Recently,CoCO3 has attracted enormous attention as anodes for lithium-ion batteries (LIBs),benefiting from its high theoretical capacity and simple synthesis.However,the modest electronic conductivity and structural instability over cycling hinder its wider applications.To well address the intrinsic issues,we explored a precipitant-free hydrothermal methodology for mass production of spindle-like CoCO3/reduced graphene oxide (S-CoCO3/rGO) toward advanced LIBs as a hybrid anode.The dimethylformamide plays a significant role of “two birds (i.e.,solvent and precipitant) with one stone” in the formation of the S-CoCO3/rGrO,greatly improving its practical applicability.The purposeful introduction of rGO nanosheets as a two-dimensional flexible conductive network enhances the conductivity and stability of the S-CoCO3.It is the structural and compositional merits for LIBs that endow the S-CoCO3/rGO with remarkable lithium-storage performance in terms of enhanced interfacial storage capacity,high-rate reversible capacities (803 mAh·g-1 at 2.0 A·g-1) and long-duration capacity retention of 82.1％ over 2000 consecutive cycles at 2.0 A·g-1.More significantly,the simple yet efficient avenue here promises enormous commercial prospect of the S-CoCO3/rGO in next-generation LIBs.