3D Macroporous MoxC@N-C with Incorporated Mo Vacancies as Anodes for High-Performance Lithium-Ion Batteries
3D Macroporous MoxC@N-C with Incorporated Mo Vacancies as Anodes for High-Performance Lithium-Ion Batteries
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掺有 Mo 空位的 3D 大孔 MoxC@N-C 作为高性能锂离子电池的阳极
DOI：
10.1002/smtd.201800040
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发表时间：
2018-08-14
期刊：
影响因子：
12.4
通讯作者：
Xu, Jiantie
中科院分区：
文献类型：
--
作者：
Liu, Shenghong;Li, Feng;Xu, Jiantie
较高的电子导电率、较低的平均工作电压和较高的理论容量使碳化钼材料有望成为锂离子电池的负极材料。除了增加额外的活性中心数量外，进一步提高活性中心的比活性也是提高碳化钼电极电化学性能的有效途径。本文以一种简单的方法设计并合成了一系列具有丰富Mo空位、高活性中心比活性和氮掺杂碳(N-C)涂层的三维交联型大孔MoxC@N-C纳米晶。MoxC@N-C-2.5具有良好的三维结构，有利于Li+的快速传输和额外存储，在0.0 5A g(-1)下表现出高的初始可逆容量879.3 mAhg(-1)。此外，MoxC@N-C-2.5在0.5Ag(-1)下的放电容量为825.3 mAhg(-1)，200次循环后的初始容量保持率为61.9%。正如预期的那样，这一简单的策略可以扩展到其他具有丰富缺陷、大量多孔结构和杂原子掺杂碳涂层作为电极的纳米复合材料的制备，从而获得高性能的锂离子电池。
High electronic conductivity, low average working voltage, and high theoretical capacities enable molybdenum carbide-based materials as promising anodes for lithium-ion batteries (LIBs). Apart from the increase in the number of additional active sites, further enhancement in the specific activity of the active sites is also an effective way to improve the electrochemical performance of the molybdenum carbide-based electrodes. Here, a series of 3D cross-linked macroporous MoxC@N-C nanocrystals with rich incorporated Mo vacancies, high specific activity of active sites, and nitrogen-doped carbon (N-C) coating are designed and synthesized using a simple method. Benefitting from its 3D robust structures for the rapid transporting and additional storage of Li+, the MoxC@N-C-2.5 displays a high initial reversible capacity of 879.3 mAh g(-1) at 0.05 A g(-1). Moreover, the MoxC@N-C-2.5 shows a high discharge capacity of 825.3 mAh g(-1) at 0.5 A g(-1) with an initial capacity retention of 61.9% after 200 cycles. As expected, this facile strategy can be extended to the fabrication of other nanocomposites with rich defects, numerous porous structures, and heteroatoms doped carbon coating as electrodes toward high-performance LIBs.