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Lithiophilic 3D VN@N-rGO as a Multifunctional Interlayer for Dendrite-Free and Ultrastable Lithium-Metal Batteries

机译:Lithiophilic 3D VN @ N-RGO作为树突和无抗体锂金属电池的多功能夹层

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摘要

It is still a big challenge to effectively suppress dendrite growth, which increases the safety and life of lithium-metal-based high energy/power density batteries. To address such issues, herein we design and fabricate a lithiophilic VN@N-rGO as a multifunctional layer on commercial polypropylene (PP) separator, which is constructed by a thin N-rGO nanosheet-wrapped VN nanosphere with a uniform pore distribution, relatively high lithium ionic conductivity, excellent electrolyte wettability, additional lithium-ion diffusion pathways, high mechanical strength, and reliable thermal stability, which are beneficial to regulate the interfacial lithium ionic flux, resulting in the formation of a stable and homogeneous current density distribution on Li-metal electrodes and hard modified separators that can resist dendrites piercing. Consequently, the growth of Li dendrite is effectively suppressed, and the cycle stability of lithium-metal batteries is significantly improved. In addition, even at a high current density of 10 mA cm(-2) and cutoff areal capacity of 5 mAh cm(-2), the Li vertical bar Li symmetric batteries with VN@N-rGO/PP separators still work very well even over 2500 h, exhibiting ultrahigh cycling stability. This work presents rational design ideas and a facile fabrication strategy of a lithiophilic 3D porous multifunctional interlayer for dendrite-free and ultrastable lithium-metal-based batteries.
机译:有效抑制枝晶生长,提高锂金属基高能/功率密度电池的安全性和寿命,仍然是一个巨大的挑战。为了解决这些问题,我们在此设计并制造了一种亲锂材料VN@N-rGO作为商用聚丙烯(PP)分离器上的多功能层,由薄的N-rGO纳米片包裹的VN纳米球构成,具有均匀的孔分布、相对较高的锂离子电导率、优异的电解质润湿性、额外的锂离子扩散途径、高机械强度和可靠的热稳定性,这有助于调节界面锂离子通量,从而在锂金属电极和硬改性隔板上形成稳定、均匀的电流密度分布,防止树枝晶穿透。因此,有效地抑制了锂树枝晶的生长,显著提高了锂金属电池的循环稳定性。此外,即使在10毫安厘米(-2)的高电流密度和5毫安厘米(-2)的截止面积容量下,锂垂直杆锂对称电池也具有VN@N-rGO/PP分离器即使在2500小时以上仍能很好地工作,表现出超高的循环稳定性。本文提出了一种用于无枝晶和超稳定金属锂电池的三维多孔多功能中间层的合理设计思想和简易制造策略。

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