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Quantifying Graphite Solid-Electrolyte Interphase Chemistry and its Impact on Fast Charging

Journal Article · · ACS Energy Letters

The solid-electrolyte interphase (SEI) enables the remarkable capacity retention of lithium-ion batteries, yet a comprehensive quantitative description of the SEI composition remains elusive. Using a combination of differential electrochemical mass spectrometry and mass spectrometry titration, we quantify graphite SEI components formed under electrolytes of varying salt concentrations. We find that, regardless of salt concentration, a conversion of initially deposited lithium ethylene dicarbonate to monocarbonates (likely lithium ethylene monocarbonate) and noncarbonate species occurs, and the extent of this conversion increases with electrolyte aging. Here, we additionally demonstrate that as the concentration increases (up to 2.0 M LiPF6), the SEI becomes progressively thinner with more LiF and less solid carbonates deposited. Finally, we reveal that less dead lithium formation and less solid carbonate deposition occur during prolonged fast charging for higher-concentration electrolytes. Because of the advantages imparted by a thinner SEI, the onset state of charge for lithium plating for the 2.0 M electrolyte is later than that predicted by a standard electrochemical model, underscoring the importance of explicit SEI effects in future electrochemical models.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office, Applied Battery Research and Extreme Fast Charge Program (XCEL); National Science Foundation Graduate Research Fellowship Program (NSFGRFP)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1879455
Report Number(s):
NREL/JA-5700-80769; MainId:77553; UUID:e5cabdfe-6358-4399-a42c-b7bce0cecbfb; MainAdminID:64947
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Vol. 7; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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