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Synthesis of Grain‐like MoS2 for High‐Performance Sodium‐Ion Batteries
ChemSusChem ( IF 7.5 ) Pub Date : 2018-06-05 , DOI: 10.1002/cssc.201800512 Kai Yao 1 , Zhanwei Xu 1 , Zhi Li 2 , Xinyue Liu 1 , Xuetao Shen 1 , Liyun Cao 1 , Jianfeng Huang 1
ChemSusChem ( IF 7.5 ) Pub Date : 2018-06-05 , DOI: 10.1002/cssc.201800512 Kai Yao 1 , Zhanwei Xu 1 , Zhi Li 2 , Xinyue Liu 1 , Xuetao Shen 1 , Liyun Cao 1 , Jianfeng Huang 1
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MoS2 is a promising anode material for sodium‐ion batteries (SIBs) due to its attractive theoretical capacity and low cost. MoS2 generally presents a sheet‐like structure based on its (002) lattice plane; however, such a structure tends to result in agglomeration and stacking of the sheets that cannot accommodate volume expansion, resulting in poor cyclability. Herein, grain‐like MoS2 particulates (G‐MoS2) are synthesized by sulfiding MoO3 in highly concentrated sulfur vapor, which results in epitaxial growth of MoS2 in (002), (100), and (110) lattice planes, with the product consisting of MoS2 particulates of about 300 nm coated with few‐layered MoS2 nanosheets. The unique G‐MoS2 architecture ensures good dispersion and sufficient distance to accommodate volume expansion during sodiation/desodiation, which effectively prevents stacking of MoS2, maintaining structural stability. When employed as the working electrode for SIB, G‐MoS2 delivers a high reversible capacity of 324 mAh g−1 at 0.5 A g−1, retaining 312 mAh g−1 over 300 cycles with an average coulombic efficiency of 99.8 %. Even when G‐MoS2 is cycled at a high current density (2.0 A g−1), the retained capacity is 175 mAh g−1 after 400 cycles. Comparison with literature reveals that these capacities are among the more promising reversible values reported for pure MoS2.
中文翻译：
高性能钠离子电池用颗粒状MoS2的合成
MoS 2由于其极具吸引力的理论容量和低成本而成为一种有前景的钠离子电池（SIB）负极材料。MoS 2通常基于其（002）晶格面呈现片状结构。然而，这种结构趋向于导致不能容纳体积膨胀的片材的附聚和堆叠，从而导致差的可循环性。在此，通过在高浓度硫蒸气中硫化MoO 3来合成颗粒状MoS 2颗粒（G-MoS 2），这导致MoS 2在（002），（100）和（110）晶格平面中外延生长，产品由约300 nm的MoS 2微粒组成，并涂有很少层的MoS2纳米片。独特的G-MoS 2体系结构可确保良好的分散性和足够的距离，以适应在增盐/脱盐过程中的体积膨胀，从而有效地防止MoS 2堆叠，从而保持结构稳定性。当用作SIB的工作电极时，G-MoS 2在0.5 A g -1时可提供324 mAh g -1的高可逆容量，在300个循环中保持312 mAh g -1，平均库仑效率为99.8％。即使当以高电流密度（2.0 A g -1）循环G‐MoS 2时，保留容量仍为175 mAh g -1经过400个周期。与文献的比较表明，这些容量是纯MoS 2报道的更可逆的可逆值之一。
更新日期：2018-06-05
中文翻译：
高性能钠离子电池用颗粒状MoS2的合成
MoS 2由于其极具吸引力的理论容量和低成本而成为一种有前景的钠离子电池（SIB）负极材料。MoS 2通常基于其（002）晶格面呈现片状结构。然而，这种结构趋向于导致不能容纳体积膨胀的片材的附聚和堆叠，从而导致差的可循环性。在此，通过在高浓度硫蒸气中硫化MoO 3来合成颗粒状MoS 2颗粒（G-MoS 2），这导致MoS 2在（002），（100）和（110）晶格平面中外延生长，产品由约300 nm的MoS 2微粒组成，并涂有很少层的MoS2纳米片。独特的G-MoS 2体系结构可确保良好的分散性和足够的距离，以适应在增盐/脱盐过程中的体积膨胀，从而有效地防止MoS 2堆叠，从而保持结构稳定性。当用作SIB的工作电极时，G-MoS 2在0.5 A g -1时可提供324 mAh g -1的高可逆容量，在300个循环中保持312 mAh g -1，平均库仑效率为99.8％。即使当以高电流密度（2.0 A g -1）循环G‐MoS 2时，保留容量仍为175 mAh g -1经过400个周期。与文献的比较表明，这些容量是纯MoS 2报道的更可逆的可逆值之一。
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