Covalently binding ultrafine MoS2 particles to N, S co-doped carbon renders excellent Na storage performances. (30th October 2021)

• Record Type: Journal Article
• Authors: Wang, Tian; Xi, Qiao; Wang, Ke; Zeng, Zhichao; Du, Zhuzhu; Xu, Zhanwei; Xie, Linghai; Ai, Wei; Huang, Wei
• Is Part Of: Carbon. Volume 184(2021)
• Page Start: 177
• Page End: 185
• Publication Date: 2021-10-30
• Subjects: Ultrafine MoS2 nanoparticles -- N, S co-Doped carbon -- Sodium-ion batteries -- Anode -- Density function theory calculations; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2021.08.019
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: MoS2 has attracted much interest for the potential application in sodium-ion batteries (SIBs) anodes because of the high theoretical capacity and electrochemical activity with Na. However, poor electrochemical performance caused by severe volume variations during the charge/discharge processes limits its practical application. Herein, we present an elaborately designed architecture comprising ultrafine MoS2 nanoparticles covalently bonded to N, S co-doped carbon (MoS2 /NSC) via an in situ solid-state growth process, which displays high-capacity Na storage, fast sodiation/desodiation kinetics, and substantially mitigated volume fluctuations. As a consequence, MoS2 /NSC delivers outstanding Na storage performances including a high reversible capacity of 340 mA h g −1 at 100 mA g −1 and a rate capacity of 208 mA h g −1 at 2000 mA g −1 . Further assembling with a Na3 V2 (PO4 )3 /C cathode, the full-cell delivers a specific capacity of 238 mA h g −1 after 80 cycles at 50 mA g −1, demonstrating the great potential of our MoS2 /NSC electrode. Density function theory calculations manifest that NSC not only presents strong binding to MoS2 but also significantly decreases the Na ion diffusion energy barrier, thus leading to robust structure stability and fast electrode kinetics. This study may open a new and efficient avenue for developing advanced MoS2 anodes for SIBs. Graphical abstract: A composite anode comprising ultrafine MoS2 nanoparticles covalently bonded to N, S co-doped carbon has been constructed via an in situ solid-state growth process, which displays a low ion diffusion energy barrier and fast kinetics for Na storage. Image 1