The United States DOE has identified extreme fast charging (XFC, i.e., recharge in 10 min or less at a charging rate of 6C and above) as a critical challenge that must be overcome in order to achieve widespread adoption of EVs. INL, as one of partners in the DOE-sponsored eXtreme Fast Charge Cell Evaluation (XCEL) program, identifies the bottlenecks of applying such high rates to batteries and the relavent implications to performance, life, and safety. Understanding of the aging implications of XFC is crucial to optimize material, electrode, and cell designs and operating conditions to achieve XFC targets. The XCEL program has six major research thrusts—namely, cathode, charging protocol, anode design, heterogeneity, heat generation and Li-plating detection. INL researchers lead the cathode and charging protocol thrusts and provide key support to anode design, heat generation, electrolyte thrust, and heterogeneity thrust. Noteably, the INL's Advanced Electrolyte Model (AEM) has been instrumental in deriving formulations for new electrolytes for XFC applications. With these new formulations, AEM provides genomic-level property sets that cover ionic transport, thermodynamics, ion solvation kinetics, surface charge effects, electrolyte permeation, and other metrics. The latest publications on enabling XCEL can be found below.
INL research provides key understanding on the bottlenecks of extreme fast charging (charge in 10 to 15 min at >6C and above) and identifying ways to enable XFC.
Research Contact: Tanvir Tanim - Phone: (208) 526-5713 - Tanvir.Tanim@inl.gov
Eric Dufek - Phone: (208) 526-2132 - Eric.Dufek@inl.gov