.png){kind=icon}
.png){kind=icon}
Return
Synergistic SnSe2@Ti3C2Tx MXene Heterostructured Separator for Highly Efficient Polysulfide Adsorption, Catalytic Redox Acceleration, and Enhanced Electrochemical Stability in Advanced Lithium–Sulfur Batteries
.png){kind=icon}
OA
AI
A
M
R
DOI：10.1002/eem2.70173.png)
.png){kind=icon}
.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Lithium–sulfur (Li–S) batteries hold tremendous promise for next-generation energy storage due to their high theoretical energy density and low cost. However, commercialization is hindered by severe polysulfide shuttling, sluggish redox kinetics, and rapid capacity decay under practical loading conditions. Herein, we report a rationally engineered SnSe2@Ti3C2Tx MXene heterostructure as a multifunctional separator coating that synergistically combines strong Lewis acidic adsorption sites with catalytic interfaces and a highly conductive, polar-terminated MXene matrix. The SnSe2 nanosheets provide abundant catalytic centers to accelerate the redox conversion of soluble Li2Sx species, while Ti3C2Tx ensures rapid electron transport and robust chemical immobilization of polysulfide intermediates. This interfacial synergy effectively suppresses the shuttle effect, lowers electrochemical polarization, and promotes rapid charge transfer. Electrochemical evaluations reveal an initial discharge capacity of 1626 mAh g−1 at 0.2 C with nearly 100% Coulombic efficiency. Under high sulfur loading (5 mg cm−2) and lean-electrolyte conditions (E/S = 6 μL mg−1), cells with the SnSe2@MXene-coated separator deliver 751 mAh g−1 after 120 cycles, retaining 70.9% of their initial capacity. Remarkably, long-term cycling at 1 C exceeds 1000 cycles with 44.4% capacity retention and minimal structural degradation. This work demonstrates a scalable, effective separator-engineering strategy, establishing SnSe2@MXene as a promising platform for practical, high-energy-density Li–S batteries.
Keywords:
cycling stability
high sulfur loading
lithium–sulfur batteries
polysulfide shuttle effect
SnSe2@MXene heterostructure
AI Summary
Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.
Journal
IF:
14.1
Papers:
1.1K
Citations:
9.8K
Organization
Cited Papers