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Electrolyte additives in lithium ion EV batteries and the relationship of the SEI composition to cell resistance and lifetime
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Lain, Michael J., Rubio Lopez, Irene and Kendrick, Emma (2020) Electrolyte additives in lithium ion EV batteries and the relationship of the SEI composition to cell resistance and lifetime. Electrochem, 1 (2). pp. 200-216. doi:10.3390/electrochem1020014 ISSN 2673-3293.
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Official URL: https://dx.doi.org/10.3390/electrochem1020014
Abstract
Sulphur, boron and phosphorous containing electrolyte additives were evaluated in cells containing pristine electrodes from a commercial EV lithium ion cell, against a standard baseline electrolyte. Following formation and a full cell ageing step, cycling performance and impedance spectroscopy were used to elucidate the most effective additives. The additive tris trimethyl silyl phosphite (TTSPi) showed the most promise, with improved cell capacities and reduced impedances observed after formation. X-ray photoelectron spectroscopy (XPS) measurements on anode elemental surface profiles were correlated with the electrochemical performance. It was observed that increased lithium fluoride content on the surface of the anodes typically produced cells with lower impedance. Sulphur containing additives also showed improved cell behaviours, and the decomposition and chemical reactions of these compounds at the anode surface is discussed in detail. The main influence of TTSPi was to reduce the amount of oxygen (C=O) and sulphur in the SEI layer, to be replaced with hydrocarbons.
Item Type: | Journal Article | ||||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||
Library of Congress Subject Headings (LCSH): | Lithium ion batteries, Electrodes -- Materials, Electric vehicles -- Batteries | ||||||
Journal or Publication Title: | Electrochem | ||||||
Publisher: | MDPI | ||||||
ISSN: | 2673-3293 | ||||||
Official Date: | 5 June 2020 | ||||||
Dates: |
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Volume: | 1 | ||||||
Number: | 2 | ||||||
Page Range: | pp. 200-216 | ||||||
DOI: | 10.3390/electrochem1020014 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 4 March 2024 | ||||||
Date of first compliant Open Access: | 4 March 2024 | ||||||
RIOXX Funder/Project Grant: |
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