Synthesis of Organodiphosphonate MOFs-derived Ni₂P/C Composite

Ni and organodiphosphonate-based metal organic framework(Ni-MOF) was synthesized under hydrothermal condition using p-xylylenediphosphonate as the organic ligand. Then, Ni-MOF was selected to prepare the amorphous carbon coated Ni₂P composite materials by facile method. The composite material retained the lamellate shape of the precursor, and the BET surface area reached 202 m²/g. The Ni₂P nanoparticles in the composites had good crystallinity, and the particles were homogeneous and had no reunion. In the performance of lithium ion battery, the Ni₂P/C composite structure improved the electron and ion conductivity of the material while reducing the volume expansion of the material, thus improving the electrochemical properties of the material. The first charge and discharge capacity of Ni₂P/C composite material were 247 and 226 mA·h·g^-1, respectively, coulombic efficiency can reach 91.7%, and the coulombic efficiency reaches 100% after 200 cycles.