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We present ac oral-like FePc omposite with FeP nanoparticles anchored and dispersed on anitrogen-doped 3D carbon framework (FeP@NC). Due to the highly continuous N-doped carbon framework and as pring-buffering graphitized carbon layer around the FePnanoparticle,asodium-ion battery with the FeP@NC composite exhibits an ultra-stable cycling performance at 10 Ag À1 with ac apacity retention of 82.0 %i n1 0000 cycles.A lso,p article refinement leads to ac apacity increase during cycling. The FePn anoparticles go through arefining-recombinationprocess during the first cycle and present aglobal refining trend after dozens of cycles,which results in ag radually increase in graphitization degree and interface magnetization, and further provides more active sites for Na + storage and contributes to ar ising capacity with cycling. The capacity ascending phenomenon can also extend to lithium-ion batteries.