Facile synthesis of a interleaved expanded graphite-embedded sulphur nanocomposite as cathode of Li-S batteries with excellent lithium storage performance
Facile synthesis of a interleaved expanded graphite-embedded sulphur nanocomposite as cathode of Li-S batteries with excellent lithium storage performance
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轻松合成交错膨胀石墨嵌入硫纳米复合材料作为具有优异锂存储性能的锂硫电池正极
DOI：
10.1039/c2jm15041g
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Sun, Shi-Gang
中科院分区：
文献类型：
--
作者：
Wang, Yun-Xiao;Huang, Ling;Sun, Shi-Gang
本文报道了一种独特的交错膨胀石墨包硫纳米复合材料(S-EG)的熔融扩散法合成方法。S-EG材料的扫描电子显微镜图像表明，纳米复合材料是由具有层层结构的纳米片层组成的。电化学测试表明，含硫量为60%(0.6s-EG)的纳米复合材料在首次充放电倍率为280mAg(-1)时，首次放电容量可达1210.4 mAHg(-1)，50次充放电循环后容量仍高达957.9 mAHg(-1)。此外，在28Ag(-1)的充放电倍率下，0.6s-EG正极仍可提供337.5 mAHg(-1)的高可逆容量。0.6s-EG材料的高硫利用率、优异的倍率性能和减少过放电现象完全归因于阴极独特的微观结构和成分。
This paper reports the facile synthesis of a unique interleaved expanded graphite-embedded sulphur nanocomposite (S-EG) by melt-diffusion strategy. The SEM images of the S-EG materials indicate the nanocomposites consist of nanosheets with a layer-by-layer structure. Electrochemical tests reveal that the nanocomposite with a sulphur content of 60% (0.6S-EG) can deliver the highest discharge capacity of 1210.4 mAh g(-1) at a charge-discharge rate of 280 mA g(-1) in the first cycle, the discharge capacity of the 0.6S-EG remains as high as 957.9 mAh g(-1) after 50 cycles of charge-discharge. Furthermore, at a much higher charge-discharge rate of 28 A g(-1), the 0.6S-EG cathode can still deliver a high reversible capacity of 337.5 mAh g(-1). The high sulphur utilization, excellent rate capability and reduced over-discharge phenomenon of the 0.6S-EG material are exclusively attributed to the particular microstructure and composition of the cathode.