TY  - JOUR
AU  - Cao, Xia
AU  - He, Xin
AU  - Wang, Jun
AU  - Liu, Haidong
AU  - Röser, Stephan
AU  - Rezaei Rad, Babak
AU  - Evertz, Marco
AU  - Streipert, Benjamin
AU  - Li, Jie
AU  - Wagner, Ralf
AU  - Winter, Martin
AU  - Cekic-Laskovic, Isidora
TI  - 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
JO  - ACS applied materials & interfaces
VL  - 8
IS  - 39
SN  - 1944-8252
CY  - Washington, DC
PB  - Soc.
M1  - FZJ-2017-02814
SP  - 25971 - 25978
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000384951800038
DO  - DOI:10.1021/acsami.6b07687
UR  - https://juser.fz-juelich.de/record/828997
ER  -