Doughnut-structured FeS2@C nanorings: Towards the efficient synthesis and application in high-performance Li-ion cathode
Abstract
Lithium-FeS2 battery has the prospect of sustainable and low cost application. Nevertheless, the realization of high capacity and cyclic stability is still a huge challenge. To solve the problems of FeS2 as a cathode material, such as the unstable structure and poor electronic conductivity, the eco-friendliness doughnut-structured FeS2@C nanorings have been successfully synthesized in this work. When used as a cathode material for lithium-ion batteries (LIBs) (1-3 V), the doughnut-structured FeS2@C nanorings can maintain the discharge capacity of 688.11 mAh g-1 after 100 cycles at the current density of 200 mA g-1, showing excellent cyclic stability and capacity retention. More importantly, even under the high current density of 2 A g-1, they still maintain average specific discharge capacity of 380.36 mAh g-1 after 500 cycles, showing a long cycle life. Furthermore, they have fairly excellent discharge energy density at the material level (∼1040.21Wh/kg-FeS2) after 100 cycles at a current density of 0.2 A g-1. All the results show that our prepared doughnut-structured FeS2@C nanorings cathode materials have a great application potential in LIBs.
