Porous polyetherimide separators controlled in‐situ by tetrabutyl titanate as polymer electrolyte with ionic liquid for lithium‐oxygen batteries

Abstract

Due to its advantages in specific capacity, lithium-oxygen batteries are expected to increase the recharge mileage of electric vehicles. However, the safety and cycle stability problems of lithium-oxygen batteries have not been completely resolved. Herein, through the non-solvent-induced phase separation method combined with the in-situ hydrolysis modification strategy of tetrabutyl titanate, a type of polyetherimide (PEI) separator with typical fingershaped pores and honeycomb-shaped supporting layer pore structure was prepared. After being infiltrated by EMIM-BF 4 ionic liquid electrolyte, the ionic conductivity of the separator can reach 0.75 mS cm À1 . Due to the low crystallinity, high thermal stability, and stable ion transport pore structure of the separators, the assembled lithium-oxygen batteries can stably cycle for more than 75 cycles under the condition of a limit of 1000 mAh g À1 . In addition, under the strategy of high-performance cathode catalysts and electrolyte additives, the application of the porous PEI separators in lithium-oxygen batteries will be further expanded.

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

“…Preparation of the P/ PEI separator: Polyethylene polyamine (PEPA)/methanol solution with a concentration of 30 g L −1 and TMC/n-hexane solution of 0.8 g L −1 were prepared. The porous PEI separator prepared based on the previous work 36 was first soaked into a PEPA/methanol solution for a moment and dried to obtain a cross-linked aminated PEI separator; then, the cross-linked separator was immersed in TMC/n-hexane solution for 60 s. Subsequently, the treated separator was placed in an oven at 65 °C for 300 s to enhance the acylation reaction. Then, the separator was fully soaked with deionized water for a whole day and dried to obtain a polyamide/PEI cross-linked separator, which was named P/PEI.…”

Mathematical modelling and design of the ionic liquid compressor for the hydrogen refuelling station

“…Ionic liquids are formed by an organic cation and an organic or inorganic anion presenting as molten salts, many of which are liquid at room temperature. 16 They possess several excellent properties including negligibly low vapor pressures, 17 electrochemical stability, chemical stability, 18 thermal stability, high ionic conductivity, 19 low flammability, 20 and excellent lubricity, 21 which promotes the application of them in various energy fields such as fuel cells, 22 solar cells, 23 batteries, 24 and energy storage. 25 As the most promising compression solution, in the ionic liquid compressor, the solid piston of the reciprocating compressor is substituted by the ionic liquid piston and driven by the hydraulic system.…”