Development of electrospun PVdF-PAN membrane-based polymer electrolytes for lithium batteries
Development of electrospun PVdF-PAN membrane-based polymer electrolytes for lithium batteries
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DOI：
10.1016/j.memsci.2008.08.047
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发表时间：
2008-12-01
影响因子：
9.5
通讯作者：
Lee, Kwang-Pill
中科院分区：
文献类型：
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作者：
Gopalan, Anantha Iyenger;Santhosh, Padmanabhan;Lee, Kwang-Pill
以聚偏氟乙烯（PVdF）和聚丙烯腈（PAN）为原料，采用静电纺丝法制备了PAN含量分别为25%、50%和75%的PVdF-PAN-ESFM复合纤维膜。通过场发射扫描电子显微镜（FESEM）检查的ESFM的形态。FESEM图像显示PVdF-ESFM纤维直径均匀，表面光滑。然而，PVdF-PAN-ESFM的纤维与大量不同尺寸的空隙和空腔互连。这些空隙被有效地用于通过装载溶解在碳酸丙烯酯中的高氯酸锂来制备聚合物电解质。具有25%PAN的PVdF-PAN-ESFM（命名为PVdF-PAN（25）-ESFM）可以负载高量的锂盐，电解质吸收超过300%。PVdF-PAN（25）-ESFM电解质在25 ℃下表现出7.8 mS cm（-1）的高电导率，并且在高达5.1 V下电化学稳定。此外，向PVdF中添加PAN降低了与锂电极的界面电阻。PVdF-PAN-ESFM电解质具有PVdF和PAN互补的有利特性。这里报道的有希望的结果清楚地表明，基于PVdF-PAN-ESFM的聚合物电解质最适合于锂电池。(C)2008 Elsevier B. V.保留所有权利。
Electrospun fibrous membranes of composites of polyvinylidene fluoride and polyacrylonitrile (PVdF-PAN-ESFMs) are prepared with different proportions of PAN (25, 50 and 75%, w/w). The morphology of the ESFMs is examined by field emission scanning electron microscopy (FESEM). FESEM image of PVdF-ESFM reveals that the fibers have uniform diameters and smooth surfaces. However, the fibers of PVdF-PAN-ESFMs are interconnected with large number of voids and cavities of different sizes. These voids are effectively utilized for the preparation of polymer electrolytes by loading lithium perchlorate dissolved in propylene carbonate. PVdF-PAN-ESFM with 25% PAN (designated as PVdF-PAN(25)-ESFM) could load a high amount of lithium salt with electrolyte uptake of more than 300%. PVdF-PAN(25)-ESFM electrolyte exhibits a high conductivity of 7.8 mS cm(-1) at 25 degrees C and electro-chemically stable up to 5.1 V. Also, the addition of PAN into PVdF decreases the interfacial resistance with lithium electrode. PVdF-PAN-ESFM electrolytes have complementary advantageous characteristics of PVdF and PAN. The promising results reported here clearly indicate that polymer electrolytes based on PVdF-PAN-ESFMs are most suited for lithium batteries. (C) 2008 Elsevier B.V. All rights reserved.