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Figure 3: (a) SEM image and (b) structure illustration of folding graphene sheets; (c) discharge/charge profiles (1st, 2nd, 5th, and 100th cycles) of the as-prepared graphene paper at the current density of 100 mAg−1 as LIB anode; (d) cycle performance of the graphene paper as LIB anode at different current densities [23].