Chemically Integrating MXene Nanosheets with N-Doped C-Coated Si Nanoparticles for Enhanced Li Storage Performance. (1st July 2021)

• Record Type: Journal Article
• Authors: Jo, Du Yeol; Kim, Jin Koo; Oh, Hong Geun; Kang, Yun Chan; Park, Seung-Keun
• Is Part Of: Scripta materialia. Number 199(2021)
• Publication Date: 2021-07-01
• Subjects: Silicon anode -- Li-ion battery -- MXene -- Ternary composite -- Carbon coating; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.113840
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Herein, ternary composite composed of Si@N-doped C coupled with 2D MXene nanosheets (Si@NC/MX) is synthesized by a facile solution-based chemical method followed by thermal treatment. In the aqueous solution, polydopamine (PDA)-coated Si nanoparticles were strongly coupled with MXene nanosheets via chemical interactions. Subsequently, the PDA layers were transformed into N-doped amorphous C during the annealing process. As anodes for Li-ion batteries (LIBs), the rational architecture of composites can effectively prevent particle aggregation and restacking between MXene nanosheets during cycling. Also, the dual protection by the C layer and MXene can alleviate the large volume expansion of the Si anode and provide conductive pathways. Accordingly, the Si@NC/MX composites exhibited a high reversible capacity of 953 mA h g −1 after 300 cycles at 1 A g −1 . In addition, the electrode exerted a high reversible capacity of 849 mA h g −1 even at a high current density of 10 A g −1 . Graphical abstract: Image, graphical abstract