ABSTRACT
Lithium-sulfur batteries (LSBs) are extensively studied owing to their high theoretical capacity and low cost. However, the shuttle effect of lithium-sulfur batteries hinders their development. In this study, we obtained a modified separator to inhibit the shuttle effect through physical and chemical adsorption. The CoS2 nanosheets (CSNS) derived from a cobalt-based metal-organic framework (Co-MOF) were synthesized by a simple two-step method involving hydrothermal sulfurization and thermal decomposition. The material was then coated onto a Polypropylene (PP) separator using vacuum filtration and assembled into a LSB for systematic testing and research of its electrochemical performance and mechanism. Thanks to the intrinsic polarity of the CSNs and more active sites brought by the Co-MOF material, the modified separator has strong chemical adsorption and catalytic effects on polysulfides, anchoring and accelerating their conversion. When using the CSNs-PP separator, the LSB achieved a high initial capacity of 1002.4 mAh g−1 at 1 C, with only a 0.099% decay per cycle after 500 cycles. The modified separator effectively alleviating the shuttle effect, reducing internal resistance, weakening reaction polarization, and improving the specific capacity, stability, and reversibility of the battery.
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No potential conflict of interest was reported by the author(s).
Supplementary material
Supplemental data for this article can be accessed online at https://doi.org/10.1080/15567036.2024.2310741
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Notes on contributors
Xuefei Liu
Xuefei Liu works at China Construction Eighth Bureau Fourth Construction Co., Ltd.
Xiaotong Gao
Xiaotong Gao is a master’s student at Nanjing University of Science and Technology in China, with a research focus on the development of lithium/sodium ion batteries.
Jiaxuan Zou
Jiaxuan Zou graduated with a master’s degree from Nanjing University of Science and Technology in China, with a research focus on the development of positive electrode materials for sodium ion batteries.
Qiao Wu
Qiao Wu graduated with a master’s degree from Nanjing University of Science and Technology in China, with a research focus on the development of negative electrode materials for sodium ion batteries.
Wenju Wang
Wenju Wang is a professor and doctoral supervisor at Nanjing University of Science and Technology in China, with research interests in the development of lithium/sodium ion batteries and the application of new energy technologies.
Shaoliang Meng
Shaoliang Meng is a lecturer at Nanjing University of Science and Technology in China, specializing in the development and utilization of sodium ion batteries.
Yuqian Li
Yuqian Li is a lecturer at Nanjing University of Science and Technology in China, with a doctoral degree from Zhejiang University. His research focuses on the development of sodium ion batteries and the application of new energy technologies.
Xianzhong Tan
Xianzhong Tan, with a master’s degree, is currently a senior experimenter at the School of Energy at Nanjing University of Science and Technology in China.