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MIL-100(V) and MIL-100(V)/rGO with various valence states of vanadium ions as sulfur cathode hosts for lithium-sulfur batteries
  • 时间:0
  • 分类:O[理学]
  • 作者机构:Key Laboratory of Colloid & Interface Chemistry (Shandong University), Ministry of Education and School of Chemistry and ChemicalEngineering, Shandong University, Jinan 250100, China
  • 相关基金:Acknowledgements This research is financial supported by the National Nature Science Foundation of China (No. 21471091), Academy of Sciences large apparatus United Fund (No. 11179043), the Fundamental Research Funds of Shandong University (No. 2015JC007), and the Taishan Scholar Project of Shandong Province (No. ts201511004).
中文摘要:

MIL-100 (V) 是由 trimesic 酸 ligands 和钒组成的无机器官的混合材料更整齐的 supertetrahedra。 MIL-100 (V)被期望为 Li-S 电池,不是仅仅因为它的唯一的 mesoporous 结构是为硫受精和一位优秀的硫阴极主人的一位好主人,而且由于有各种各样的原子价的钒离子的存在说,它能为不同路易斯提供酸地点并且允许和硫和锂 polysulfides 的强壮的相互作用。在这研究, mesoporous MIL-100 (V) 和 MIL-100 (V)/reduced graphene 氧化物(rGO ) composites 第一次为 Li-S 电池作为新奇主人被使用了。当为 Li-S 电池作为阴极测试了时, S@MIL-100 (V) 和 S@MIL-100 (V)/rGO 展出优秀电气化学的性能。S@MIL-100 (V) 阴极被表明了有 ~ 的一个可逆能力在 0.1 C 的 550 mAh/g (1 C = 1,675 mAh/g ) 在有低能力褪色 0.17% 每的 200 个周期以后骑车。而且,, S@MIL-100 (V)/rGO 在 0.5 C 在 75 个周期以后在 0.1 C 维持 650 mAh/g 的一个能力,能力在 300 个周期以后在 200 个周期和 450 mAh/g 以后在 500 mAh/g 被维持。上述结果表明 MIL-100 (V) 和为 Li-S 电池的主人有效地装的 MIL-100 (V)/rGO 的使用提高骑车的稳定性并且改进 Li-S 电池的电气化学的表演。

英文摘要:

MIL-100(V) is an inorganic-organic hybrid material composed of trimesic acid ligands and vanadium trimer supertetrahedra. MIL-100(V) is expected to be a good host for sulfur impregnation and an excellent sulfur cathode host for Li-S batteries, not only because of its unique mesoporous structure, but also owing to the presence of vanadium ions with various valence states, which can offer different Lewis acid sites and allow for strong interactions with sulfur and lithium polysulfides. In this study, mesoporous M1L-100(V) and MIL-100(V)/ reduced graphene oxide (rGO) composites have been applied as novel hosts for Li-S batteries for the first time. When tested as cathodes for Li-S batteries, both S@MIL-100(V) and S@MIL-100(V)/rGO exhibit excellent electrochemical performance. The S@MIL-100(V) cathode has been demonstrated to have a reversible capacity of -550 mAh/g at 0.1 C (1 C = 1,675 mAh/g) after 200 cycles with low capacity fading of 0.17% per cycle. Moreover, S@MIL-100(V)/rGO maintains a capacity of 650 mAh/g at 0.1 C after 75 cycles, whereas at 0.5 C, the capacity is maintained at 500 mAh/g after 200 cycles and 450 mAh/g after 300 cycles. The above results reveal that the use of MIL-100(V) and MIL-100(V)/rGO as hosts for Li-S batteries can effectively enhance the cycling stability and improve the electrochemical performance of Li-S batteries.

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