We have significantly improved the rate performance of the Na 2 FeP 2 O 7 @C system through the Ti-doping strategy. A series of Ti-doped composites are prepared by the solid-state method. It is found that the Ti-doped sample displays a pair of redox platforms near 2 V, which can contribute a small amount of capacity. In addition, we are surprised to find that an appropriate amount of Ti-doped sample can enhance the rate performance of the raw material. Density functional theory (DFT) calculations reveal the enhanced Na ions diffusion performance in Ti-doped Na 2 FeP 2 O 7 @C, which is consistent with experimental observations. The high current density of 40 C is investigated for the first time in the solid-state synthesis reports, corresponding to a capacity of 50 mAh g−1. This high-rate performance can maintain 1000 cycles with almost no decline, demonstrating that the Ti-doped strategy can retain the excellent structural stability of the pyrophosphates. With the titanium doping strategy, we have significantly improved the electrochemical performance of the Na 2 FeP 2 O 7 @C system, which delivers a specific capacity of 50 mAh g−1 after 1000 cycles at a high rate of 40 C and the Coulombic efficiency is close to 100%. [Display omitted] • Ti was rationally doped into Na 2 FeP 2 O 7 @C system by simple solid-state synthesis. • The introduction of Ti evidently contributed an amount of specific capacity. • The 5% Ti-doped sample had excellent rate and cycling performance at 40C. [ABSTRACT FROM AUTHOR]