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Realizing All-Climate Li-S Batteries by Using a Porous Sub-Nano Aromatic Framework
Jie Xu1,2, Hui Zhang1, Fengtao Yu3
1Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai, 200433, China.
Angewandte Chemie (International Ed. in English)
|October 4, 2022
Summary
This study introduces an all-climate lithium-sulfur (Li-S) battery using a novel separator. The modified separator enables stable Li-S battery operation across a wide temperature range, from -40 to 60°C.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries offer high energy density but suffer from poor performance at extreme temperatures due to slow redox kinetics and polysulfide shuttling.
- Implementing wide-temperature Li-S batteries requires addressing these limitations for practical applications.
Purpose of the Study:
- To develop an all-climate Li-S battery capable of operating efficiently across a broad temperature spectrum.
- To enhance the electrochemical performance and stability of Li-S batteries by mitigating polysulfide shuttling and improving low-temperature kinetics.
Main Methods:
- Modification of a separator with a porous sub-nano aromatic framework (SAF-3) in an ether-based electrolyte.
- Characterization of SAF-3 properties, including pore size (0.97 nm) and band gap (1.72 eV).
- Testing of the modified Li-S cells under various temperature conditions (-40 to 60°C) and cycling at room temperature with high sulfur loading and lean electrolyte.
Main Results:
- The SAF-3 modified separator effectively suppressed polysulfide shuttling at high temperatures.
- The material enhanced polysulfide conversion kinetics at low temperatures.
- SAF-3 modified cells demonstrated stable operation from -40 to 60°C.
- At room temperature, the modified cell achieved 90% capacity retention over 100 cycles with high sulfur loading (5.0 mg cm⁻²) and lean electrolyte (5 μL mg⁻¹).
Conclusions:
- The developed porous sub-nano aromatic framework (SAF-3) modified separator is a promising strategy for creating all-climate Li-S batteries.
- This approach effectively addresses the critical challenges of polysulfide shuttling and low-temperature kinetics, paving the way for robust wide-temperature energy storage solutions.
