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Engineering a TiNb2O7-Based Electrocatalyst on a Flexible Self-Supporting Sulfur Cathode for Promoting Li-S Battery
1National Base for International Science & Technology Cooperation, National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery, Hunan Province Key Laboratory of Electrochemical Energy Storage & Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, China.
This study introduces a novel catalyst for lithium-sulfur (Li-S) batteries, enhancing performance by reducing polysulfide shuttling and improving reaction kinetics. The new material demonstrates excellent capacity retention and efficiency for advanced energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries offer high theoretical energy density but face challenges like the polysulfide shuttle effect and poor kinetics.
- Existing materials struggle to overcome these limitations, hindering commercialization.
Purpose of the Study:
- To develop a novel catalyst for Li-S batteries to mitigate the shuttle effect and enhance electrochemical performance.
- To investigate the synergistic catalytic effect of TiNb2O7 (TNO) deposited on activated carbon cloth (ACC) for sulfur conversion.
Main Methods:
- Fabrication of a flexible self-supporting cathode using TNO nanoparticles on an activated carbon cloth (ACC@TNO).
- Hydrothermal reaction and high-temperature calcination to activate the ACC surface.
- Electrochemical testing to evaluate capacity, cycling stability, and rate performance.
Main Results:
- The ACC@TNO cathode demonstrated a high initial discharge capacity of 885 mAh g⁻¹ at 1 C.
- Achieved a capacity of 825 mAh g⁻¹ after 200 cycles with 93% retention and a low decay rate of 0.034% per cycle.
- The catalyst effectively inhibited the shuttle effect and boosted LiPS redox kinetics.
Conclusions:
- The ACC@TNO composite serves as an effective sulfur host, significantly improving Li-S battery performance.
- TNO's catalytic activity for LiPS conversion is demonstrated for the first time in Li-S batteries.
- This strategy offers a promising route for advancing Li-S battery technology.
