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Front Cover: Revisiting the Electrochemical Lithiation Mechanism of Aluminum and the Role of Li‐rich Phases (Li 1+ x Al) on Capacity Fading (ChemSusChem 12/2019)
Author(s) -
Qin Bingsheng,
Diemant Thomas,
Zhang Huang,
Hoefling Alexander,
Behm R. Jürgen,
Tübke Jens,
Varzi Alberto,
Passerini Stefano
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201901506
Subject(s) - electrolyte , electrochemistry , electrode , phase (matter) , materials science , ionic bonding , chemical engineering , aluminium , chemistry , ion , inorganic chemistry , chemical physics , composite material , organic chemistry , engineering
The Front Cover shows the complexity and puzzling of the Li‐alloying mechanism in aluminum electrodes. The reaction mechanism is revisited by combining a number of complementary in situ and ex situ techniques, thereby gaining new insights on phase transitions, electrode kinetics, and surface chemistry. Interestingly, Li‐rich alloys (Li 1+ x Al) are not only formed upon deep lithiation but are also always present on the electrode surface. In addition, the growth of such phase in the electrode bulk is found to be strictly correlated with cell failure. Finally, the ionic liquid‐based electrolyte (0.2m LiTFSI in Py 14 TFSI) delays the occurrence of this phenomenon compared with conventional organic electrolyte (1m LiPF 6 in EC/DMC), resulting in an improved cycling stability. More information can be found in the Full Paper by Qin et al. on page 2609 in Issue 12, 2018 (DOI: 10.1002/cssc.201900597).