Single-atom tailoring of Li2S to Form Li2S2 for building better lithium-sulfur batteries

Zha, Chenyang, Wang, Shuo, Liu, Chang, Zhao, Yuwei, He, Bingchen, Lyu, Chongguang, Li, Junfeng, Ji, Shunping, Chen, Shi, Hui, Kwan San ORCID: and Hui, Kwun Nam (2022) Single-atom tailoring of Li2S to Form Li2S2 for building better lithium-sulfur batteries. Energy Storage Materials, 47. pp. 79-86. ISSN 2405-8297

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The Li2S-based cathodes to couple with Li-free anodes are regarded as a commercially available approach to overcome the safety risk of lithium metal anodes. However, the passivated Li2S instinct leads to a high activation potential in the initial charging process, and the notorious shuttle effect of polysulfide is inevitable upon cell cycling. Here we create a single atom tailoring strategy by comproportionation reactions (Li2S + 1/8S8 = Li2S2) to form the Li2S2 materials without any complex manufacturing process or additives, where the Li2S2 cell enables a lower potential barrier and allows for the 3.0 V activation voltage without any other material modification. Meanwhile, the polar conducting material TaB2 is introduced to restrain the migration of polysulfides, and provide fast redox reaction kinetics. With those ingenious tailoring of cell designs, the Li2S2-TaB2 cell (Li2S2: 88 wt%) exhibits high areal capacity (4.6 mAh/cm2 at 6.0 mg/cm2 Li2S2 loading), excellent cycling stability (500 cycles at 1.6 mA/cm2).

Item Type: Article
Additional Information: Funding Information: This research was supported by the National Natural Science Foundation of China (Grant No. 61904080 ), the Natural Science Foundation of Jiangsu Province (Grant No. BK20190670 ), the Natural Science Foundation of Colleges and Universities in Jiangsu Province (Grant No. 19KJB530008), the Technology Innovation Project for Overseas Scholar in Nanjing, the Start-up Foundation of Nanjing Tech University, the Macau Young Scholars Program (AM2020005), the Science and Technology Development Fund of Macau SAR (File nos. 0191/2017/A3, 0041/2019/A1, 0046/2019/AFJ, 0021/2019/AIR), University of Macau (File nos. MYRG2017-00216-FST , MYRG2018-00192-IAPME , and SRG2018-00140-IAPME ), the UEA funding, the DFT calculations are performed at High Performance Computing Cluster (HPCC) of Information and Communication Technology Office (ICTO) at University of Macau. Publisher Copyright: © 2022 Elsevier B.V.
Uncontrolled Keywords: renewable energy, sustainability and the environment,materials science(all),energy engineering and power technology,sdg 7 - affordable and clean energy ,/dk/atira/pure/subjectarea/asjc/2100/2105
Faculty \ School: Faculty of Science > School of Engineering
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Depositing User: LivePure Connector
Date Deposited: 25 Apr 2024 10:32
Last Modified: 25 Apr 2024 10:32
DOI: 10.1016/j.ensm.2022.02.001


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