| dc.description.abstract | Metal organic framework (MOFs) have been considered to be the ideal
precursor for metal oxides, metal sulfides, metal selenides or carbon materials which
can be used for anode of lithium and sodium ion batteries. In this work, use the metal
organic framework based on manganese ion, and get manganese sulfide MnS by
sulfurization, the best sulfurization temperature is 700 ℃. After finding the best
sulfurization temperatue, then synthesis manganese and zinc bimetallic metal organic
framework Mn/ZnBTC be the precursor and get the manganese and zinc sulfides
decorated with nitrogen-doped carbon by sulfurization named (Mn,Zn)S/N-C. Then
find the ratio of manganese and zinc which has the best electrochemical performance
for anode material. Finally, (Mn,Zn)S/N-C(1-1) exhibits the most great
electrochemical performance in half-cell lithium ion batteries, it shows specific
capacity of 1003 mAh/g after 100 cycles at a current density 0.1 A/g. And in half-cell
sodium ion battery, it demonstrates a specific capacitance of 266.8 mAh/g after 100
cycles at a current density of 0.05 A/g. In a full-cell configuration with lithium iron
phosphate, it exhibits a reversible capacity of 40.5 mAh/g and a coulombic efficiency
of approximately 95% after 100 cycles at 0.1 C.
The second part is based on the same ligand from the first part. Copper nitrate
and nickel nitrate are used as metal ion precursors to replace the manganese and zinc
ions and synthesize organic metal framework precursors Cu/NiBTC. After
sulfurization, copper sulfide and nickel sulfide composite materials are obtained. Then
test the relation of electrochemical performance and nickel amount. It is observed that
composites with nickel content, specific capacity of those composites can higher than
copper sulfide. Among them, Cu1.96S/Ni3S2-50 exhibits the best cyclic stability, with a
specific capacity of 385.5 mAh/g after 100 cycles at a current density 0.1 A/g. And
also exhibits the highest lithium ion diffusion coefficient. | en_US |