Around cycle 300, aggregates of BDC 2- (blue) and EDC 2-(green) form, held together by networking Li + ions (purple) with a two-or three-fold coordination state. These diffuse relatively freely into the bulk electrolyte, away from the anode surface. As more dimerization reactions occur, larger aggregates form (see Supporting Information) and the coordination state of Li + increases to 4-or 5-fold. By reactive cycle 600 an organic layer starts to condense. Initially, the layer is sparsely populated and relatively close to the anode surface.