Carbon Nanotubes Rooted in Porous Ternary Metal Sulfide@N/S-Doped Carbon Dodecahedron: Bimetal-Organic-Frameworks Derivation and Electrochemical Application for High-Capacity and Long-Life Lithium-Ion Batteries

摘要

Lithium ion battery is the predominant power source for portable electronic devices, electrical vehicles, and back-up electricity storage units for clean and renewable energies. High-capacity and long-life electrode materials are essential for the next-generation Li-ion battery with high energy density. Here bimetal-organic-frameworks synthesis of Co0.4Zn0.19S@N and S codoped carbon dodecahedron is shown with rooted carbon nanotubes (Co-Zn-S@N-S-C-CNT) for high-performance Li-ion battery application. Benefiting from the synergetic effect of two metal sulfide species for Li-storage at different voltages, mesoporous dodecahedron structure, N and S codoped carbon overlayer and deep-rooted CNTs network, the product exhibits a larger-than-theoretical reversible Li-storage capacity of 941 mAh g(-1) after 250 cycles at 100 mA g(-1) and excellent high-rate capability (734, 591, 505 mAh g(-1) after 500 cycles at large current densities of 1, 2, and 5 A g(-1), respectively).