首页|Rational design of adsorption-catalysis functional separator for highly efficient Li-S batteries
Rational design of adsorption-catalysis functional separator for highly efficient Li-S batteries
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NSTL
Elsevier
The worldwide application of lithium-sulfur (Li–S) batteries is severely hampered by the low utilization of sulfur, rapid capacity fading, and poor rate performance. Herein, an efficient functional V2CTx/CNT framework is constructed and employed as an anchoring-catalysis modified layer of the separator to improve the performance of Li–S batteries. CNT acts as the foundation of the structure due to its impressive conductivity, continuous framework, and satisfactory mechanical stability, which provides a conductive surface and prevents the structure from collapsing during cycling progress as well. While V2CTx nanoribbons, strengthen the chemical anchoring to lithium polysulfides (LiPSs), facilitate the further conversions of the LiPSs in the liquid phase, and induce the Li2S homogeneous nucleation, restraining the shuttle effect and accelerating redox reactions. Benefiting from the anchoring-catalysis effect, the Li–S battery with V2CTx/CNT separator delivers an outstanding rate performance of 893.6 mAh g?1 at 2 C. The average capacity decay per cycle within 1000 cycles at 1 C is as low as 0.047%. This work provides a rewarding view to develop the practical application of Li–S batteries with a functional separator.
Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of Education School of Physics and Electronic Engineering Harbin Normal University
NSTL
Elsevier
