Molybdenum disulfide nanosheets embedded in hollow nitrogen-doped carbon spheres for efficient lithium/sodium storage with enhanced electrochemical kinetics
Molybdenum disulfide nanosheets embedded in hollow nitrogen-doped carbon spheres for efficient lithium/sodium storage with enhanced electrochemical kinetics
复制标题
嵌入空心氮掺杂碳球中的二硫化钼纳米片可有效存储锂/钠并增强电化学动力学
DOI：
10.1016/j.electacta.2018.06.141
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发表时间：
2018
影响因子：
6.6
通讯作者：
He Deyan
中科院分区：
文献类型：
--
作者：
Guo Pengqian;Sun Kai;Liu Dequan;Cheng Pu;Lv Mingzhi;Liu Qiming;He Deyan
通过一种简便的合成方法制备了二硫化钼纳米片@中空掺氮碳(MoS2@NC)微球，并将其作为离子存储的主体材料进行了研究。当用于锂离子电池(LiBS)或钠离子电池(SIB)时，MoS_2@NC球电极表现出优异的电化学性能。当电流密度为200mA g−1时，循环100次后的容量为1386 mAHg 1。对于SIB，在1000mA g−1下循环400次后，容量仍保持在330 mAhg 1。这种优异的离子存储性能归因于MoS_2@NC球的层次化结构，它不仅提供了丰富的活性中心和有效的电子和离子通道，而且减缓了活性MoS_2材料的体积变化。同时，非均相组分、界面离子存储、氮掺杂和诱导缺陷的协同作用是MoS_2@NC电极高容量的原因。由于电导率的显著提高和MoS_2@NC球的较大比表面积，电极表现出增强的电化学动力学。
Molybdenum disulfide nanosheets@hollow nitrogen-doped carbon (MoS2@NC) spheres were prepared via a facile synthesis and investigated as a host material for ion storages. When used in lithium ion batteries (LIBs) or sodium ion batteries (SIBs), the MoS2@NC spheres electrodes exhibited excellent electrochemical performances. A high capacity of 1386 mAh g−1after 100 cycles was obtained at a current density of 200 mA g−1for LIBs. As for SIBs, a capacity of 330 mAh g−1was retained after 400 cycles at 1000 mA g−1. The remarkable ion storage performances can be attributed to the hierarchical architecture of the MoS2@NC spheres, which not only supply abundant active sites and efficient electron and ion pathways, but also alleviate the volume change of the active MoS2material. Meanwhile, synergistic effect of the heterogeneous components, interfacial ion storages, nitrogen doping and induced defects are responsible for high capacities of the MoS2@NC electrodes. And the electrodes exhibited enhanced electrochemical kinetics due to the significantly improved electrical conductivity and the large specific area of the MoS2@NC spheres.