From reactive cycle 600 onwards, the density and thickness of the organic SEI layer increases. Simultaneously, we see an increase in the layer stability against dissolution or disintegration into the surrounding electrolyte, owing to the strongly bound matrix created by BDC 2-and EDC 2-coordinated to linking Li + (see Supporting Information). The layer also extends further into the bulk EC solution, with the greatest extent of the SEI from the anode surface found to be ∼ 13 nm. At the same time, the Li + mass density separates with little remaining strongly bound in the inorganic layer on the anode surface, but most having been consumed within the organic layer. PF - 6 is expelled into the bulk electrolyte.