TY  - JOUR
AU  - Uhlemann, Martin
AU  - Madian, Mahmoud
AU  - Leones, Rita
AU  - Oswald, Steffen
AU  - Maletti, Sebastian
AU  - Eychmüller, Alexander
AU  - Mikhailova, Daria
TI  - In-Depth Study of Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> Performing beyond Conventional Operating Conditions
JO  - ACS applied materials & interfaces
VL  - 12
IS  - 33
SN  - 1944-8252
CY  - Washington, DC
PB  - Soc.
M1  - PUBDB-2021-00132
SP  - 37227 - 37238
PY  - 2020
AB  - Lithium-ion batteries (LIBs) are nowadays widely used in many energy storage devices, which have certain requirements on size, weight, and performance. State-of-the-art LIBs operate very reliably and with good performance under restricted and controlled conditions but lack in efficiency and safety when these conditions are exceeded. In this work, the influence of outranging conditions in terms of charging rate and operating temperature on electrochemical characteristics was studied on the example of lithium titanate (Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>, LTO) electrodes. Structural processes in the electrode, cycled with ultrafast charge and discharge, were evaluated by operando synchrotron powder diffraction and ex situ X-ray absorption spectroscopy. On the basis of the Rietveld refinement, it was shown that the electrochemical storage mechanism is based on the Li-intercalation process at least up to current rates of 5C, meaning full battery charge within 12 min. For applications at temperatures between −30 and 60 °C, four carbonate-based electrolyte systems with different additives were tested for cycling performance in half-cells with LTO and metallic lithium as electrodes. It was shown that the addition of 30 wt 
LB  - PUB:(DE-HGF)16
C6  - pmid:32687305
UR  - <Go to ISI:>//WOS:000563074900041
DO  - DOI:10.1021/acsami.0c10576
UR  - https://bib-pubdb1.desy.de/record/453741
ER  -