Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering, College of Chemistry, Nankai University, Tianjin 300071 (China).
Angew Chem Int Ed Engl. 2014 Nov 17;53(47):12794-8. doi: 10.1002/anie.201407898. Epub 2014 Sep 22.
MoS2 nanoflowers with expanded interlayer spacing of the (002) plane were synthesized and used as high-performance anode in Na-ion batteries. By controlling the cut-off voltage to the range of 0.4-3 V, an intercalation mechanism rather than a conversion reaction is taking place. The MoS2 nanoflower electrode shows high discharge capacities of 350 mAh g(-1) at 0.05 A g(-1) , 300 mAh g(-1) at 1 A g(-1) , and 195 mAh g(-1) at 10 A g(-1) . An initial capacity increase with cycling is caused by peeling off MoS2 layers, which produces more active sites for Na(+) storage. The stripping of MoS2 layers occurring in charge/discharge cycling contributes to the enhanced kinetics and low energy barrier for the intercalation of Na(+) ions. The electrochemical reaction is mainly controlled by the capacitive process, which facilitates the high-rate capability. Therefore, MoS2 nanoflowers with expanded interlayers hold promise for rechargeable Na-ion batteries.
具有扩展的（002）面层间距的 MoS2 纳米花被合成，并用作钠离子电池的高性能阳极。通过将截止电压控制在 0.4-3 V 的范围内，可以发生插层机制而不是转换反应。MoS2 纳米花电极在 0.05 A g-1 时具有 350 mAh g-1 的高放电容量，在 1 A g-1 时具有 300 mAh g-1 的放电容量，在 10 A g-1 时具有 195 mAh g-1 的放电容量。初始容量随循环增加是由于 MoS2 层的剥落，这为 Na+储存产生了更多的活性位点。在充放电循环中发生的 MoS2 层的剥离有助于提高钠离子嵌入的动力学和低能量势垒。电化学反应主要受电容过程控制，这有利于实现高倍率性能。因此，具有扩展层间距的 MoS2 纳米花有望用于可再充电的钠离子电池。
