Researchers from Oak Ridge National Laboratory (ORNL) and colleagues have developed a novel high-performance electrolyte (HPE) consisting of lithium bis(fluorosulfonyl)imide (LiFSI), lithium hexafluorophosphate (LiPF6) and carbonates to support extreme fast charging (XFC). A paper on their work appears in the journal Batteries & Supercaps.
Realizing XFC in lithium-ion batteries for electric vehicles is still challenging due to the insufficient lithium-ion transport kinetics, especially in the electrolyte, the researchers note.
They tested the new electrolyte in pilot-scale, 2-Ah pouch cells and found that the HPE-based pouch cells deliver improved discharge specific capacity and excellent long-term cyclability up to 1500 cycles under XFC conditions—superior to the conventional state-of-the-art baseline electrolyte. The cell recharged 80% of its capacity in 10 minutes.
Du et al.
We found this new electrolyte formulation basically triples the Department of Energy’s target for the lifespan of an extreme-fast-charging battery.—Zhijia Du, corresponding author
Du, Z., Yang, Z., Tao, R., Shipitsyn, V., Wu, X., Robertson, D. C., Livingston, K. M., Hagler, S., Kwon, J., Ma, L., Bloom, I. D., Ingram, B. J., (2023) “A Novel High-Performance Electrolyte for Extreme Fast Charging in Pilot Scale Lithium-Ion Pouch Cells” Batteries & Supercaps doi: 10.1002/batt.202300292