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

Bobae Ju, Hee Jo Song, Gwang Hee Lee, Myeong Chang Sung, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)594-601
Number of pages8
JournalEnergy Storage Materials
Volume24
DOIs
Publication statusPublished - 2020 Jan

Bibliographical note

Funding Information:
This work is supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, South Korea ( 2019R1A2B5B02070203 ) and by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT, South Korea ( 2018M3D1A1058744 ).

Funding Information:
This work is supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, South Korea (2019R1A2B5B02070203) and by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT, South Korea (2018M3D1A1058744).

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

  • Carbon-free
  • Electrocatalyst
  • Lithium-oxygen battery
  • Long-term stability
  • Nickel disulfide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Energy Engineering and Power Technology

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