Yan Jing, Liu Min, Deng Nanping, Wang Liyuan, Sylvestre Alain, Kang Weimin, Zhao Yixia
State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes, School of Textile Science and Engineering, Tiangong University Tianjin 300387 China
University Grenoble Alpes, CNRS, Grenoble INP, G2Elab 38000 Grenoble France.
Nanoscale Adv. 2020 Dec 23;3(4):1136-1147. doi: 10.1039/d0na00690d. eCollection 2021 Feb 23.
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 electrospinning and 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.
对电气设备和车辆不断增长的需求推动了储能系统的快速发展。锂金属被认为是高性能电池最具前景的负极材料之一。然而，枝晶生长不均匀是阻碍锂金属负极在可充电锂电池中应用的主要难题之一。实现均匀的锂沉积对于解决这一问题至关重要。在本研究中，通过静电纺丝和MnO的生长，有效地制备了一种基于静电纺丝柔性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，以减少锂枝晶的生长。结果表明，植入的MnO对锂的吸引力、N掺杂剂的亲锂性质以及多孔结构的毛细作用力有利于MnO-PCNF中间层具有卓越的锂润湿性。此外，MnO-PCNF中间层的可湿润、稳定和导电结构能够很好地保持，为锂氧化还原反应提供快速的电荷转移，降低循环过程中的局部电流密度，并使沉积锂均匀分布。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，在高电流下展现出锂金属电池卓越的寿命。
