【摘 要】
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The notorious shuttle effect has long been obstructing lithium-sulfur (Li-S) batteries from yielding the expected high energy density and long lifespan.Herein,w
【机 构】
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Department of Materials Science and Engineering, China University of Mining & Technology (Beijing),
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The notorious shuttle effect has long been obstructing lithium-sulfur (Li-S) batteries from yielding the expected high energy density and long lifespan.Herein,we develop a multifunctional polysulfide barrier reinforced by the graphitic carbon nitride/carbon nanotube (g-C3N4/CNT) composite toward inhibited shuttling behavior and improved battery performance.The obtained g-C3N4 delivers a unique spongelike architecture with massive ion transfer pathways and fully exposed active interfaces,while the abundant C-N heteroatomic structures impose strong chemical immobilization toward lithium polysulfides.Combined with the highly conductive agent,the g-C3N4/CNT reinforced separator is endowed with great capability of confining and reutilizing the active sulfur within the cathode,thus contributing to an efficient and stable sulfur electrochemistry.Benefiting from these synergistic attributes,Li-S cells based on g-C3N4/CNT separator exhibit an excellent cyclability with a minimum decay rate of 0.03％ per cycle over 500 cycles and decent rate capability up to 2 C.Moreover,a high areal capacity of 7.69 mAh cm-2 can be achieved under a raised sulfur loading up to 10.1 mg cm-2,demonstrating a facile and efficient pathway toward superior Li-S batteries.
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