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Nickel disulfide nanosheet as promising cathode electrocatalyst for long-life lithium-oxygen batteries

Authors
Ju, BobaeSong, Hee JoLee, Gwang-HeeSung, Myeong-ChangKim, Dong-Wan
Issue Date
1월-2020
Publisher
ELSEVIER
Keywords
Nickel disulfide; Lithium-oxygen battery; Electrocatalyst; Carbon-free; Long-term stability
Citation
ENERGY STORAGE MATERIALS, v.24, pp.594 - 601
Indexed
SCIE
SCOPUS
Journal Title
ENERGY STORAGE MATERIALS
Volume
24
Start Page
594
End Page
601
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/58449
DOI
10.1016/j.ensm.2019.06.017
ISSN
2405-8297
Abstract
Lithium-oxygen batteries (LOBs) are considered as next-generation energy storage systems owing to their high energy densities. In order to achieve high-performance LOBs, it is necessary to develop efficient electrocatalysts that exhibit reversible formation and decomposition of discharge products on the oxygen-electrode side. In this study, single-crystalline NiS2 nanosheets (NiS2-NSs) are fabricated as an efficient electrocatalyst in an oxygen-electrode for high-performance LOBs. Ni(OH)(2)-NSs are prepared through a hydrothermal reaction and subsequently reacted with sulfur by a solid/gas phase reaction process to form NiS2-NSs. As an electrocatalyst in an oxygen-electrode, the single-crystalline NiS2-NSs can reversibly form and decompose the discharge products during the discharging and charging processes, respectively. In particular, the NiS2-NSs more effectively decompose the discharge products compared to the Ni(OH)(2)-NSs owing to its high affinity to oxygenated species. In addition, the NiS2-NSs exhibit a long-term cyclability over 300 cycles at a current density of 1000 mA g(-1) with a cut-off capacity of 1000 mA h g(-1). Moreover, NiS2-NSs without conducting agent exhibit an electrocatalytic activity and its LOB performance can be further maximized through addition of a redox mediator.
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