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Tunnel Structure Enhanced Polysulfide Conversion for Inhibiting "Shuttle Effect" in Lithium-Sulfur Battery
Xiaotong Guo1,2, Xu Bi1,2, Junfeng Zhao1
1Laboratory of Advanced Light Alloy Materials and Devices, Yantai Nanshan University, Longkou 265713, China.
Nanomaterials (Basel, Switzerland)
|August 26, 2022
Summary
Researchers explored manganese oxides (MnO2) with different tunnel sizes to inhibit polysulfide shuttling in lithium-sulfur (Li-S) batteries. Larger tunnels in MnO2 demonstrated enhanced polysulfide adsorption, improving battery performance and cycle life.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries offer high energy density but suffer from polysulfide shuttle effects, causing capacity decay.
- Manganese oxides (MnO2) are known for their polysulfide-inhibiting properties due to their polar nature.
Purpose of the Study:
- To investigate the impact of tunnel size in 1D tunnel-type MnO2 structures on polysulfide adsorption.
- To develop a strategy for enhancing Li-S battery performance by optimizing cathode materials.
Main Methods:
- Screening of three types of tunnel-structured MnO2 materials.
- Evaluating polysulfide adsorption capacity based on tunnel size.
- Comparative cell tests to assess cycle reliability and rate performance.
Main Results:
- Larger tunnel sizes in MnO2 exhibited stronger chemisorption of polysulfides.
- Enhanced polysulfide conversion and anchoring were observed with optimized MnO2 structures.
- Li-S cells with larger tunnel MnO2 cathodes showed improved cycle stability and rate capability.
Conclusions:
- Controlling the tunnel size of MnO2 is a promising strategy for designing advanced Li-S battery cathodes.
- Optimized MnO2 structures effectively mitigate the polysulfide shuttle effect, enhancing battery longevity and performance.
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