Porous polyetherimide separators controlled in‐situ by tetrabutyl titanate as polymer electrolyte with ionic liquid for lithium‐oxygen batteries. (27th May 2021)

• Record Type: Journal Article
• Authors: Liu, Jiuqing; Wang, Cheng; Li, Qihou; Li, Jie; Chen, Ya; Song, Feifei; Hong, Zikun; Liu, Meng; Bai, Lishun; Zeng, Fanli
• Is Part Of: International journal of energy research. Volume 45:Number 11(2021)
• Page Start: 16603
• Page End: 16617
• Publication Date: 2021-05-27
• Subjects: lithium‐oxygen batteries -- non‐solvent‐induced phase separation -- polyetherimide -- separators -- tetrabutyl titanate; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.6906
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: 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 finger‐shaped pores and honeycomb‐shaped supporting layer pore structure was prepared. After being infiltrated by EMIM‐BF4 ionic liquid electrolyte, the ionic conductivity of the separator can reach 0.75 mS cm −1 . 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 −1 . 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. Abstract : A type of polyetherimide (PEI) separator with typical finger‐shaped pores and honeycomb‐shaped supporting layer pore structure was firstly prepared for lithium‐oxygen battery in this work. The prepared PEI‐based polymer separator with high porosity, high thermal stability, and chemical stability was combined with an imidazole‐based ionic liquid to form a semi‐solid polymer electrolyte. This can significantly improve the cycle stability and safety of the lithium‐oxygen battery and has certain practical value.