PDF《SUPPORTING INFORMATION》

9 bare Co3ZnC nanoparticles, respectively. The EDX spectrum together with the EDX elemental maps suggest the co-existence of C, Co, and Zn elements, and further demonstrate the homogeneous distribution of these elements. Fig. S7. XRD spectrum of bare Co3ZnC nanoparticles.

10 Fig. S8. TGA analysis of bare Co3ZnC nanoparticles under air atmosphere with a heating rate of

10 °C/min.

11 Fig. S9. (a) N2 adsorption/desorption isotherm and (b) pore size distribution curve of bare Co3ZnC nanoparticles.

12 Fig. S10. CV curves of pitaya-like microsphere anode within the potential range of 0.01C3.0 V vs. Li/Li+ at a scan rate of 0.2 mV/s.

13 Fig. S11. CV curves of bare Co3ZnC nanoparticle electrode within the potential range of 0.01C3.0 V vs. Li/Li+ at a scan rate of 0.2 mV/s.

14 Fig. S12. Ex-situ XRD spectra of pitaya-like microspheres at different charge and discharge states.

15 Fig. S13. Charge/discharge profiles of bare Co3ZnC nanoparticle anode at

100 mA g-1.

16 Fig. S14. Rate capability of pitaya-like microsphere electrode with different cells under various current densities.

17 Fig. S15. Rate performance of bare Co3ZnC nanoparticles at various current densities (100C1000 mA g-1).

18 Fig. S16. (a,b) FESEM and (c,d) TEM images of bare carbon frameworks prepared by completely removing the Co3ZnC nanoparticles in pitaya-like microspheres through the etching of HF (5 wt.%) and HCl (1.0 M) successively. The insert of (b) shows the corresponding EDX spectrum, indicating no Co or Zn element is remained in the bare carbon frameworks.

19 Fig. S17. (a) N2 adsorption-desorption isotherm and (b) pore size distribution curve of bare carbon frameworks.

20 Fig. S18. Cycling performances of bare carbon frameworks before (a) and after (b) thermal annealing at

1000 °C for

6 h.

21 Fig. S19. (a,b) FESEM image of pitaya-like microsphere anode after

1150 cycles at

1000 mA g-1. (c,d) FESEM images of bare Co3ZnC nanoparticles after

100 cycles at

100 mA g-1. The FESEM observations demonstrate that the pitaya-like microspheres can maintain excellent structural integrity without any obvious morphology change after very long-term stability tests at relatively high rate, while bare Co3ZnC nanoparticles show structural instability and rapid capacity decay after cycling.

22 Fig. S20. XPS spectrum of pitaya-like microspheres.

23 Fig. S21. XPS spectra of bare carbon frameworks (a) before and (b) after thermal annealing at

1000 °C for

6 h.