Unveiling the (de-)lithiation mechanism of nano-sized LiMn 2 O 4 allows the design of a cycling protocol for achieving long-term cycling stability

Operando XAS and XRD of nano-sized LiMn 2 O 4 shed light on the (de-)lithiation and Jahn–Teller distortion mechanisms. The finding helps to design a cycling protocol, with periodic deep discharge to 2 V, leading to superior cycling performance at 4.3 V.