DataVXAdvanced Energy MaterialsPaper
journal article·2022-03

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

Geon‐Hee Yoon, Sojung Koo, Sung‐Joon Park, Jaewoon Lee, Chanwoo Koo, Seok Hyun Song, Tae‐Yeol Jeon, Hyungsub Kim, Jong‐Seong Bae, Won‐Jin Moon, Sung‐Pyo Cho, Duho Kim, Seung‐Ho Yu

Advanced Energy Materials· Volume 12· Issue 11
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Source abstract

Abstract

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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Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemical and Biological Engineering Korea University 145 Anam‐ro, Seongbuk‐gu Seoul 02841 Republic of Korea

Department of Mechanical Engineering (Integrated Engineering Program) Kyung Hee University 1732, Deogyeong‐daero, Giheung‐gu, Yongin‐si Gyeonggi‐do 17104 Republic of Korea

Neutron Science Center Korea Atomic Energy Research Institute (KAERI) 111 Daedeok‐daero 989 Beon‐gil, Yuseong‐gu Daejeon 34057 Republic of Korea

Beamline Department Pohang Accelerator Laboratory (PAL), Pohang 80 Jigok‐ro 127 Beon‐gil, Nam‐gu, Pohang‐si Gyeongsangbuk‐do 37673 Republic of Korea

Busan Center Korea Basic Science Institute 30 Gwahaksandan 1‐ro, 60 Beon‐gil, Gangseo‐gu Busan 46742 Republic of Korea

Gwangju Center Korea Basic Science Institute 77 Yongbong‐ro, Buk‐gu Gwangju 61186 Republic of Korea

National Center for Inter‐University Research Facilities Seoul National University Seoul 08826 Republic of Korea

Funding

National Research Foundation of Korea

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