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Constructing a multidimensional porous structure of K/Co co-substituted Na3V2(PO4)3/C attached on the lamellar Ti3C2Tx MXene substrate for superior sodium storage property.
- Source :
-
Dalton Transactions: An International Journal of Inorganic Chemistry . 10/28/2022, Vol. 51 Issue 40, p15425-15435. 11p. - Publication Year :
- 2022
-
Abstract
- Na3V2(PO4)3 (NVP) materials have emerged as prospective cathodes for sodium-ion batteries (SIBs). However, its weak intrinsic conductivity has limited deeper research. Herein, we adopt the strategy of simultaneous K/Co co-substitution and Ti3C2Tx MXene (MX) introduction to optimize NVP. The K/Co co-substitution brings about the synergetic effect of NVP framework stabilization. Doping Co2+ generates beneficial holes and accelerating electronic conductivity. The MX plates are stacked at random to form a porous construction, increasing the contact areas to provide more active sites for Na+ shuttling and buffering the volume change. Furthermore, the lamellar MX and the carbon layers form efficient conductive networks that increase electron migration. Notably, K0.1Na2.95V1.95Co0.05(PO4)3@MX (KC05@MX) exhibited an initial capacity of 116 mA h g−1 under 1 C with an extraordinary retention of 86.8% at the 400th cycle. It realized high performance under 20 C and 50 C, and the outputs were 93.5 and 82.4 mA h g−1 at the 1st cycle and 66.6 and 53.4 mA h g−1 at the 1000th cycle, respectively, with slight capacity loss at 0.028% and 0.035%. Furthermore, the Bi2Se3//KC05@MX asymmetric full cell expressed great electrochemical properties, indicating the superior practical application prospect of KC05@MX. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SODIUM
*SODIUM ions
*STORAGE
*CATHODES
*ELECTRONS
Subjects
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 51
- Issue :
- 40
- Database :
- Academic Search Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 159741950
- Full Text :
- https://doi.org/10.1039/d2dt02087d