Hauptseite > Publikationsdatenbank > High Voltage LiNi $_{0.5}$ Mn $_{1.5}$ O $_{4}$ /Li $_{4}$ Ti $_{5}$ O $_{12}$ Lithium Ion Cells at Elevated Temperatures: Carbonate- versus Ionic Liquid-Based Electrolytes > print

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082 _ _ |a 540
100 1 _ |a Cao, Xia
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245 _ _ |a High Voltage LiNi $_{0.5}$ Mn $_{1.5}$ O $_{4}$ /Li $_{4}$ Ti $_{5}$ O $_{12}$ Lithium Ion Cells at Elevated Temperatures: Carbonate- versus Ionic Liquid-Based Electrolytes
260 _ _ |a Washington, DC
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520 _ _ |a Thanks to its high operating voltage, the LiNi0.5Mn1.5O4 (LNMO) spinel represents a promising next-generation cathode material candidate for Lithium ion batteries. However, LNMO-based full-cells with organic carbonate solvent electrolytes suffer from severe capacity fading issues, associated with electrolyte decomposition and concurrent degradative reactions at the electrode/electrolyte interface, especially at elevated temperatures. As promising alternatives, two selected LiTFSI/pyrrolidinium bis(trifluoromethane-sulfonyl)imide room temperature ionic liquid (RTIL) based electrolytes with inherent thermal stability were investigated in this work. Linear sweep voltammetry (LSV) profiles of the investigated LiTFSI/RTIL electrolytes display much higher oxidative stability compared to the state-of-the-art LiPF6/organic carbonate based electrolyte at elevated temperatures. Cycling performance of the LNMO/Li4Ti5O12 (LTO) full-cells with LiTFSI/RTIL electrolytes reveals remarkable improvements with respect to capacity retention and Coulombic efficiency. Scanning electron microscopy (SEM) images and X-ray diffraction (XRD) patterns indicate maintained pristine morphology and structure of LNMO particles after 50 cycles at 0.5C. The investigated LiTFSI/RTIL based electrolytes outperform the LiPF6/organic carbonate-based electrolyte in terms of cycling performance in LNMO/LTO full-cells at elevated temperatures.
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700 1 _ |a He, Xin
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700 1 _ |a Wang, Jun
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700 1 _ |a Liu, Haidong
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700 1 _ |a Röser, Stephan
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700 1 _ |a Rezaei Rad, Babak
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700 1 _ |a Evertz, Marco
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700 1 _ |a Streipert, Benjamin
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700 1 _ |a Li, Jie
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700 1 _ |a Wagner, Ralf
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700 1 _ |a Winter, Martin
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700 1 _ |a Cekic-Laskovic, Isidora
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773 _ _ |a 10.1021/acsami.6b07687
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