Department of Chemistry, Stanford University, Stanford, California 94305, United States.
Nano Lett. 2011 Jul 13;11(7):2644-7. doi: 10.1021/nl200658a. Epub 2011 Jun 28.
We report the synthesis of a graphene-sulfur composite material by wrapping poly(ethylene glycol) (PEG) coated submicrometer sulfur particles with mildly oxidized graphene oxide sheets decorated by carbon black nanoparticles. The PEG and graphene coating layers are important to accommodating volume expansion of the coated sulfur particles during discharge, trapping soluble polysulfide intermediates, and rendering the sulfur particles electrically conducting. The resulting graphene-sulfur composite showed high and stable specific capacities up to ∼600 mAh/g over more than 100 cycles, representing a promising cathode material for rechargeable lithium batteries with high energy density.
我们报告了一种通过用碳黑纳米粒子修饰的轻度氧化石墨烯片包裹聚乙二醇（PEG）包覆的亚微米硫颗粒来合成石墨烯-硫复合材料的方法。PEG 和石墨烯包覆层对于在放电过程中容纳包覆的硫颗粒的体积膨胀、捕获可溶性多硫化物中间体以及使硫颗粒具有导电性非常重要。所得的石墨烯-硫复合材料在超过 100 个循环中表现出高达约 600 mAh/g 的高且稳定的比容量，代表了一种用于具有高能量密度的可再充电锂电池的有前途的正极材料。
