Electrochemically Induced Structural Transformation in a γ-MnO 2 Cathode of a High Capacity Zinc-Ion Battery System
Chonnam National University · Pohang University of Science and Technology
Abstract
In the present study, an in-depth investigation on the structural transformation in a mesoporous γ-MnO2 cathode during electrochemical reaction in a zinc-ion battery (ZIB) has been undertaken. A combination of in situ Synchrotron XANES and XRD studies reveal that the tunnel-type parent γ-MnO2 undergoes a structural transformation to spinel-type Mn(III) phase (ZnMn2O4) and two new intermediary Mn(II) phases, namely, tunnel-type γ-ZnxMnO2 and layered-type L-ZnyMnO2, and that these phases with multioxidation states coexist after complete electrochemical Zn-insertion. On successive Zn-deinsertion/extraction, a majority of these phases with multioxidation states is observed to revert back to the parent γ-MnO2…
Citation impact
- FWCI
- 23.89
- Percentile
- 100%
- References
- 72
Authors
8Topics & keywords
- Materials science
- Spinel
- Electrochemistry
- Mesoporous material
- Cathode
- XANES
- Annealing (glass)
- Battery (electricity)