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Updated: May 25, 2025
Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
Published on: July 12, 2016
Synergy of O2 Permeance and H2O Resistance by PIM-Enhanced PDMS Composite Membranes for "Closed-Type" Aprotic Li-Air
Tong Huang1,2, Fayun Wu1, Shuang Liu1
1State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China.
Abstract:
Aprotic Li-O2 batteries exhibit ultra-high energy density through the redox reaction of O2. However, their open-structure design makes them prone to water infiltration and electrolyte leakage. Traditionally, dense and thick oxygen-permeable membranes (OPMs) are employed to prevent H2O intrusion, but this approach limits O2 permeance and constrains charge current densities. To address the trade-off between O2 permeance and H2O resistance, a novel double-laminated film (DLF) is proposed as an OPM. This innovative design integrates a thin polydimethylsiloxane (PDMS) layer, known for its excellent H2O resistance, onto a polymer of intrinsic microporosity (PIM-1) substrate, which offers high O2 permeability. The resulting thin composite OPM (<40 µm) enables Li-air batteries to operate continuously for 90 cycles (180 h) in ambient air with a relative humidity of 50 ± 5% at 1000 mA g⁻¹, owing to the synergistic effects of the OPM's exceptional O₂ permeance (6881 Barrer, 215 GPU) and its effective mitigation of H₂O intrusion. The selective transport of O2 and H2O is facilitated by the hydrophobic apertures of the PDMS and PIM-1 layers, which exploit their kinetic differences. This work highlights the potential of high-free-volume, microporous polymers, and DLF architectures for advancing OPMs in aprotic Li-air battery applications.
