Enhancing high-voltage solid-state lithium-metal battery performance through a stable solid-electrolyte interphase

The development of next-generation batteries relies on addressing critical challenges such as the formation of a robust and stable solid electrolyte interphase (SEI) as well as mitigating lithium dendrite propagation. In this study, we focus on addressing these issues in the preparation of solid pol...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2024-08, Vol.12 (34), p.22775-22784
Main Authors: Orue, Ander, Arrese-Igor, Mikel, Gonzalez, Uxue, Gómez, Nuria, Cid, Rosalía, López-Aranguren, Pedro
Format: Article
Language:English
Subjects:
Catalytic oxidation
Design engineering
Electrochemical analysis
Electrochemistry
Electrolytes
Electrons
Ethylene oxide
High voltages
Interphase
Lithium
Lithium batteries
Molten salt electrolytes
Oxalic acid
Oxidation
Photoelectron spectroscopy
Photoelectrons
Polyethylene oxide
Polymers
Salts
Solid electrolytes
Solid state
Voltage
X ray photoelectron spectroscopy
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Summary:The development of next-generation batteries relies on addressing critical challenges such as the formation of a robust and stable solid electrolyte interphase (SEI) as well as mitigating lithium dendrite propagation. In this study, we focus on addressing these issues in the preparation of solid polymer electrolytes (SPEs) using poly(ethylene oxide) (PEO) and three different Li-based conductive salts. We investigate the impact of each SPE on the electrochemical performance of solid-state batteries comprising a high-voltage LiNi 0.6 Mn 0.2 Co 0.2 O 2 cathode and Li-metal anode. Among the various salts, lithium bis(oxalate)borate (LiBOB) salt stands out, exhibiting a stable voltage profile during charging up to 4.2 V vs. Li/Li+ and preventing the catalytic oxidation of PEO at high-voltage. X-ray photoelectron spectroscopy reveals that LiBOB is reduced into lithium oxalate and other semicarbonate-like species, thereby enhancing the Li metal|SPE interface from the formation of a dense and stable SEI enriched with LiBOB decomposition products. Our findings underscore the significance of the choice of Li-based salts for forming a stable SEI, which is key for an interfacial engineering design that enables the high-performance of next-generation solid-state batteries.
ISSN:2050-7488
2050-7496
DOI:10.1039/D4TA02701A