▎ 摘　　要

With its high theoretical capacity and low cost, FeF2 possesses a great potential for applications in next-generation lithium-ion batteries. However, its poor conductivity and dramatic volume change during the charge/discharge process limit its practical application. To maximize available electrochemical performance, a novel porous reduced graphene oxide-FeF2@carbon (rGO-FeF2@C) composite that exhibits a high reversible capacity of 430 mA h g(-1) and maintains 400 mA h g(-1) even after 50 cycles at 0.08 A g(-1) has been successfully synthesized by a dealloying method, which also demonstrated superior rate performance from 0.08 A g(-1) to 1.00 A g(-1). The result shows that such a structure and method are an effective strategy to achieve good performance for the FeF2 cathode. A novel phenomenon that a lower charge voltage will induce a higher discharge plateau is observed and the possible assumption is raised.