Abstract: Pitch and glucose pyrocarbons were prepared by the carbonization of petroleum pitch and glucose at 800℃ under a nitrogen flow and were used as the electrodes of sodium ion batteries.Results show that the carbon interlayer spacing,and the oxygen content of the glucose carbon are much larger than those of the pitch carbon,while the degree of crystallinity is smaller.The first discharge capacities of the glucose and pitch carbons are 171.9 and 79.2 mAh/g,and their capacity retention rates after 20 cycles are 94.6 and 68.2%,respectively.Cyclic voltammetry analysis shows that the potential of the irreversible reduction peak in the low potential range of the pitch pyrocarbon is lower than that of the glucose pyrocarbon.AC impedance analysis shows that the impedance of a solid-electrolyte interface film,the interface impedance and the diffusion resistance of the glucose pyrocarbon are significantly lower than that of the pitch pyrocarbon.