Chemically Integrating MXene Nanosheets with N-Doped C-Coated Si Nanoparticles for Enhanced Li Storage Performance
- Authors
- Jo, D.Y.; Kim, J.K.; Oh, H.G.; Kang, Y.C.; Park, S.-K.
- Issue Date
- 1-7월-2021
- Publisher
- Acta Materialia Inc
- Keywords
- Carbon coating; Li-ion battery; MXene; Silicon anode; Ternary composite
- Citation
- Scripta Materialia, v.199
- Indexed
- SCIE
SCOPUS
- Journal Title
- Scripta Materialia
- Volume
- 199
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/128736
- DOI
- 10.1016/j.scriptamat.2021.113840
- ISSN
- 1359-6462
- 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. © 2021
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