Stabilization of the Interface between a PEO-Based Lithium Solid Polymer Electrolyte and a 4-Volt Class Cathode, LiCoO[sub.2], by the Addition of LiPF[sub.6] as a Lithium Salt

Here, the time dependence of the interfacial resistance for Li/polyethylene oxide (PEO)-Li(CF[sub.3] SO[sub.2] )[sub.2] N (LiTFSI)-LiPF[sub.6] /LiCoO[sub.2] cells was measured to investigate the stabilization effect of LiPF[sub.6] on the interface between a solid polymer electrolyte (SPE) and a 4-vo...

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Bibliographic Details
Published in:Batteries (Basel) 2024-04, Vol.10 (4)
Main Authors: Taminato, Sou, Tsuka, Akino, Sobue, Kento, Mori, Daisuke, Takeda, Yasuo, Yamamoto, Osamu, Imanishi, Nobuyuki
Format: Article
Language:English
Subjects:
Cathodes
Composition
Design and construction
Lithium compounds
Materials
Polyelectrolytes
Online Access:Get full text
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Summary:Here, the time dependence of the interfacial resistance for Li/polyethylene oxide (PEO)-Li(CF[sub.3] SO[sub.2] )[sub.2] N (LiTFSI)-LiPF[sub.6] /LiCoO[sub.2] cells was measured to investigate the stabilization effect of LiPF[sub.6] on the interface between a solid polymer electrolyte (SPE) and a 4-volt class cathode, LiCoO[sub.2] . Impedance measurements under the applied potentials between 4.1 V and 4.4 V vs. Li/Li[sup.+] indicated that the addition of LiPF[sub.6] to LiTFSI was effective in improving the stability at high potentials such as 4.4 V vs. Li/Li[sup.+] . In contrast, the resistance of the non-doped PEO-LiTFSI/LiCoO[sub.2] interface increased with time under the lower potential of 4.1 V vs. Li/Li[sup.+] . Fairly good cycle performance was obtained for the LiPF[sub.6] -doped cell, even at a cut-off voltage of 4.5 V vs. Li/Li[sup.+] .
ISSN:2313-0105
2313-0105
DOI:10.3390/batteries10040140