Understanding on the structural and electrochemical performance of orthorhombic sodium manganese oxides
- Authors
- Choi, Ji Ung; Yoon, Chong Seung; Zhang, Qian; Kaghazchi, Payam; Jung, Young Hwa; Lee, Kug-Seung; Ahn, Do-Cheon; Sun, Yang-Kook; Myung, Seung-Taek
- Issue Date
- Jan-2019
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.1, pp.202 - 211
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 7
- Number
- 1
- Start Page
- 202
- End Page
- 211
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/4629
- DOI
- 10.1039/c8ta08796b
- ISSN
- 2050-7488
- Abstract
- We investigate the orthorhombic Na0.67[NixMn1−x]O2 (x = 0 and 0.05) cathode materials that provide high capacity for prolonged cycles. X-ray absorption studies revealed that the redox activity of the Mn3+/4+ and Ni2+/3+ pairs is effective in suppressing the Jahn–Teller effect of Mn3+ ions because of the network with Ni2+ ions. This effect influenced the smooth voltage variations in the voltage profile for Na0.67[Ni0.05Mn0.95]O2, whereas several complicated voltage plateaus associated with the first-order phase transition were noticed in Na0.67MnO2. Operando synchrotron X-ray diffraction and transmission microscopy studies confirmed the simplicity of the phase transition for Na0.67[Ni0.05Mn0.95]O2 due to suppression of the Jahn–Teller effect of Mn3+ in the oxide lattice. These findings, along with the capacity retention during prolonged cycling and the acceptable thermal properties, make high-capacity sodium-ion batteries feasible, inexpensive, and safe for energy storage application.
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