%0 Journal Article
%A Cao, Xia
%A He, Xin
%A Wang, Jun
%A Liu, Haidong
%A Röser, Stephan
%A Rezaei Rad, Babak
%A Evertz, Marco
%A Streipert, Benjamin
%A Li, Jie
%A Wagner, Ralf
%A Winter, Martin
%A Cekic-Laskovic, Isidora
%T 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
%J ACS applied materials & interfaces
%V 8
%N 39
%@ 1944-8252
%C Washington, DC
%I Soc.
%M FZJ-2017-02814
%P 25971 - 25978
%D 2016
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000384951800038
%R 10.1021/acsami.6b07687
%U https://juser.fz-juelich.de/record/828997