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N/S Co-modified carbon/Na3V2(PO4)3 with high rate capability for Zn-ion storage.
N/S Co-modified carbon/Na3V2(PO4)3 with high rate capability for Zn-ion storage.
- Source :
- New Journal of Chemistry; 3/28/2023, Vol. 47 Issue 12, p5715-5722, 8p
- Publication Year :
- 2023
-
Abstract
- Na<subscript>3</subscript>V<subscript>2</subscript>(PO<subscript>4</subscript>)<subscript>3</subscript> (NVP) with a NASICON structure serves as one of the most promising cathode materials for aqueous zinc-ion batteries (AZIBs) due to its stable crystal structure and fast ion mobility. Nevertheless, its electrochemical properties are still unsatisfactory because of its poor electrical conductivity. A simple hydrothermal method is used to prepare carbon-coated NVP (NVP-C) and N/S co-doped carbon-coated NVP (NVP-C-NS) composites. The results demonstrate that the NVP-C-NS composite exhibits superior capacity and rate capability. After 100 cycles at a high current density of 1000 mA g<superscript>−1</superscript>, the reversible capacity of the NVP-C-NS composite can reach 115 mA h g<superscript>−1</superscript>, while pure NVP-C is capable of achieving only 83 mA h g<superscript>−1</superscript> at the same current density, and 94.8% of the capacity of the NVP-C-NS composite and only 90% of the NVP-C material are retained. The excellent electrochemical performance of the NVP-C-NS composite is mainly due to the high carbon content (13.08 wt% vs. NVP-C with 4.8 wt%.) and high conductivity (3.72 × 10<superscript>−4</superscript> S cm<superscript>−1</superscript>vs. NVP-C with 1.20 × 10<superscript>−4</superscript> S cm<superscript>−1</superscript>). The introduction of more active sites and defects after N/S doping and the increased specific surface area can provide a larger electrochemical contact surface for electrochemical reactions. Furthermore, the practicality of the NVP-C-NS//Zn battery is evaluated by lighting up LED bulbs. This work provides a reference for the development of Na<subscript>3</subscript>V<subscript>2</subscript>(PO<subscript>4</subscript>)<subscript>3</subscript> as a cathode material for AZIBs. [ABSTRACT FROM AUTHOR]
- Subjects :
- ELECTRIC conductivity
IONIC structure
SURFACE reactions
FAST ions
IONIC mobility
Subjects
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 47
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 162569152
- Full Text :
- https://doi.org/10.1039/d2nj06264j