Rational design of Co embedded N,S-codoped carbon nanoplates as anode materials for high performance lithium-ion...

The construction of specific structures and heteroatom-doped nanomaterials is essential for enhancing the electrochemical performance of lithium-ion batteries (LIBs). Herein, three structures of cobalt nanoparticle embedded N,S-codoped carbon (CNSCo-x) nanocomposites are obtained by pyrolysis of different amounts of thioacetamide (TAA) sulfuretted zeolitic imidazolate frameworks (ZIF-67) under an Ar/H2 atmosphere. With the addition of 0.5 mmol of TAA, CNSCo-0.5 with an orderly and porous nanoplate structure is obtained. The CNSCo-0.5 exhibits the best rate behavior and cycling stability with an initial discharge capacity of 1355 mA h g-1 at 200 mA g-1, and high discharge capacities of 1360.4 mA h g-1 at the 200th cycle at 200 mA g-1, and 647.9 mA h·g-1 at the 400th cycle at 1000 mA g-1. This facile synthetic strategy could be extended to other MOFs and is significant for developing new materials for LIBs.