A low-self-discharge high-loading polysulfide cathode design for lithium–sulfur cells

文献情報

出版日 2023-11-01

DOI 10.1039/D3TA05632E

インパクトファクター 12.732

著者

Cheng-Che Wu, Yun-Chung Ho

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要旨

Lithium–sulfur batteries are a promising energy storage system with high energy density. However, during prolonged storage, they are prone to rapid capacity-fade, which is caused by severe self-discharge. This significantly shortens batteries' shelf life and impairs their long-term performance. This self-discharge effect has rarely been discussed in the literature. In this study, we develop a low-self-discharge polysulfide cathode with a carbonized electrospun nanofiber substrate. This cathode design achieves a high areal sulfur loading (4.03 mg cm−2) and a high sulfur content (66.8 wt%), while maintaining a low capacity-fade rate (0.26% per day) over a long storage time (90 days). In addition to the high capacity retention, it also maintains high lithium-ion diffusion coefficients after long-term storage. As a result, the rested low-self-discharge polysulfide cathode achieves a long cycle life (200 cycles) with stable electrochemistry. We further evaluate the long-term low-self-discharge performance of our lithium–sulfur cell via a series of quantitative analyses and performance analyses of the self-discharge behavior of the high-loading polysulfide cathode. The results provide key insights into the electrochemistry that occurs during the long-term storage of lithium–sulfur cells and into the low-self-discharge behavior of our designed cathode.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

A low-self-discharge high-loading polysulfide cathode design for lithium–sulfur cells

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