▎ 摘　　要

Transition-metal carbonates have recently been investigated as anode materials for lithium-ion batteries because of their relatively high capacity compared with that of the corresponding transition-metal oxides. In this work, a facile stirring solvothermal reaction is used to prepare a CoCO3/graphene composite without the use of an additional organic chelating agent. The as-prepared CoCO3/graphene composite exhibits a smaller cubic particle size of 1-2 pm and a larger specific surface area than the composite obtained by a traditional solvothermal reaction. The composite prepared with stirring delivers a highly reversible capacity of 602 mAh g(-1) after 100 cycles. Even at a high current density of 2.0 A g(-1), the composite maintains charge discharge capacities of 605/598 mAh g(-1). The composites contained the same amount of graphene, indicating that the improved electro-chemical properties are attained independently of the amount of the graphene. In addition, the results of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS)experiments also reveal that the CoCO3/graphene composite electrode materials synthesised via a stirring solvothermal reaction exhibit substantially enhanced kinetics. The stirring solvo/hydrothermal reaction develops in this work is considered a promising candidate for efficiently preparing carbonate/graphene composites with better electrochemical properties for practical applications, without the use of an extra chelating agent.