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Self-assembly of MoO3-decorated carbon nanofiber interlayers for high-performance lithium-sulfur batteries.
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020-01-08 , DOI: 10.1039/c9cp06287d
Huilan Li 1 , Xiaofei Wang 1 , Chu Qi 1 , Chengcheng Zhao 1 , Cuimei Fu 1 , Lina Wang 1 , Tianxi Liu 1
Affiliation  

Lithium-sulfur (Li-S) batteries are attractive for next-generation energy storage systems due to their high theoretical capacity and energy density. However, the undesired shuttling of soluble lithium polysulfides (Li2Sn, 2 < n≤ 8) and the uncontrolled growth of lithium dendrites have hindered their practical applications. Herein, a self-assembled freestanding MoO3/carbon nanofiber (MoO3/CNF) composite membrane is effectively integrated into Li-S batteries as a functional interlayer. Improved cell performance is achieved due to the strong interfacial chemical and physical interactions between the interlayers with Li2Sn. The Li-S batteries exhibit a decent cyclic stability with a fading rate of 0.12% per cycle for 500 cycles at 1675 mA g-1, a high rate performance and a low self-discharge rate. In this rational design, the CNF network provides abundant electron pathways and physically prevents polysulfide diffusion. The polar MoO3 nanorods act as effective anchoring sites by the chemical interactions with Li2Sn. Meanwhile, the suppressed Li-dendrite growth on the Li-anode surface results in a stable Li stripping/plating.

中文翻译:

用于高性能锂硫电池的MoO3装饰的碳纳米纤维中间层的自组装。

锂硫(Li-S)电池具有较高的理论容量和能量密度,因此对下一代储能系统具有吸引力。但是,可溶性多硫化锂(Li2Sn,2 <n≤8)的不期望的穿梭和锂树枝状晶体的不受控制的生长阻碍了它们的实际应用。在此,将自组装的独立式MoO3 /碳纳米纤维(MoO3 / CNF)复合膜有效地集成到Li-S电池中作为功能中间层。由于中间层与Li2Sn之间的强界面化学和物理相互作用,因此可以提高电池性能。Li-S电池表现出良好的循环稳定性,在1675 mA g-1的条件下,每500个循环的循环衰变率为0.12%,具有高倍率性能和低自放电率。在这个合理的设计中,CNF网络提供了丰富的电子路径,并在物理上阻止了多硫化物的扩散。极性的MoO3纳米棒通过与Li2Sn的化学相互作用充当有效的锚固位点。同时,在锂阳极表面上抑制的锂枝晶生长导致稳定的锂剥离/镀覆。
更新日期:2020-01-08
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