Facile Formation of a Solid Electrolyte Interface as a Smart Blocking Layer for High‐Stability Sulfur Cathode |
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| Authors: | Junling Guo Xinyu Du Xiaolong Zhang Fengxiang Zhang Jinping Liu |
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| Affiliation: | 1. State Key Laboratory of Fine Chemicals and School of Petroleum and Chemical Engineering, Dalian University of Technology, Liaodongwan New District, Panjin, P. R. China;2. School of Chemistry, Chemical Engineering and Life Science and State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, P. R. China |
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| Abstract: | The practical application of lithium–sulfur batteries (LSBs) is hindered by their poor cycle life, which stems mainly from the “redox shuttle reactions” of dissolved polysulfides. To develop a high‐performance cathode for LSBs, encapsulation of polysulfides with a blocking layer is potentially straightforward. Herein, a novel strategy is reported encapsulate sulfur and the electrolyte together in porous carbon spheres by using a solid electrolyte interface (SEI) that can selectively sieve Li+ ions while efficiently avoiding polysulfide accumulation and suppressing undesired polysulfide migration. This strategy is simple, straightforward, and effective. The carbon/sulfur cathode only needs to be cycled a few times within a voltage window of 0.3–1.0 V to form such a smart SEI, allowing the resulting cathode to exhibit superior stability extending 600 cycles. This strategy can be combined with other existing advanced sulfur cathode designs to improve the overall performance of LSBs. |
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| Keywords: | lithium polysulfide blocking Li– sulfur batteries solid electrolyte interfaces |
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