Polyvinylpyrrolidone‐Mediated In Situ Synthesis of Well‐Connected Ni3V2O8/C Nanocomposite Anode for Lithium‐Ion Batteries

A Ni3V2O8/C nanocomposite (nano‐NVO/C) is prepared using a facile solvothermal and postcalcination method, in which polyvinylpyrrolidone (PVP) is adopted as the carbon source and simultaneously prevents the aggregation of Ni3V2O8 nanoparticles to enable in situ formation of highly dispersed Ni3V2O8 nanoparticles around amorphous C. Microstructural characterization shows that elastic amorphous C serves as filler to fill the voids within Ni3V2O8 nanoparticles, bridging the Ni3V2O8 nanoparticles, improving electron transport ability, and withstanding the crystal stress coming from Li+ insertion/extraction. As a consequence, the electrochemical performances including discharge capacity, cycling stability, and rate capacity of nano‐NVO/C are greatly enhanced, delivering a superior cycling capacity of 1284 mA h g−1 at a current density of 0.3 A g−1 after 300 cycles. Electrochemical kinetics studies show that the charge storage in nano‐NVO/C is controlled by the pseudocapacitive mechanism. A Ni3V2O8/C nanocomposite (nano‐NVO/C) is prepared using a solvothermal and postcalcination method, in which polyvinylpyrrolidone (PVP) is adopted as the carbon source and prevents the aggregation of nano‐NVO to enable in situ formation of highly dispersed nano‐NVO around amorphous C. Nano‐NVO/C is used as an anode material for lithium batteries, showing excellent electrochemical performance.