Zhang Rui, Dong Xue, Peng Lechao, Kang Wenjun, Li Haibo
School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.
Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
Nanomaterials (Basel). 2018 Sep 17;8(9):733. doi: 10.3390/nano8090733.
Manganese monoxide (MnO) is a promising anode material in the lithium-ion battery for its high capacity, low operation potential, and environmental benignity. However, its application is impeded by poor rate capability and rapid capacity fading. In this work, a MnO/carbon hybrid material, in which small-sized MnO nanoparticles are tightly anchored on carbon fibers (denoted as MnO@CFs), was prepared by annealing the electrospun precursor fibers at 650 °C. When applied as the anode material of the Li-ion battery, the small size of MnO shortens the Li-ion diffusion path, and the carbon fibers not only greatly improve the conductivity but also efficiently buffer the MnO structure strain during the charge⁻discharge process, endowing the MnO@CFs electrode with a good rate capability (185 mAh g at 5 A g) and cyclic stability (406 mAh g after 500 cycles at 1.0 A g).
一氧化锰（MnO）因其高容量、低工作电位和环境友好性，是锂离子电池中一种很有前景的负极材料。然而，其倍率性能差和容量快速衰减阻碍了它的应用。在本工作中，通过在650℃下对电纺前驱体纤维进行退火处理，制备了一种MnO/碳复合材料，其中小尺寸的MnO纳米颗粒紧密地锚定在碳纤维上（记为MnO@CFs）。当用作锂离子电池的负极材料时，MnO的小尺寸缩短了锂离子扩散路径，碳纤维不仅大大提高了导电性，而且在充放电过程中有效地缓冲了MnO结构应变，赋予MnO@CFs电极良好的倍率性能（5 A g时为185 mAh g）和循环稳定性（1.0 A g下500次循环后为406 mAh g）。
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