Bis(2-chloroethyl) ether-1,3-bis[3-(Dimethylamino)propyl]urea copolymer -Chitosan–Poly(acrylamide-co-diallyldimethylammonium chloride) Blends as Membranes for Alkaline Anion-Exchange Membranes

Wednesday, 4 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)
B. Ao (Donghua Unveristy), Y. N. Wei (DonghuaUniverstiy), and J. L. Qiao (Donghua University)
Solid, thin, and flexible energy storage devices are required to power flexible and wearable technologies which are rapidly growing in importance. One of the key components for solid-state energy storage is a polymer electrolyte which eliminates liquid electrolyte leakage and minimizes bulky packaging. An ideal polymer electrolyte for supercapacitors should exhibit the following properties: (a) high ionic conductivity; (b) a wide electrochemical stability window for maximum cell voltage; and (c) high environmental and temperature stability for device safety and long service life[1-3].

In this paper, the novel, low-cost alkaline anion-exchange membranes (CS/PDDA), made from Chitosan and poly(diallyldimethylammonium chloride) blends, are successfully synthesized by a combined thermal and chemical cross-linking technique. The hydroxide conductivity (OH-), water uptake, ion exchange capacity (IEC), thermal stability, oxidative stability and alkaline stability of CS/PDDA membranes are measured to evaluate their applicability in electrochemical capacitors. The effects of membrane composition on OH- conductivity are studied using AC impedance technique. It is found that by cross-linking modifications, the membranes exhibit high OH- conductivity of 0.0162S cm-1 is achieved at m (CS) : m (PDDA)=1:0.5. The CS/PDDA membranes as electrode materials for supercapacitor demonstrated a wide voltage window (1.5 V), and exhibit high specific capacitance of 27.6 mF cm-2 at 100 mV s-1.


[1] H. Gao, K. Lian, RSC Advances, 4,33091(2014) .

[2] H. Gao, J. Li, K. Lian, RSC Advances, 4,21332(2014).

[3] M. Kaempgen, C.K. Chan, J. Ma, Y. Cui, G. Gruner, Nano Letters, 9,1872(2009).