High-performance sodium-ion hybrid capacitors based on an interlayer-expanded MoS2/rGO composite: surpassing the performance of lithium-ion capacitors in a uniform system
High-performance sodium-ion hybrid capacitors based on an interlayer-expanded MoS2/rGO composite: surpassing the performance of lithium-ion capacitors in a uniform system
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基于层间膨胀MoS2/rGO复合材料的高性能钠离子混合电容器：在均匀系统中超越锂离子电容器的性能
DOI：
10.1038/s41427-018-0073-y
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发表时间：
2018-08-20
影响因子：
9.7
通讯作者：
Huang, Zheng-Hong
中科院分区：
文献类型：
--
作者：
Zhan, Changzhen;Liu, Wei;Huang, Zheng-Hong
混合型超级电容器（HSCs）是一种兼具电池和超级电容器特点的新型、有前途的装置。在本文中，我们报告了基于层间膨胀的MoS 2/rGO复合材料的HSC（均匀系统中的Li-HSC和Na-HSC），其显示出更高的能量密度和功率密度以及上级的循环稳定性。合成了三维网络结构的层间膨胀MoS 2/rGO纳米复合材料（3D-IEMoS 2 @G）并用作阳极。由于石墨烯骨架框架的3D结构提供了足够的电荷，并且高度层间膨胀的MoS 2实现了快速离子扩散，因此所制备的复合材料作为LIB和SIB的阳极材料表现出优异的性能（对于LIB，在100 mA g（-1）下为1600 mAh g（-1）;在100 mAh g（-1）下为580 mAh g（-1），在10 A g（-1）的高电流密度下为320 mAh g（-1））。当与氮掺杂的分级多孔3D石墨烯（N-3DG）配对时，所获得的Na-HSC在均匀体系中超过Li-HSC，在630 Wkg（-1）下显示出140 Wh kg（-1）的优异性能，43 Whkg（-1），在103 kW kg（-1）的最大功率密度下（在1.5 s内完成充电），并且在超过10000次循环后没有明显的容量衰减。因此，进行定量动力学分析，以了解混合超级电容器中两个电极的协同效应以及离子的影响，并进一步为制造高性能HSC铺平道路。
Hybrid supercapacitors (HSCs) are novel, promising devices having features of both batteries and supercapacitors. Herein, we report HSCs (Li-HSC and Na-HSC in a uniform system) based on an interlayer-expanded MoS2/rGO composite that show ultrahigh energy density and power density as well as superior cycle stability. The 3D network-structured interlayer-expanded MoS2/rGO nanocomposite (3D-IEMoS2@G) was synthesized and employed as the anode. Because the 3D architecture of the graphene skeleton frame delivered sufficient charges and the highly interlayer-expanded MoS2 achieved fast ion diffusion, the as-prepared composite exhibited excellent performance as the anode material for both LIBs and SIBs (1600 mAh g(-1) at 100mA g(-1) for the LIB; 580 mAh g(-1) at 100 mAh g(-1) and 320 mAh g(-1) at a high current density of 10 A g(-1)). When paired with nitrogen-doped hierarchically porous 3D graphene (N-3DG), the obtained Na-HSC surpassed Li-HSC in a uniform system, showing an excellent performance of 140 Wh kg(-1) at 630 Wkg(-1), 43 Whkg(-1) at an ultrahigh power density of 103 kW kg(-1) (charge finished within 1.5 s) and no distinct capacity attenuation after over 10000 cycles. Thus, a quantitative kinetic analysis was performed to understand the synergistic effect of the two electrodes and the resulting effect of ions in the hybrid supercapacitors and to further pave a general path for fabricating high-performance HSCs.