Details

Autor(en) / Beteiligte

• Lee, Youn-Ki
• Lee, Cheol-Ho
• Ri Lee, Hea
• Lee, Gwanwon
• Joh, Han-Ik
• Lee, Sungho

Titel

Understanding the influence of sulfur configuration on the electrochemical reaction pathway for lithium storage in molybdenum sulfides

Ist Teil von

• Chemical engineering journal (Lausanne, Switzerland : 1996), 2024-02, Vol.481, p.148672, Article 148672

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Through comprehensive analyses, the configuration of sulfur atoms in molybdenum sulfide plays a significant role in determining their electrochemical performance in both anode and cathode materials. We also introduce carbon composites to address inherent limitations of molybdenum sulfides. Our investigation contributes valuable insights to the development of sustainable energy technology for the future. [Display omitted] •Molybdenum sulfides with varying Mo and S ratios were prepared.•[Mo3S13]2− exhibit a unique single-step Li-ion storage mechanism.•The research highlights the critical role of S atom configuration in electrochemical behavior.•Mo3S13@rGO enhances rate capability and ensures a stable cycling lifespan.•Molybdenum sulfides have the potential to serve as both anode and cathode materials. Molybdenum sulfides are highly regarded as conversion-type electrodes with exceptional performance potential in lithium-ion batteries (LIBs). However, elucidating their lithium (Li) storage behavior has proven challenging due to the intricate sulfur (S) coordination with molybdenum atoms, which has impeded the realization of high energy densities in future Li storage systems. In this study, we investigate the electrochemical redox reaction pathways of molybdenum sulfide, specifically exploring the impact of various S configurations, including terminal, bridging, and apical S. We employ a comprehensive approach, involving extensive electrochemical measurements and depth X-ray photoelectron spectroscopy (XPS) profiling. In contrast to the multi-step conversion reactions observed in MoS2, sulfur-enriched molybdenum sulfides exhibit a unique single-step Li-ion storage mechanism. As a consequence of the pronounced effect of S configuration on the activation energy barrier during charging and discharging, the redox reaction voltage with Li ions exhibits variations. This versatility verifies that molybdenum sulfides have the potential to serve as both anode and cathode materials in lithium-ion batteries. Furthermore, we propose the incorporation of reduced graphene oxide (rGO) composites to address inherent limitations of molybdenum sulfides, including low electrical conductivity and irreversible reactions. The robust interaction between molybdenum sulfides and oxygen functional groups in rGO enhances rate capability and ensures a stable cycling lifespan. Through this systematic investigation, we suggest a comprehensive insight into the electrochemical reaction pathways governing Li storage behavior in molybdenum sulfides with distinct S configurations. This contributes to the fundamental understanding of these materials and their potential applications in advanced energy storage systems.