Graphene-Wrapped Sulfur Particles as a Rechargeable Lithium-Sulfur Battery Cathode Material with High Capacity and Cycling Stability
Graphene-Wrapped Sulfur Particles as a Rechargeable Lithium-Sulfur Battery Cathode Material with High Capacity and Cycling Stability
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DOI：
10.1021/nl200658a
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发表时间：
2011-07-01
期刊：
影响因子：
10.8
通讯作者：
Dai, Hongjie
中科院分区：
文献类型：
--
作者：
Wang, Hailiang;Yang, Yuan;Dai, Hongjie
我们报道了通过用炭黑纳米颗粒装饰的轻度氧化的氧化石墨烯片包裹聚乙二醇（PEG）涂覆的亚微米硫颗粒来合成石墨烯-硫复合材料。 PEG和石墨烯涂层对于适应放电过程中涂层硫颗粒的体积膨胀、捕获可溶性多硫化物中间体以及使硫颗粒导电非常重要。所得石墨烯硫复合材料在超过 100 次循环后表现出高且稳定的比容量，高达 600 mAh/g，是一种有前途的高能量密度可充电锂电池正极材料。
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 similar to 600 mAh/g over more than 100 cycles, representing a promising cathode material for rechargeable lithium batteries with high energy density.