Fe₃O₄ nanosphere@microporous organic networks: Enhanced anode performances in lithium ion batteries through carbonization

Very thin microporous organic networks were formed on the surface of Fe₃O₄ nanospheres by Sonogashira coupling of tetra(4-ethynylphenyl)methane and 1,4-diiodobenzene. The thickness was controlled by screening the number of building blocks. Through carbonization, Fe₃O₄@C composites were prepared. The Fe₃O₄@C composites with 4�6 nm carbon thickness showed promising reversible discharge capacities of up to 807 mA h g-1 and enhanced electrochemical stability.