In this paper, nanostructured porous MnCO3 spheres are facilely synthesized, which can simultaneously provide an increased surface for conversion reaction and capacitive storage as anode material of lithium ion battery. This material gives superior specific capacity and excellent long-term cycling performance even at a high current density. It can deliver a stable capacity of 1049 mAh g-1 after 200 cycles at a current density of 1000 mA g-1, which is much higher than theoretical capacity of 466 mAh g−1. After 2000 cycles at high current of 5000 mA g-1, a capacity of 510 mAh g−1 can still be maintained. The high rating performance at 5000 mA g-1 is among the best-reported anode materials. From the in-situ or ex-situ SEM observation, the porous MnCO3 nanostructure can provide a stable template for reversible lithium insertion and extraction without significant morphology change and accommodate the volume change during the charge-discharge process. Also this structure increases the capacitive contribution to the total capacity compared with other MnCO3 samples.