Low Resistance Anion-Exchange Membrane (AEM) for Membrane Capacitive Deionization (MCDI), CMCDILRAEM

In Membrane Capacitive Deionization (MCDI), placing ion-exchange membranes directly in front of the porous carbon electrodes (an anion-exchange membrane [AEM] at the anode and a cation-exchange membrane [CEM] at the cathode) prevents co-ion expulsion and significantly boosts charge efficiency and salt removal capacity. However, because MCDI relies on transient electrical cycling (alternating polarization and regeneration), ohmic resistance losses across the CEM represent one of the primary bottlenecks limiting energy efficiency and maximum salt adsorption rate (SAR).

To minimize voltage drop and energetic penalty during rapid charging cycles, high-performance AEMs require specific electrochemical parameters: (1) Low Area Electrical Resistance (R_Ω): Ideally < 1.0 Ω*cm2 (often approaching 0.5 - 0.8 Ω*cm2 in 0.1 M NaCl) to prevent excessive ohmic heating and voltage waste. (2) High Ion Exchange Capacity (IEC): Typically 1.2 to 2.0 mmol/g to ensure a high concentration of fixed positive charges for efficient counter-ion (Cl-) transport. (3) Optimized Thickness: Ultra-thin profiles (15-50 um) are heavily favored over traditional thick chlor-alkali membranes to drastically cut down diffusional and electrical resistance paths. (4) High Permeselectivity / Donnan Exclusion: > 95% to prevent co-ion (Na+) leakage, ensuring that charge efficiency remains near unity. (5) Moderate Water Uptake: Balanced swelling (15% - 30%) to facilitate rapid hydration-shell ion mobility without sacrificing dimensional stability or mechanical strength during repeated volume expansion/contraction of the underlying carbon electrodes.

Part Number	CMCDILRAEM (C-MCDI-LRAEM)
Working Mechanism
Membrane Thickness (Dry)	~50 um
Area Resistance	≤2.9 Ω*cm2 (0.5 M NaCl, 25°C)
Selectivity	≥96%
pH Range	1-12
Burst Intensity	≥0.25 MPa
Water Penetration Rate	≤ 0.1 mL/h*cm2*MPa
Thermal Stability	≤ 50 °C
Package Grade	L20-80cm*W20-40cm/pcs/pack

Reference: 

1. R. McNair, et al., Asymmetric Membrane Capacitive Deionization Using Anion-Exchange Membranes Based on Quaternized Polymer Blends, ACS Appl. Polym. Mater. (2020) 2 (7): 2946–2956.
2. J. Chang, et al., Application of anion exchange membrane and the effect of its properties on asymmetric membrane capacitive deionization, Separation and Purification Technology, 2018, 207, 387-395