Electrochemical double-layer capacitors (EDLCs) have been widely studied due to their high-power densities, despite their low energy densities compared with those of lithium ion batteries. In particular, there have been numerous studies aiming to developing high surface area carbonic material to increase EDLCs’ capacitance. However, there have been few studies examining water-based polymeric binder as an inactive component of the EDLCs’ electrodes. In this study, we introduce a conductive water-based binder which is synthesized by an in situ two-step polymerization, and use it for EDLC electrodes. Polypyrrole (PPy) is used as an electrically conducting filler for a water-based polyacrylate binder to enhance the electrochemical performance of EDLCs. Consequently, the use of the new poly(pyrrole/acrylonitrile-co-butyl acrylate) (PPyANBA) increases the specific capacitance of the EDLC electrode up to 109.7 F g⁻¹ from the 101.0 F g⁻¹ value of the nonconductive PANBA-containing EDLC electrode at 10,000 cycles. This is mainly attributed to the better dispersion and lower electrical resistance of the PPyANBA binder without losing the thermal, ion transport, and binding characteristics of the PANBA.

Graphical abstract

尽管电化学双层电容器（EDLC）与锂离子电池相比具有较低的能量密度，但由于其高功率密度，因此已被广泛研究。特别地，已经有许多研究旨在开发高表面积的碳材料以增加EDLC的电容。然而，很少有研究将水性聚合物粘合剂作为EDLC电极的惰性成分。在这项研究中，我们介绍了一种通过原位两步聚合反应合成的导电水性粘合剂，并将其用于EDLC电极。聚吡咯（PPy）用作水基聚丙烯酸酯粘合剂的导电填料，以增强EDLC的电化学性能。因此，使用新的聚（吡咯/丙烯腈共丙烯酸丁酯（PPyANBA）在10,000次循环时将EDLC电极的比电容从不导电的含PANBA的EDLC电极的101.0 F g ^-1值增加到109.7 F g ^-1。这主要归因于PPyANBA粘合剂具有更好的分散性和较低的电阻，而又不会失去PANBA的热，离子迁移和粘合特性。

图形概要