Fast redox conversion in lithium–sulfur batteries enabled by Cu-doped W18O49 with abundant oxygen defects
文献信息
Guojun Dong, Yanfei Yang
Lithium–sulfur (Li//S) batteries constitute promising high energy storage devices but suffer from serious Li polysulfide (LiPS) shuttle effect and sluggish redox conversion. Herein, we report that these challenges can be tackled successfully by introducing oxygen defects in W18O49via Cu doping. The oxygen defects in Cu-doped W18O49 (Cu/W18O49) are critical not only for enhancing the chemosorption toward LiPS but also for promoting the electrocatalytic conversion of LiPS. A reaction pathway for electrocatalytic conversion of LiPS to Li2S2/Li2S is proposed based on various analyses. As a result, the Cu/W18O49 modified PP (Cu/W18O49@PP) separator with a thin composite layer of 2.3 μm and 0.25 mg cm−2 displays high ionic conductivity, fast Li+ ion transport and super-electrolyte-philicity. The Li//S battery with the Cu/W18O49@PP separator shows superior cycling stability with a low capacity decay rate of 0.046% per cycle at 1 C over 300 cycles, up to 5 C discharge rate, and ultralow self-discharge behavior. Our work provides fresh insights into the design of electrocatalysts for fast redox conversion in advanced Li//S batteries.
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来源期刊
Journal of Materials Chemistry A

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











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