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 journalArticle

2 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

Keywords

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

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Energy Engineering and Power Technology

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