Journal
MATERIALS TODAY ENERGY
Volume 25, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2022.100970
Keywords
Wet chemistry; Li2S2; Activation voltage; High area capacity; Long cycling performance
Funding
- National Natural Science Foundation of China [61904080, 92064010, 61801210, 91833302]
- National Key R&D Program of China [2020YFA0308900]
- Natural Science Foundation of Jiangsu Province [BK20190670]
- Natural Science Foundation of Colleges and Universities in Jiangsu Province [19KJB530008]
- Macau Young Scholars Program [AM2020005]
- High Performance Computing Cluster (HPCC) of Information and Communication Technology Office (ICTO) at University of Macau
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This study presents a single-atom tailoring strategy to design a liquid Li2S2 electrolyte, achieving a low activation voltage and excellent cycling stability, effectively addressing the safety concern and polysulfide migration issue in lithium-sulfur batteries.
The Li2S-based cathodes with a high theoretical capacity of 1,166 mAh/g are regarded as the commercially available lithium-sulfur battery that can be coupled with Li-free anodes to avoid the safety concern of lithium metal. However, the instinct Li2S passivation leads to a high activation potential and low sulfur utilization with the notorious polysulfide migration. Herein, the single-atom tailoring strategy in designing liquid Li2S2 catholyte is created without the use of any complicated manufacturing processes or additives, where the Li2S2 cell enables the 3.0 V activation voltage without potential barrier. Mean-while, the conductive and polar tungsten boride offer the active center to anchor polysulfides migration. As expected, the tungsten boride-Li2S2 cathode exhibits excellent cycling stability, impressive cycling performance without initial potential barrier. (C) 2022 Elsevier Ltd. All rights reserved.
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