Xiaoyan Song*, Wanchun Huang, Hao Wang, Yi Ming Lu and Jinfeng Xing,
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The PI/MOF-5 separator demonstrated a high number of lithium-ion transferences (<i>t</i><sub>Li</sub><sup>+</sup> = 0.79). The cell using the PI/MOF-5 separator exhibited excellent cycling performance, with an initial discharge capacity of 174.7 mA h/g at a current density of 0.5 C, which is 140.8 and 46.6% higher than that of the LIB coin cell with a polypropylene (PP) separator and PI separator, respectively. After 200 cycles at a current density of 0.5 C, the specific discharge capacity of the battery using the PI/MOF-5 separator still maintained 89.02% of the initial specific discharge capacity, which is higher than that of the PP and PI separators. 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引用次数: 0
摘要
锂离子电池(LIBs)的安全性和性能与隔膜密切相关。商用聚烯烃分离器阻碍了电化学性能,并且由于热稳定性和电解质润湿性不足,可能导致高温下的安全问题。本文采用原位聚合和静电纺丝法制备了聚酰亚胺(PI)/金属-有机骨架-5 (MOF-5)复合隔膜。PI/MOF-5复合膜的拉伸强度比PI膜高104%。PI/MOF-5复合隔膜出色的阻燃性能显著提高了锂离子电池的安全性,特别是在高温环境下。PI/MOF-5隔膜具有较高的锂离子转移率(tLi+ = 0.79)。使用PI/MOF-5隔膜的电池具有良好的循环性能,在0.5 C的电流密度下,电池的初始放电容量为174.7 mA h/g,比使用聚丙烯(PP)隔膜的电池和使用PI隔膜的电池分别高出140.8%和46.6%。在0.5 C电流密度下循环200次后,使用PI/MOF-5隔膜的电池比放电容量仍保持在初始比放电容量的89.02%,高于PP和PI隔膜。因此,PI/MOF-5复合分离器的优异性能表明其在高性能锂离子电池中的潜力。
Polyimide/Metal–Organic Framework-5 Separator with Excellent Electrolyte Wettability and Thermal Stability for High Performance Lithium-Ion Battery
The safety and performance of lithium-ion batteries (LIBs) are closely related to the separator. Commercial polyolefin separators hinder electrochemical performance and may result in safety issues at high temperatures due to insufficient thermal stability and electrolyte wettability. In this work, a polyimide (PI)/metal–organic framework-5 (MOF-5) composite separator was prepared via in situ polymerization and electrospinning. The tensile strength of the PI/MOF-5 composite membrane was superior to that of the PI membrane by 104%. The outstanding flame retardancy of the PI/MOF-5 composite separator significantly enhances the safety of lithium-ion batteries, especially in high-temperature environments. The PI/MOF-5 separator demonstrated a high number of lithium-ion transferences (tLi+ = 0.79). The cell using the PI/MOF-5 separator exhibited excellent cycling performance, with an initial discharge capacity of 174.7 mA h/g at a current density of 0.5 C, which is 140.8 and 46.6% higher than that of the LIB coin cell with a polypropylene (PP) separator and PI separator, respectively. After 200 cycles at a current density of 0.5 C, the specific discharge capacity of the battery using the PI/MOF-5 separator still maintained 89.02% of the initial specific discharge capacity, which is higher than that of the PP and PI separators. Consequently, the outstanding properties of the PI/MOF-5 composite separator indicate its potential in high-performance lithium-ion batteries.
期刊介绍:
ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers.
The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.