Micron-sized encapsulated-type MoS2/C hybrid particulates with an effective confinement effect for improving the cycling performance of LIB anodes
Micron-sized encapsulated-type MoS2/C hybrid particulates with an effective confinement effect for improving the cycling performance of LIB anodes
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微米级封装型MoS2/C杂化颗粒具有有效的限域效应，可改善锂离子电池负极的循环性能
DOI：
10.1039/c8ta00674a
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发表时间：
2018
影响因子：
11.9
通讯作者：
Zhang Di
中科院分区：
文献类型：
--
作者：
Sun Boya;Liu Qinglei;Chen Wenshu;Wang Ning;Gu Jiajun;Zhang Wang;u Huilan;Zhang Di
二硫化钼（MoS 2）作为锂离子电池的先进阳极材料具有很大的前景，但其电化学性能，特别是循环稳定性较差。在这里，我们报告的微米级颗粒组成的叠层型MoS 2/C混合纳米结构，提供了一个有效的限制效果，在循环反应过程中的可溶性中间产物，提供了一个物理上强大的框架和局部稳定的网站MoS 2为基础的电极反应在循环过程中。微米尺寸的MoS 2/C表现出在0.1 A g−1下平均1343 mA h g− 1的高比容量、优异的倍率性能（在1 A g−1下为929 mA h g− 1）和显著的循环稳定性，在1 A g−1下480次循环后保持1250 mA h g−1。此外，我们进一步阐明了在MoS 2纳米颗粒分解过程中S和Mo在碳基体中的均匀再分布，这表明了杂化结构的限制效应，从而导致电化学性能的增强，为实际应用中合理设计硫化物和硒化物基碳杂化电极提供了有意义的建议。
Molybdenum disulfide (MoS2) holds great promise as an advanced anode material for lithium ion batteries, but suffers from poor electrochemical performance, especially cycling stability. Here, we report micron-sized particulates composed of encapsulated-type MoS2/C hybrid nanostructures which provide an effective confinement effect to soluble intermediate products during cycling reactions, offering a physically robust framework and locally stable sites for MoS2-based electrode reactions during the cycling process. The micron-sized MoS2/C exhibits a high specific capacity of 1343 mA h g−1 on average at 0.1 A g−1, excellent rate performance (929 mA h g−1 at 1 A g−1), and remarkable cycling stability with 1250 mA h g−1 retention at 1 A g−1 after 480 cycles. In addition, we further clarify the uniform redistribution of S and Mo in the carbon matrix during the decomposition of MoS2 nanoparticles which demonstrates the confinement effect of hybrid structures thus leading to an enhanced electrochemical performance, providing a meaningful suggestion for the rational design of sulfide- and selenide-based carbon hybrid electrodes for practical applications.