Design of pyrite/carbon nanospheres as high-capacity cathode for lithium-ion batteries

更新时间:2023-05-28

【摘要】Transition metal sulfides are emerging as promising electrode materials for energy storage and conversion. In this work, hierarchical FeS2/C nanospheres are synthesized through a controllable solvothermal method followed by the annealing process. Spherical FeS2 core is homogeneously coated by thin carbon shell. The hierarchical nanostructure and carbon coating can enhance electron transfer and accommodate the stress originated from the volume change as well as suppress the shuttle effect of polysulfide. Consequently, as the cathode material of lithium ion batteries（LIBs）, the FeS2/C nanospheres exhibit high reversible capacity of 676 m Ahg-1 and excellent cycling life with the capacity retention of 97.1% after100 cycles. In addition, even at the high current density of 1.8 C, a reversible capacity of 437 m Ahg-1 is obtained for the FeS2/C nanospheres, demonstrating its great prospect for practical applications in highperformance LIBs.

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