Nickel disulfide nanosheet as promising cathode electrocatalyst for long-life lithium-oxygen batteries
- Authors
- Ju, Bobae; Song, Hee Jo; Lee, Gwang-Hee; Sung, Myeong-Chang; Kim, 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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