阻燃聚磷酸铵/MXene装饰碳泡沫材料作为防火稳定锂硫电池的聚硫捕集器

IF 14 1区 化学 Q1 CHEMISTRY, APPLIED
Yang Li , Yong-Cheng Zhu , Sowjanya Vallem , Man Li , Seunghyun Song , Tao Chen , Long-Cheng Tang , Joonho Bae
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引用次数: 1

摘要

锂硫(li -硫)电池因其理论能量密度高、成本低而成为最有前途的现代能源供应系统之一。然而,高负载可燃性硫的高密度Li-S电池的发展面临着由于穿梭效应和火灾或爆炸事故的安全问题而导致电化学性能下降的挑战。在这项工作中,我们报道了一种三维(3D)导电的氮掺杂碳泡沫支撑的静电自组装mxene -聚磷酸铵(NCF-MXene-APP)层,该层作为Li-S电池的耐热、隔热、阻燃和独立的宿主,其合成方法简单且成本效益高。因此,通过使用锚定多硫化物的NCF-MXene-APP宿主,Li-S电池表现出出色的电化学性能,包括1191.6 mA h g- 1的高初始放电容量,1℃时755.0 mA h g- 1的优异倍率容量,以及2℃时每循环0.12%的极低容量衰减率的长期循环稳定性。更重要的是,这些电池可以在高温或火焰攻击条件下继续可靠地工作。因此,这项研究为安全高性能锂电池的设计提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Flame-retardant ammonium polyphosphate/MXene decorated carbon foam materials as polysulfide traps for fire-safe and stable lithium-sulfur batteries

Flame-retardant ammonium polyphosphate/MXene decorated carbon foam materials as polysulfide traps for fire-safe and stable lithium-sulfur batteries

Lithium-sulfur (Li-S) batteries are one of the most promising modern-day energy supply systems because of their high theoretical energy density and low cost. However, the development of high-energy density Li-S batteries with high loading of flammable sulfur faces the challenges of electrochemical performance degradation owing to the shuttle effect and safety issues related to fire or explosion accidents. In this work, we report a three-dimensional (3D) conductive nitrogen-doped carbon foam supported electrostatic self-assembled MXene-ammonium polyphosphate (NCF-MXene-APP) layer as a heat-resistant, thermally-insulated, flame-retardant, and freestanding host for Li-S batteries with a facile and cost-effective synthesis method. Consequently, through the use of NCF-MXene-APP hosts that strongly anchor polysulfides, the Li-S batteries demonstrate outstanding electrochemical properties, including a high initial discharge capacity of 1191.6 mA h g−1, excellent rate capacity of 755.0 mA h g−1 at 1 C, and long-term cycling stability with an extremely low-capacity decay rate of 0.12% per cycle at 2 C. More importantly, these batteries can continue to operate reliably under high temperature or flame attack conditions. Thus, this study provides valuable insights into the design of safe high-performance Li-S batteries.

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CiteScore
23.60
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