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Single-Crystal NCM-Enabled Multifunctional Separator Design for High-Performance Lithium-SPAN Batteries
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DOI：10.1002/smll.202513303.png)
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Abstract
En 中文
High-energy and sustainable batteries are key to a low-carbon future, and lithium-sulfur (Li-S) systems stand out for their high energy density, abundance, and low cost. Organo-polymer cathodes such as sulfurized polyacrylonitrile (SPAN) cathodes offer solid-state conversion and suppress polysulfide shuttling, yet their sluggish redox kinetics and limited active material utilization hinder practical performance. Herein, we introduce a multifunctional trilayer mixed-conduction separator that synergistically integrates ionic selectivity, kinetic facilitation, and interfacial stabilization. The separator, composed of single-crystal NCM811 (SC-NCM), BP2000 carbon, and Li-Nafion binder sandwiched between two polypropylene separators (PP|SC-NCM|PP), forms Li+-ion transport channels, interfacial charge redistribution, and promotes stable solid-state redox reactions (S to Li2S) within the SPAN cathode. This architecture enhances Li+ transference number (0.60), ionic conductivity (1.82 × 10−3 S·cm−1), and electrolyte uptake (68%), while suppressing thermal shrinkage and self-discharge. As a result, the cells deliver an initial discharge capacity of 1779 mAh·g−1 at 0.1C, retains 80% capacity after 500 cycles (1C), and sustain 771 mAh·g−1 at 10C (high-rate capability). This scalable, recyclable, and multifunctional separator offers a sustainable route to high-performance Li-S batteries and sets a precedent for mixed-conduction membrane designs in next-generation energy-storage technologies.
Keywords:
Li-BTJ coating
Li-nafion
lithium-sulfur batteries (Li-S)
mixed-conduction property
single-crystal NCM811(SC-NCM)
sulfurized polyacrylonitrile (SPAN)
trilayer composite separator
Journal
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12.1
Papers:
3.0W
Citations:
16.4W
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