Synthesis And Modification Of NiO As Anode Materials For Lithium Ion Batteries

Along with the broad applications of lithium ion batteries, anode materials for lithium ion battery are researched abundantly. NiO has been paid much attention due to its attractive advantages such as high theoretic capacity, nontoxicity and low material cost. The main content of the present research is to explore new synthesis methods and improve the cycling performance of NiO as an anode material for lithium ion batteries.NiO films with different morphologies were prepared by electrodeposition, including dence film, nanorod-like film and net-like porous film. The morphology is determined by the current density. With the decrease of the current density, the specific surface area as well as the cycling performance of the film increase. The specific capacity of the porous film deposited at 0.1 mA cm-2 retains 49.5% of that in the 2nd cycle, higher than that of the dence film deposited at 1 mA cm-2 (23.1%).Nickel foam-supported porous NiO/Ni films were prepared by chemical bath deposition and electrodeposition. The Ni plating can enhance the conductivity and the stability of the structure. This porous NiO/Ni film exhibits excellent cycling performance, its reversible capacity sustains 506 mAh g-1 after 50 cycles at 2 C, which retains 90.4% of that in the 2nd cycle.Sandwich-like Ni(OH)2 and NiO films are synthesized by a simple ammonia-evaporation method on nickel foam. A plausible formation mechanism is proposed based on the observations of scanning electron microscopy and transmission electron microscopy. The reversible capacity of the sandwich-like NiO film sustains 400 mAh g-1 after 50 cycles at 2 C, which retains 78% of that in the 2nd cycle. The high rate capability and reversibility of this NiO film can be attributed to its unique sandwich-like architecture.NiO and NiO/Ag hybrid nanofibers were prepared by electrospinning. The nanofibers are composited by little NiO and Ag nanoparticles. NiO and NiO/CNT were prepared by deposition-hydrothermal method, in which the NiO nanoplates attachs to the CNT. These nanocomposites not only have high surface area, but also have enhanced conductivity. They are promising electrode material for Li ion battery.