Battery technology and research is a very tricky business. There have been many big announcements in the past but then nothing concrete emerged. That’s why also this news here is to be taken carefully.
Adding a 200-mile range in 10 min, so-called extreme fast charging (XFC), is the key to mainstream adoption of battery electric vehicles (BEVs). Here, we present an asymmetric temperature modulation (ATM) method that, on one hand, charges a Li-ion cell at an elevated temperature of 60C to eliminate Liplating and, on the other, limits the exposure time at 60C to only 10min per cycle, or 0.01% of the lifetime of a BEV, to prevent severe solid-electrolyte interphase growth. The asymmetric temperature between charge and discharge opens a new path to enhance kinetics and transport during charging while still achieving long life. We show that a 9.5-Ah 170-Wh/kg cell sustained1,700 XFC cycles (6 C charge to 80% state of charge) at 20% capacity loss with the ATM, compared to 60 cycles for a control cell, and that a 209-Wh/kg Q2BEV cell retained 91.7% capacity after 2,500 XFC cyclesAsymmetric Temperature Modulation for Extreme Fast Charging of Lithium-Ion Batteries