Flexible MnO nanoparticle-anchored N-doped porous carbon nanofiber interlayers for superior performance lithium metal anodes,Nanoscale Advances

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Flexible MnO nanoparticle-anchored N-doped porous carbon nanofiber interlayers for superior performance lithium metal anodes
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-12-23 , DOI: 10.1039/d0na00690d
Jing Yan ₁ , Min Liu _{1,

2} , Nanping Deng ₃ , Liyuan Wang ₄ , Alain Sylvestre ₂ , Weimin Kang ₁ , Yixia Zhao ₁

Affiliation

The mounting requirements for electric apparatus and vehicles stimulate the rapid progress of energy storage systems. Lithium (Li) metal is regarded as one of the most prospective anodes for high-performance cells. However, the uneven dendrite growth is one of the primary conundrums that hampers the use of the Li metal anode in rechargeable Li batteries. Achieving even Li deposition is crucial to solve this concern. In this study, a stable interlayer based on electrospun flexible MnO nanoparticle/nitrogen (N)-doped (polyimide) PI-based porous carbon nanofiber (MnO–PCNF) films was effectively prepared via electrospinning and in situ growth of MnO to reduce the growth of Li dendrites. It is revealed that the attraction of implanted MnO towards Li, the lithiophilic nature of N dopants and the capillary force of porous architectures are beneficial to the preeminent Li wettability of the MnO–PCNF interlayer. Furthermore, the wettable, stable and conductive structure of the MnO–PCNF interlayer can be retained well, offering rapid charge transfer to Li redox reactions, reduced local current density during the cycling process and homogeneous distribution of deposited Li. Consequently, anodes with MnO–PCNF interlayers can relieve the volume change and inhibit the growth of Li dendrites, demonstrating a remarkable lifetime for lithium metal cells at high current.

中文翻译：

柔性 MnO 纳米颗粒锚定的 N 掺杂多孔碳纳米纤维中间层用于性能卓越的锂金属负极

对电气设备和车辆的安装要求刺激了储能系统的快速发展。锂 (Li) 金属被认为是最有前景的高性能电池负极之一。然而，不均匀的枝晶生长是阻碍锂金属负极在可充电锂电池中使用的主要难题之一。实现均匀的锂沉积对于解决这一问题至关重要。在这项研究中，通过静电纺丝和原位有效地制备了基于电纺柔性 MnO纳米颗粒/氮（N）掺杂（聚酰亚胺）PI 基多孔碳纳米纤维（MnO-PCNF）薄膜的稳定中间层。MnO 的生长以减少锂枝晶的生长。结果表明，注入的 MnO 对 Li 的吸引力、N 掺杂剂的亲锂性质和多孔结构的毛细管力有利于 MnO-PCNF 夹层的卓越的 Li 润湿性。此外，MnO-PCNF中间层的可润湿、稳定和导电结构可以很好地保留，提供快速电荷转移到锂氧化还原反应，降低循环过程中的局部电流密度和沉积锂的均匀分布。因此，具有 MnO-PCNF 中间层的负极可以缓解体积变化并抑制锂枝晶的生长，证明锂金属电池在大电流下具有显着的寿命。

更新日期：2021-01-21

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