MoOx nanoparticles anchored on N-doped porous carbon as Li-ion battery electrode
MoOx nanoparticles anchored on N-doped porous carbon as Li-ion battery electrode
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锚定在氮掺杂多孔碳上的 MoOx 纳米颗粒作为锂离子电池电极
DOI：
10.1016/j.cej.2019.122588
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发表时间：
2020-02-01
影响因子：
15.1
通讯作者：
Zhao, Song
中科院分区：
文献类型：
--
作者：
Li, Zhi;Wang, Chao;Zhao, Song
过渡金属氧化物材料是锂离子电池(LiBS)的负极材料，有望取代石墨材料。本论文基于高效的原位络合和硬模板法制备了高分散的超小MoOx纳米颗粒。观察到MoOx纳米粒子的粒径在1.5~3.5 nm之间，锚定在3DN掺杂碳的表面。3D-MoOx@CN复合负极具有比容量高、抗循环稳定性好、电荷传输动力学快等特点。优化后的3D-MoOx@CN样品(3D-MoOx@CN-700)在1000次循环后的电流密度分别为100 mAg(-1)和431 mAg(-1)，比容量分别为742 mAhg(-1)和431 mAhg(-1)。观察到的优异性能是由于超小的MoOx纳米粒子具有独特的分级孔结构，与N掺杂的碳表面结合很强，可以避免纳米MoOx粒子在充放电过程中的团聚，缓解其体积膨胀。本工作所描述的复合电极材料在高性能锂离子电池的开发中具有巨大的潜力。同时，该合成方法为在层状多孔炭材料上制备其他高分散金属氧化物复合材料提供了一种通用策略。
Transition-metal oxides based materials have recently been shown to be promising anode material for lithium ion batteries (LIBs) application to replace graphite material. In the present work, highly dispersed ultra-small MoOx nanoparticles anchored on N-doped three-dimensional (3D) hierarchically porous carbon (3D-MoOx@CN) are prepared on the basis of an efficient in-situ chelating and hard-templating strategy. The MoOx nanoparticles with particle sizes between 1.5 and 3.5 nm are observed to be anchored on the surface of the 3D N-doped carbon. The 3D-MoOx@CN composite anode electrode exhibits several appealing characteristics for lithium ion storage, including high specific capacity, good stability against cycling and fast charge transport kinetics. An optimized 3D-MoOx@CN sample (3D-MoOx@CN-700) delivers specific capacities of 742 mAh g(-1) at current density of 100 mA g(-1) and 431 mAh g(-1) at 1000 mA g(-1) after 1000 cycles, respectively. The observed excellent performance is due to the unique hierarchical pore structure with strong binding of the ultra-small MoOx nanoparticles onto N-doped carbon surface, which can avoid the agglomeration and alleviate the volume expansion of MoOx nanoparticles in the charge-discharge process. The composite electrode material described in this work holds a great potential for the development of high-performance lithium-ion batteries. Meanwhile, the synthesis method presents a common strategy to prepare other composite materials with highly dispersed metal oxide on the hierarchically porous carbon materials.