2023-09-12 オークリッジ国立研究所(ORNL)
◆この新しい電解質は、高速充電時にもイオンの流れを改善し、バッテリーが過熱しても優れた性能を発揮します。この成果は、極端な高速充電バッテリーの寿命を大幅に向上させ、持続可能なEVの普及に寄与する可能性があります。
＜関連情報＞
- https://www.ornl.gov/news/charging-ahead-new-electrolyte-goes-extra-mile-faster-ev-charging
- https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/batt.202300292
パイロットスケールリチウムイオンパウチセルにおける超高速充電のための新しい高性能電解質 A Novel High-Performance Electrolyte for Extreme Fast Charging in Pilot Scale Lithium-Ion Pouch Cells
Zhijia Du, Zhenzhen Yang, Runming Tao, Vadim Shipitsyn, Xianyang Wu, David C. Robertson, Kelsey M. Livingston, Shae Hagler, James Kwon, Lin Ma, D. Bloom, Brian J. Ingram
Batteries & Supercaps Published: 13 August 2023
DOI:https://doi.org/10.1002/batt.202300292
Graphical Abstract
Fast charging! A newly developed electrolyte has shown remarkable fast charging performance and has been validated in 2-Ah pouch cells. The cell shows 80 % capacity retention after 1500 extreme fast charging (10-minute) cycles.
Abstract
Realizing extreme fast charging (XFC) in lithium-ion batteries for electric vehicles is still challenging due to the insufficient lithium-ion transport kinetics, especially in the electrolyte. Herein, a novel high-performance electrolyte (HPE) consisting of lithium bis(fluorosulfonyl)imide (LiFSI), lithium hexafluorophosphate (LiPF6) and carbonates is proposed and tested in pilot-scale, 2-Ah pouch cells. Moreover, the origin of improved electrochemical performance is comprehensively studied via various characterizations, suggesting that the proposed HPE exhibits high ionic conductivity and excellent electrochemical stability at high charging rate of 6-C. Therefore, the HPE-based pouch cells deliver improved discharge specific capacity and excellent long-term cyclability up to 1500 cycles under XFC conditions, which is superior to the conventional state-of-the-art baseline electrolyte.
