Ni Single Atoms on Hollow Nanosheet Assembled Carbon Flowers Optimizing Polysulfides Conversion for Li?S Batteries |
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| Authors: | Rui Wang Jinlei Qin Fei Pei Zhizhan Li Pei Xiao Yunhui Huang Lixia Yuan Deli Wang |
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| Institution: | 1. Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074 P. R. China;2. State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074 P. R. China |
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| Abstract: | The sluggish conversion kinetics and shuttling behavior of lithium polysulfides (LiPSs) seriously deteriorate the practical application of lithium–sulfur (Li–S) batteries. Herein, Ni single atoms on hollow carbon nanosheet-assembled flowers (Ni-NC) are synthesized via a facile pyrolysis-adsorption process to address these challenges. The as-designed Ni-NC with enhanced mesoporosity and accessible surface area can expose more catalytic sites and facilitate electron/ion transfer. These advantages enable the Ni-NC-modified separator to exhibit both enhanced confinement-catalysis ability and suppressed shuttling of LiPSs. Consequently, the Li?S battery with Ni-NC-modified separator shows an initial capacity of 1167 mAh g?1 with a low capacity decay ratio (0.033% per cycle) over 700 cycles at 1 C. Even at the sulfur loading of 6.17 mg cm?2, a high areal capacity of 5.17 mAh cm?2 is realized at 0.1 C, together with superior cycling stability over 300 cycles. This work provides a facile catalyst design strategy for the development of high-performance Li?S batteries. |
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| Keywords: | battery separators lithium–sulfur batteries polysulfides conversion single-atom catalysts |
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