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首页> 外文期刊>Journal of Applied Polymer Science >Electrochemical performance and thermal stability of the electrospun PTFE nanofiber separator for lithium-ion batteries
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Electrochemical performance and thermal stability of the electrospun PTFE nanofiber separator for lithium-ion batteries

机译：锂离子电池电纺PTFE纳米纤维分离器的电化学性能和热稳定性

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摘要

Separator is a very important set of lithium-ion batteries. At present, low porosity and poor thermal stability are two major disadvantages of separator. In this work, we first apply electrospinning method to prepare the Polytetrafluoroethylene (PTFE) nanofiber separator, which has the advantages of electrospinning method and PTFE materials. The effect of the PTFE nanofiber separator is investigated by scanning electron microscope, Capillary Flow Porometer, thermogravimetric-differential scanning calorimeter, linear sweep voltammeter, AC impedance, and charge/discharge cycling tests. The results demonstrate that the PTFE nanofiber separator has a special fiber structure made from PTFE particles gathering one by one along the fibers. Moreover, the PTFE nanofiber separator exhibits several advantages, including suitable pore diameter, uniform pore size distribution, high porosity, and electrolyte uptake, which enhance the ionic conductivity. The thermal stability of the PTFE nanofiber separator is much better than that of the conventional polyolefin separator. The Li/LiCoO2 cell equipped with PTFE nanofiber separator exhibits excellent rate performance and first charge-discharge specific capacity of 142 and 131 mAhg(-1), respectively, accompanied by relatively stable cycle performance at 0.2 C rate. It is supposed to be a candidate for application in lithium-ion batteries. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46508.
机译：分离器是一组非常重要的锂离子电池。目前，低孔隙率和差的热稳定性是分离器的两个主要缺点。在这项工作中，我们首先应用静电纺丝法制备聚四氟乙烯（PTFE）纳米纤维分离器，其具有静电纺丝方法和PTFE材料的优点。通过扫描电子显微镜，毛细管流量计，热重分电扫描量热计，线性扫描伏安计，AC阻抗和充电/放电循环试验研究了PTFE纳米纤维分离器的效果。结果表明，PTFE纳米纤维分离器具有由PTFE颗粒制成的特殊纤维结构，沿着纤维逐一收集。此外，PTFE纳米纤维分离器表现出几种优点，包括合适的孔径，均匀的孔径分布，高孔隙率和电解质吸收，这提高了离子电导率。 PTFE纳米纤维分离器的热稳定性远优于常规聚烯烃分离器的热稳定性。配备PTFE纳米纤维分离器的Li / LiCoO2细胞分别具有优异的速率性能和142和131mAhg（-1）的首次充电 - 放电特定容量，伴随着0.2℃的相对稳定的循环性能。它应该是锂离子电池中应用的候选者。 （c）2018 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2018,135,46508。

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