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

From Black Liquor to Green Energy Resource: Positive Electrode Materials for Li–O2 Battery with High Capacity and Long Cycle Life

“…EIS measurements (Figure c) were recorded for the 1st and 70th cycle of the Li||LSAC-O 2 cell with frequency from 0.1 to 100 000 Hz. The real axis intercept at the high frequency region corresponded to the electrolyte resistance, and the terminal of the semicircle revealed interfacial resistance . After the charge process, interfacial resistance decreased slightly, suggesting the decomposition of discharge products, while the increase of the imaginary axis might be attributed to the loss of organic solvent.…”

Interfacial Polymerization-Modified Polyetherimide (PEI) Separator for Li–O2 Battery with Boosted Performance

“…As matters stand, to achieve the widespread application of Li−O 2 batteries, it is significant to develop an advanced separator to improve the cycle life and safety of Li− O 2 batteries. In the pioneering works, Luo et al 14 prepared a thermally conductive separator by coating boron nitride (BN) on the surface of separator and Woo et al 15 reported a doublelayer separator composed of polymer separator and glass fiber (GF) separator; with these kinds of efforts, improved stability of electrolyte/electrode interface and excellent cycle life were achieved. However, the separators obtained by the aforementioned methods were largely thickened, which is detrimental to ion-transport effectiveness and further enhancing battery performance.…”

Significant Reduction in Interface Resistance and Super-Enhanced Performance of Lithium-Metal Battery by In Situ Construction of Poly(vinylidene fluoride)-Based Solid-State Membrane with Dual Ceramic Fillers

“…Previously, the use of different organic polymer matrices, such as polyacrylonitrile (PAN), poly­(methylmethacrylate) (PMMA), poly­(ethylene oxide) (PEO), and poly­(vinylidene fluoride) (PVDF), and different electrolytes has been explored in the modification of solid-state electrolytes. − Among them, mainly PEO employed with lithium salts and fillers was extensively utilized due to its quality to reduce the crystallization behavior attributable to the interaction alignment of its ether oxygen with cations in polymer chains. − Because of the low thermal stability, low ionic conductivity at room temperature, and high viscosity, PEO restricts the properties of lithium batteries, which cannot meet the standards of practical applications. − In comparison, PVDF is not only considered as a superior matrix with improved ionic conductivity resulting from its electron-absorbing dominant functional group as (−C–F), but also shows sufficient mechanical integrity in the development of the free-standing membranes. − PVDF has been widely used with inorganic fillers to improve the electrochemical performance for energy storage devices and is compatible with mechanical properties. − Recently, PVDF layers provide sufficient space for accommodating ether-based electrolytes and facilitate Li + transport from a solid-state-based electrolyte membrane. − …”