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a) Scheme for pushing‐up growth mechanism of the reacted Li layer at the LMA. Initially developed reacted Li/SEI layer remains at the top whereas the newly formed SEI and reacted Li are formed beneath the preformed layer. b) Proposed XPS analysis to reveal the SEI chemistry after cycling. Particularly in a lean electrolyte, surface analysis of the native LMA surface can inform compositional changes of the electrolyte and the chemical evolution of the reacted Li layer over cycling.
