Due to their unique and promising microstructures, sulfur/graphene aerogel composites have become more appealing for research interests than pristine carbon materials to improve the electrochemical performances of cathodes in lithium–sulfur batteries. Herein, we presented a facile no-slurry method to synthesize a three-dimensional polyvinylpyrrolidone–sulfur/graphene aerogel composite, which can be pressed into flexible sheets and directly used as a cathode without any additives. With a superior microstructure and high electrical conductivity, the as prepared cathode enables a high areal sulfur loading of 2.8 mg cm?2, which delivers an initial gravimetric specific capacity of 1192.6 mA h g?1 and an areal specific capacity of 3.34 mA h cm?2 at 0.1C. After the first few cycles and stabilization, the cathode exhibits an excellent capacity retention of 94.6% from the 10th to 50th cycle, together with a great rate capability and cycling stability for 200 cycles at 0.5C. Moreover, this no-slurry method is convenient to be integrated with other composites, which has the potential to further improve the performances of lithium–sulfur batteries and simplify the preparation process.
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机译：由于其独特而有希望的微观结构，硫/石墨烯气凝胶复合材料已比原始碳材料更能吸引研究兴趣，以改善锂硫电池中阴极的电化学性能。在此，我们提出了一种简便的无浆法来合成三维聚乙烯吡咯烷酮-硫/石墨烯气凝胶复合材料，该复合材料可压制成柔性片材，而无需任何添加剂即可直接用作阴极。制备的阴极具有优异的微观结构和高电导率，能够实现2.8 mg cm ？2 的高面积硫负载，可提供1192.6 mA的初始重量比容量hg ？1 ，在0.1C时的面积比容量为3.34 mA h cm ？2 。经过最初的几个循环和稳定之后，从第10 到50 < / small>周期，以及出色的速率能力和0.5C下200个周期的循环稳定性。而且，这种无浆方法很容易与其他复合材料集成，从而有可能进一步改善锂硫电池的性能并简化制备过程。
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