Li-S batteries. Here, we demonstrate in situ FT-IR with attenuated total reflection (ATR) to monitor both polysulfide (PS) speciation (S-x(2-), 2 <= x <= 8) and triflate anion (electrolyte) coordination state while simultaneously discharging/charging a full battery coin cell. We report the concentration of various PS species as a function of voltage during cell discharge. In addition, we found that molecular-level changes occurred in the electrolyte salt anion in response to PS speciation. During discharge, PS dissolution increases total solute concentration, inducing anion interactions between low coordination state complexes- ion pairs and free ions-to form aggregate complexes. Under fast cyclic voltammetry sweep, less progressive formation of all PSs, due to diffusion limitations, resulted in a higher concentration of aggregates and PSs even upon completion of discharge. This new application of in situ FT-IR offers direct insight into dynamic interactions between electrolyte salt and polysulfides fundamental in developing Li-S systems.
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Details
- Title
- Polysulfide Speciation and Electrolyte Interactions in Lithium-Sulfur Batteries with in Situ Infrared Spectroelectrochemistry
- Creators
- Caitlin Dillard - Drexel UniversityArvinder Singh - Drexel UniversityVibha Kalra - Drexel University
- Publication Details
- Journal of physical chemistry. C, v 122(32), pp 18195-18203
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 9
- Grant note
- CMMI 1537827; CMMI 1463170 / National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000442462400001
- Scopus ID
- 2-s2.0-85052153432
- Other Identifier
- 991019167578304721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology