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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20500 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ACS Applied Materials &amp; Interfaces

ISSN

1944-8244

e-ISSN

1944-8252

Svazek periodika

17

Číslo periodika v rámci svazku

41

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

57392-57402

Kód UT WoS článku

001586603400001

EID výsledku v databázi Scopus

2-s2.0-105018685873