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Rational engineering yolk-shell In2S3@void@carbon hybrid as polysulfide-absorbable sulfur host for high-performance
Yingyi Ding1, Zihan Shen2, Tianli Han1
1Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Provincial Engineering Laboratory of New-Energy Vehicle Battery Energy-Storage Materials, Anhui Key Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, PR China. jyliu@ahnu.edu.cn.
Abstract:
The slow redox kinetics and shuttling behavior of the intermediate lithium polysulfides constrain the further development of lithium-sulfur (Li-S) electrochemistry. A yolk-shell In2S3@void@carbon hybrid engineered to host the sulfur for Li-S batteries is prepared by using a multi-layered assembly method. The In2S3/electrolyte interface acted as powerful adsorption and activation sites for soluble polysulfides, which is demonstrated using density functional theory (DFT) calculations. Moreover, the carbon shell provides redundancy for volume-changes during the cycles. The results indicate that yolk-shell In2S3@S@C hybrid cathode shows good reversibility and rate capability, which preserves 563.6 mA h g-1 after 500 cycles at 0.5 C, indicating the potential for developing high-performance battery systems.
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