A dual membrane composed of composite polymer membrane and glass fiber membrane for rechargeable lithium-oxygen batteries

Development of the lithium ion-conducting membrane with high ionic conductivity and good interfacial stability is a major challenge for lithium-oxygen batteries with high energy density. Herein, we design the dual membrane composed of Li+ ion-conducting ceramic-based composite polymer membrane and glass fiber membrane. The optimized membrane exhibited a high ionic conductivity of 8.1 × 10−4 S cm−1 at ambient temperature and retained an electrolyte solution well in the membrane. The dual membrane also effectively suppressed the lithium dendrite growth and blocked superoxide anion radical attack toward polymer in the composite polymer membrane. The lithium-oxygen cell employing dual membrane exhibited improved cycle life (> 70 cycles) at a constant current density of 0.1 mA cm−2, which was much better than the cell with either a composite polymer membrane alone or a glass fiber membrane alone.