Projects per year
The major challenges faced by candidate electrode materials in lithium-ion batteries (LIBs) include their low electronic and ionic conductivities. 2D van der Waals materials with good electronic conductivity and weak interlayer interaction have been intensively studied in the electrochemical processes involving ion migrations. In particular, molybdenum ditelluride (MoTe2) has emerged as a new material for energy storage applications. Though 2H-MoTe2 with hexagonal semiconducting phase is expected to facilitate more efficient ion insertion/deinsertion than the monoclinic semi-metallic phase, its application as an anode in LIB has been elusive. Here, 2H-MoTe2, prepared by a solid-state synthesis route, has been employed as an efficient anode with remarkable Li+ storage capacity. The as-prepared 2H-MoTe2 electrodes exhibit an initial specific capacity of 432 mAh g−1 and retain a high reversible specific capacity of 291 mAh g−1 after 260 cycles at 1.0 A g−1. Further, a full-cell prototype is demonstrated by using 2H-MoTe2 anode with lithium cobalt oxide cathode, showing a high energy density of 454 Wh kg−1 (based on the MoTe2 mass) and capacity retention of 80% over 100 cycles. Synchrotron-based in situ X-ray absorption near-edge structures have revealed the unique lithium reaction pathway and storage mechanism, which is supported by density functional theory based calculations.
|Number of pages||16|
|Publication status||Published - 24 Sep 2020|
- anode materials
- lithium-storage mechanisms
- molybdenum ditellurides
- operando X-ray absorption spectroscopy
- 1 Finished
Advanced in-situ electron microscope facility for research in alloys, nanomaterials, functional materials, magnetic materials and minerals
Etheridge, J., Bond, A., Hodgson, P., Kalantar-Zadeh, K., Li, D., McCulloch, D. G., Muddle, B., Mulvaney, P., Pring, A. S. & Suzuki, K.
Australian Research Council (ARC), Deakin University, RMIT University, South Australian Museum, University of Adelaide, University of Melbourne, Victorian Centre for Advanced Materials Manufacturing (VCAMM)
1/01/11 → 15/04/14
Centre for Electron Microscopy (MCEM)
Flame Sorrell (Manager) & Peter Miller (Manager)Office of the Vice-Provost (Research and Research Infrastructure)