Chen Xin, Gao Guojun, Wu Zhipeng, Xiang Jun, Li Xiaoqiang, Guan Guangguang, Zhang Kaiyin
School of Science, Jiangsu University of Science and Technology Zhenjiang 212003 China
School of Physics and Electronic Engineering, Fuyang Normal University Fuyang 236037 China
RSC Adv. 2019 Nov 18;9(64):37556-37561. doi: 10.1039/c9ra07307h. eCollection 2019 Nov 13.
Flexible free-standing hierarchically porous carbon nanofibers embedded with ultrafine (∼3.5 nm) MoO nanoparticles (denoted as MoO@HPCNFs) have been synthesized by electrospinning and subsequent heat treatment. When evaluated as a binder-free anode in Li-ion batteries, the as-obtained MoO@HPCNFs film exhibits excellent capacity retention with high reversible capacity (≥1055 mA h g at 100 mA g) and good rate capability (425 mA h g at 2000 mA g), which is much superior to most of the previously reported MoO-based materials. The synergistic effect of uniformly dispersed ultrasmall MoO nanoparticles and a three-dimensionally hierarchical porous conductive network constructed by HPCNFs effectively improve the utilization rate of active materials, enhance the transport of both electrons and Li ions, facilitate the electrolyte penetration, and promote the Li storage kinetics and stability, thus leading to a greatly enhanced electrochemical performance.
通过静电纺丝和后续热处理合成了嵌入超细（约3.5纳米）MoO纳米颗粒的柔性自支撑分级多孔碳纳米纤维（表示为MoO@HPCNFs）。当作为锂离子电池的无粘结剂阳极进行评估时，所获得的MoO@HPCNFs薄膜表现出优异的容量保持率，具有高可逆容量（在100 mA g下≥1055 mA h g）和良好的倍率性能（在2000 mA g下为425 mA h g），这远远优于大多数先前报道的基于MoO的材料。均匀分散的超小MoO纳米颗粒与由HPCNFs构建的三维分级多孔导电网络的协同效应有效地提高了活性材料的利用率，增强了电子和锂离子的传输，促进了电解质渗透，并促进了锂存储动力学和稳定性，从而导致电化学性能大大增强。
