2NMO phases during charging and discharging. They also studied the initial distribution of L 2NMO at clean LPO/LNMO interfaces fabricated in a vacuum, as well as the effect of electrode thickness. Strikingly, the clean interface facilitated the intercalation and deintercalation of Li during charging and discharging of the SSLBs. As a result, the capacity of SSLBs with a clean interface was twice that of conventional LNMO-based batteries. Moreover, this study marked the first time stable reversible reactions were found between the L NMO and L 2NMO phases in SSLBs. Assistant Professor Hideyuki Kawasoko of Tohoku University and lead author of the study remarked, “Our findings indicate that the formation of a contamination-free, clean LPO/LNMO interface is key to increasing the capacity of SSLBs while ensuring low interface resistance for fast charging.”