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Enabling Stable and Nonhysteretic Oxygen Redox Capacity in Li-Excess Na Layered Oxides

Authors
Yoon, Geon-HeeKoo, SojungPark, Sung-JoonLee, JaewoonKoo, ChanwooSong, Seok HyunJeon, Tae-YeolKim, HyungsubBae, Jong-SeongMoon, Won-JinCho, Sung-PyoKim, DuhoYu, Seung-Ho
Issue Date
3월-2022
Publisher
WILEY-V C H VERLAG GMBH
Keywords
Al substitution; first-principles calculations; layered oxides; oxygen redox; sodium-ion batteries
Citation
ADVANCED ENERGY MATERIALS, v.12, no.11
Indexed
SCIE
SCOPUS
Journal Title
ADVANCED ENERGY MATERIALS
Volume
12
Number
11
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/140271
DOI
10.1002/aenm.202103384
ISSN
1614-6832
Abstract
The demands for higher energy density of rechargeable batteries have been continuously increasing recently, and cationic redox based current cathodes have little scope to further increase energy density since they already exhibit near-theoretical specific capacities. In this regard, oxygen redox (OR) reactions have emerged as a promising breakthrough for sodium-ion battery (SIB) cathodes. Most OR-based layered oxides suffer from drastic hysteretic-oxygen capacities upon discharging after the first charging. In contrast, stable and nonhysteretic oxygen capacities are herein enabled via Al3+ incorporation into Li-excess Na layered oxide (NLMO). By combining experimental work and first-principles calculations, it is found that there is an additional stable phase during the oxygen redox for Al incorporated NLMO in comparison with bare NLMO, which is a critical factor in extending and stabilizing the discharge capacity in thermodynamics. In addition, the additional redox-inactive Al3+ leads to heterogeneous oxygen redox rather than homogeneous, which results in stabilization of the oxide framework with sensitively control of the oxygen participation upon cycling.
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