A New Polyoxometalate (POM)-Based Composite: Fabrication through POM-Assisted Polymerization of Dopamine and Properties as Anode Materials for High-Performance Lithium-Ion Batteries

摘要

Organic substrates are indispensable in the fabrication of multifunctional polyoxometalate (POM)-based composites for various applications. A new molybdovanadophosphoric heteropolyacid (PMo_(10)V_2)-based polydopamine (PDA) composite (PMo_(10)V_2/PDA) is first synthesized through a facile, in situ polymerization method under hydrothermal conditions, without the addition of extra buffer solution. The obtained PMo_(10)V_2/PDA composite shows homogeneous microsphere morphology. Through utilization of the adhesive ability of PDA, the composite can be used as an anode material without additional binder for rechargeable lithium-ion batteries. Excellent electrochemical performances are obtained, with a high, stable specific capacity of 915.3 mAhg~(-1) at a current density of 100 mAg~(-1), remarkable rate capability, and good cycling stability (≈93% capacity retention after 300 cycles at a high current density of 1000 mAg~(-1)).