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Schematics of the overall conversion and agglomeration process. Upon initial lithiation of SnO2, a thin amorphous shell was initially formed, with the nucleation of Sn NPs, some of which move along the surface to be attached to other Sn NPs. As lithiation proceeds, more Sn NPs are formed and they subsequently undergo coalescence to be merged into larger Sn NPs, which are positioned in the amorphous matrix.
