The Bacteria Absorption-based Yolk-Shell Ni3P-Carbon @ Reduced Graphene Oxides for Lithium-Ion Batteries

摘要

Traditional carbon layer enwrapping active materials cannot easily realize perfect cladding.Therefore,it still cannot prevent the pulverization of active materials during the course of charging/discharging.In this paper,we utilize natural bacteria to absorb nickel acetate,the active materials Ni3P nanoparticles are well enwrapped,as a natural organisms surviving for billions of years,their cell walls have a perfect carbon structure,and the cell walls become carbon layer through high annealing temperature.Based on this,the yolk-shell Ni3P–carbon@reduced graphene oxides paper is prepared,through a proper annealing temperature,the Ni3P particles disperse in the inner surface or both ends,so the active materials were prevented from dissolving into the electrolyte,so it may keep from invalidity during charging/discharging.The electrochemical performances display that it has stable and high capacities as Li-ion batteries(LIBs)anode.Its capacity can keep 200 cycles without any decrease,and especially its rate performance exhibits an excellent peculiarity,with the current density increasing from 400 to 1000 mA g^(−1) every 200 mA g^(−1),its capacities decrease only 9.8%,2.9%and 6.4%,and its can recover the same capacity when the current density comes back to 200 mA g^(−1).It may be a fine choice for LIBs.