Ti3C2Tx nanosheet@Cu/Fe-MOF separators for high-performance lithium-sulfur batteries: an experimental and density functional theory study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F23%3A00369437" target="_blank" >RIV/68407700:21220/23:00369437 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1039/D3DT03134A" target="_blank" >https://doi.org/10.1039/D3DT03134A</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/D3DT03134A" target="_blank" >10.1039/D3DT03134A</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Ti3C2Tx nanosheet@Cu/Fe-MOF separators for high-performance lithium-sulfur batteries: an experimental and density functional theory study

Popis výsledku v původním jazyce

Lithium-sulfur (Li-S) batteries have attracted much attention due to their superior theoretical specific capacity and high theoretical energy density. However, rapid capacity fading originating from the shuttle effect, insulating the S cathode and the dendritic formation on the Li anode restrict the practical applications of Li-S batteries. Herein, we suggest novel coatings on glass fiber separators to satisfy all high-performance Li-S battery requirements. A conductive Ti3C2Tx (MXene) nanosheet/ Fe-MOF or Ti3C2Tx (MXene) nanosheet/ Cu-MOF layer was coated on a glass fiber separator to act as a polysulfides trapping layer. The MXenes layer with high conductivity and polar surface functional groups could confine polysulfides and accelerate the redox conversions. The porous MOF layer acts as a Li ion sieve, thereby leading to the interception of polysulfides and mitigation of Li dendrite growth. The cells with the Cu-MOF/MXenes and Fe-MOF/MXenes separators display superior capacities of 1100 and 1131 mA h g-1 after 300 cycles respectively whereas the cell with pure glass fiber separator delivers very low capacity of 309 mA h g-1 after 300 cycles. With Fe-MOF/MXenes and Cu-MOF/MXenes configurations, the discharge capacity, Coulombic efficiency, cycling stability, and electrochemical conversion reactions are significantly improved. Our ab initio calculations demonstrate that the MXene layer dissociates lithium polysulfides into adsorbed S and mobile Li ions, which explains the experimental findings.

Název v anglickém jazyce

Ti3C2Tx nanosheet@Cu/Fe-MOF separators for high-performance lithium-sulfur batteries: an experimental and density functional theory study

Popis výsledku anglicky

Lithium-sulfur (Li-S) batteries have attracted much attention due to their superior theoretical specific capacity and high theoretical energy density. However, rapid capacity fading originating from the shuttle effect, insulating the S cathode and the dendritic formation on the Li anode restrict the practical applications of Li-S batteries. Herein, we suggest novel coatings on glass fiber separators to satisfy all high-performance Li-S battery requirements. A conductive Ti3C2Tx (MXene) nanosheet/ Fe-MOF or Ti3C2Tx (MXene) nanosheet/ Cu-MOF layer was coated on a glass fiber separator to act as a polysulfides trapping layer. The MXenes layer with high conductivity and polar surface functional groups could confine polysulfides and accelerate the redox conversions. The porous MOF layer acts as a Li ion sieve, thereby leading to the interception of polysulfides and mitigation of Li dendrite growth. The cells with the Cu-MOF/MXenes and Fe-MOF/MXenes separators display superior capacities of 1100 and 1131 mA h g-1 after 300 cycles respectively whereas the cell with pure glass fiber separator delivers very low capacity of 309 mA h g-1 after 300 cycles. With Fe-MOF/MXenes and Cu-MOF/MXenes configurations, the discharge capacity, Coulombic efficiency, cycling stability, and electrochemical conversion reactions are significantly improved. Our ab initio calculations demonstrate that the MXene layer dissociates lithium polysulfides into adsorbed S and mobile Li ions, which explains the experimental findings.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Dalton Transactions

ISSN

1477-9226

e-ISSN

1477-9234

Svazek periodika

2023

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

82-92

Kód UT WoS článku

001111499600001

EID výsledku v databázi Scopus

2-s2.0-85180411690