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Porous polyetherimide separators controlled in‐situ by tetrabutyl titanate as polymer electrolyte with ionic liquid for lithium‐oxygen batteries
Author(s) -
Liu Jiuqing,
Wang Cheng,
Li Qihou,
Li Jie,
Chen Ya,
Song Feifei,
Hong Zikun,
Liu Meng,
Bai Lishun,
Zeng Fanli
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6906
Subject(s) - electrolyte , polyetherimide , chemical engineering , separator (oil production) , materials science , thermal stability , titanate , lithium (medication) , ionic liquid , cathode , inorganic chemistry , polymer , electrode , chemistry , catalysis , composite material , organic chemistry , ceramic , medicine , physics , engineering , thermodynamics , endocrinology
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‐BF 4 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.