Abstract Composites of montmorillonite (MMT) and polyaniline (PANI) were synthetized through a facile and inexpensive method. Two samples with different MMT/PANI ratios were studied and deeply characterized by XRD, TG, zeta potential, FTIR and XPS measurements. On one hand, the sample with ratio MMT/PANI = 87/13 was an intercalated composite, were polyaniline resides between the inorganic layers of the clay at a regular distance. On the other hand, the sample with ratio MMT/PANI = 12/88 was an exfoliated composite, where the inorganic sheets are immersed in an amorphous polymeric matrix. FTIR and XRD results indicated that in both samples, the emeraldine form of polyaniline was obtained. The composites were used to modify -by dr. blade technique- a commercial separator for lithium-ion batteries (LIBs) with the aim of increasing its wettability, ionic conductivity and electrochemical performance. The three-dimensional and multilayered network structure of the MMT/PANI composites led to an enhancement of the electrolyte uptake capacity (from 32% in bare Celgard to 137% and 168% for MMT/PANI_87/13 and MMT/PANI_12/88 modified separators, respectively, after 3 h). The presence of the coating membrane also led to an increase of the ionic conductivity by one order of magnitude in the modified separators respect to the unmodified one. These coated and non-coated separators were used to assemble full cells with LiNi1.5Mn0.5O4 as cathode active material. The capacity fade after 200 cycles was 20% lower in the cell with MMT/PANI_12/88 membrane in comparison with the bare separator. The enhancement of the electrochemical performance of the cells with the coated separator suggests that is a promising strategy to be used in LIBs.

中文翻译：

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蒙脱石/聚苯胺复合材料的合成与表征及其在商业隔膜改性中的应用

摘要 蒙脱石 (MMT) 和聚苯胺 (PANI) 的复合材料是通过一种简便且廉价的方法合成的。研究了具有不同 MMT/PANI 比率的两个样品，并通过 XRD、TG、zeta 电位、FTIR 和 XPS 测量进行了深入表征。一方面，比率 MMT/PANI = 87/13 的样品是一种插层复合材料，聚苯胺以规则距离存在于粘土的无机层之间。另一方面，比率 MMT/PANI = 12/88 的样品是剥离的复合材料，其中无机片材浸入无定形聚合物基质中。FTIR 和 XRD 结果表明，在两个样品中，均获得了祖母绿形式的聚苯胺。复合材料被用来修改 - 由博士。刀片技术——一种用于锂离子电池 (LIB) 的商业隔膜，旨在提高其润湿性，离子电导率和电化学性能。MMT/PANI 复合材料的三维和多层网络结构导致电解质吸收能力的提高（从裸 Celgard 的 32% 到 MMT/PANI_87/13 和 MMT/PANI_12/88 改性隔膜的 137% 和 168% ，分别在 3 小时后）。与未改性的隔膜相比，涂层膜的存在还导致改性隔膜中离子电导率增加一个数量级。这些有涂层和无涂层的隔膜用于组装以 LiNi1.5Mn0.5O4 作为正极活性材料的全电池。与裸隔膜相比，具有 MMT/PANI_12/88 膜的电池在 200 次循环后的容量衰减降低了 20%。