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Understanding on the structural and electrochemical performance of orthorhombic sodium manganese oxides

Title
Understanding on the structural and electrochemical performance of orthorhombic sodium manganese oxides
Author
윤종승
Keywords
AB-INITIO; INTERCALATION; CATHODE; P2-TYPE; PHASES
Issue Date
2019-11
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v. 7, no. 1, Page. 202-211
Abstract
We investigate the orthorhombic Na-0.67[NixMn1-x]O-2 (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 Na-0.67[Ni0.05Mn0.95]O-2, 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 Na-0.67[Ni0.05Mn0.95]O-2 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.
URI
https://pubs.rsc.org/en/content/articlelanding/2019/TA/C8TA08796B#!divAbstracthttps://repository.hanyang.ac.kr/handle/20.500.11754/155017
ISSN
2050-7488; 2050-7496
DOI
10.1039/c8ta08796b
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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