Recently, transition metal dichalcogenides (TMDs) have attracted considerable attention as anode materials in ultrafast lithium ion batteries because of their high theoretical capacity and outstanding ion diffusion kinetics. Despite these remarkable properties, TMDs exhibit fast capacity fading and insufficient Li storage kinetics, owing to the excessive volume expansion and low electric/ionic transfer rate.

The aim of this study is to reinforce the structural stability and Li storage kinetics of TMDs through the use of well-dispersed CoS₂ and WS₂ ultrasmall particles (USPs) embedded in hierarchical porous carbon nanofibers, including micro/mesoporous composite sturctures. As expected, this architecture offers a high specific capacity (718.0 mAh g⁻¹) with the capacity retention of 93.4% after 100 cycles at 0.1 A g⁻¹ owing to increased Li storage sites and prevention of volume expansion of CoS₂ and WS₂ USPs. In particular, a remarkable fast discharge capacity (444.5 mAh g⁻¹) with the capacity retention of 90.2% after 1000 cycles are noted. These results are related to the high number of Li ion storage sites, effective prevention of volume expansion of well-dispersed CoS₂ and WS₂ USPs, short Li ion diffusion length, and favorable Li ion acceptability, which is caused by the hierarchical porous structure containing meso/micropores.

近年来，过渡金属二硫化碳（TMD）作为超快锂离子电池的负极材料备受关注，因为它们具有很高的理论容量和出色的离子扩散动力学。尽管具有这些卓越的性能，但由于过大的体积膨胀和较低的电/离子传递速率，TMD表现出快速的容量衰减和不足的Li储存动力学。

这项研究的目的是通过使用均匀分散的CoS ₂和WS ₂超细颗粒（USP）嵌入分层的多孔碳纳米纤维（包括微孔/中孔复合结构）中，增强TMD的结构稳定性和Li储存动力学。如预期的那样，该架构提供了高比容量（718.0 mAh g ^-1），在0.1 A g ^-1下经过100次循环后，容量保持率为93.4％，这归因于锂存储位置的增加以及CoS ₂和WS ₂体积膨胀的防止美国药典。特别是卓越的快速放电容量（444.5 mAh g ^-1），在1000次循环后的容量保持率为90.2％。这些结果与锂离子储存位点的数量高，有效防止分散良好的CoS ₂和WS ₂ USP的体积膨胀，锂离子扩散长度短以及良好的锂离子接受性有关，这是由分层的多孔结构引起的包含介孔/微孔。