Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 45, Issue 11, Pages 16603-16617Publisher
WILEY
DOI: 10.1002/er.6906
Keywords
lithium‐ oxygen batteries; non‐ solvent‐ induced phase separation; polyetherimide; separators; tetrabutyl titanate
Categories
Funding
- National Key R&D Program of China [2018YFB0104200]
- Natural Science Foundation of Hunan Province [2020JJ4717]
- Special Funds for the Construction of Innovative Province of Hunan [2020GK2056]
- Fundamental Research Funds for the Central Universities of Central South University [1053320190287]
- Open-End Fund for the Valuable and Precision Instruments of Central South University [CSUZC202030]
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By improving the structure of the separator and adding electrolyte additives, the performance of lithium-oxygen batteries has been significantly enhanced, leading to longer cycle life and more stable performance.
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.
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