Ionic Liquid Electrolyte Suppresses Deep Sodiation in Nb4P2S21/Mo2CT x Enabling Transition from Mixed-Voltage to Pure High-Voltage Operation for Sodium-Ion Battery Cathodes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43932954" target="_blank" >RIV/60461373:22310/25:43932954 - isvavai.cz</a>
Result on the web
<a href="https://pubs.acs.org/doi/10.1021/acsami.5c10976" target="_blank" >https://pubs.acs.org/doi/10.1021/acsami.5c10976</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acsami.5c10976" target="_blank" >10.1021/acsami.5c10976</a>
Alternative languages
Result language
angličtina
Original language name
Ionic Liquid Electrolyte Suppresses Deep Sodiation in Nb4P2S21/Mo2CT x Enabling Transition from Mixed-Voltage to Pure High-Voltage Operation for Sodium-Ion Battery Cathodes
Original language description
Elemental sulfur has garnered significant attention due to its low cost and high theoretical capacity; however, its reliance on ether electrolytes leads to the formation of soluble polysulfides, thereby limiting its application. Sulfur-rich transition metal polysulfides demonstrate potential as sulfur-equivalent cathodes to replace conventional sulfur in alkali metal-sulfur batteries; however, adequate research in this area remains unrevealed. In this study, we investigate the Nb4P2S21 in carbonate, ether, and ionic liquid electrolytes for sodium-ion battery testing. The material exhibits a high discharge capacity exceeding 1000 mAh/g and a prolonged discharge plateau at low potentials in both ether and carbonate electrolytes, same with other high-capacity phosphorus sulfide anodes via conversion reactions. When switching to the NaTFSI/[Emim]TFSI ionic liquid electrolyte, 96.3% of the initial discharge capacity in the 0-3 V range is retained above 0.8 V, with the suppression of low-voltage redox activity. This shift is attributed to the cointercalation of Na+ and Emim(+) ions, preventing the materials from deep sodiation at lower voltage range. The incorporation of Mo2CTx MXene into the material further reduces electrochemical polarization and enhances cycle stability. During 100 cycles, a self-activation phenomenon occurs, resulting in a maximum capacity of 384 mAh/g, while the median voltage remains above 1.5 V, predominantly governed by a pair of reversible redox peaks. X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM) analyses of postcycled material confirm the structural and compositional stability of the material during cycling. This study advances the understanding of sulfur-rich materials in sodium-ion batteries across various electrolytes, particularly ionic liquids.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20500 - Materials engineering
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
ACS Applied Materials & Interfaces
ISSN
1944-8244
e-ISSN
1944-8252
Volume of the periodical
17
Issue of the periodical within the volume
41
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
57392-57402
UT code for WoS article
001586603400001
EID of the result in the Scopus database
2-s2.0-105018685873