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Electrochemical Lithium Storage Performance of Molten Salt Derived V2SnC MAX Phase
- Source :
- Nano-Micro Letters, Vol 13, Iss 1, Pp 1-10 (2021)
- Publication Year :
- 2021
- Publisher :
- SpringerOpen, 2021.
-
Abstract
- Abstract MAX phases are gaining attention as precursors of two-dimensional MXenes that are intensively pursued in applications for electrochemical energy storage. Here, we report the preparation of V2SnC MAX phase by the molten salt method. V2SnC is investigated as a lithium storage anode, showing a high gravimetric capacity of 490 mAh g−1 and volumetric capacity of 570 mAh cm−3 as well as superior rate performance of 95 mAh g−1 (110 mAh cm−3) at 50 C, surpassing the ever-reported performance of MAX phase anodes. Supported by operando X-ray diffraction and density functional theory, a charge storage mechanism with dual redox reaction is proposed with a Sn–Li (de)alloying reaction that occurs at the edge sites of V2SnC particles where Sn atoms are exposed to the electrolyte followed by a redox reaction that occurs at V2C layers with Li. This study offers promise of using MAX phases with M-site and A-site elements that are redox active as high-rate lithium storage materials.
- Subjects :
- MAX phase
Molten salt
Lithium storage
High-rate
Energy storage
Technology
Subjects
Details
- Language :
- English
- ISSN :
- 23116706 and 21505551
- Volume :
- 13
- Issue :
- 1
- Database :
- Directory of Open Access Journals
- Journal :
- Nano-Micro Letters
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.9323b8e7d34e11ad7571fac43e9ef5
- Document Type :
- article
- Full Text :
- https://doi.org/10.1007/s40820-021-00684-6