Abstract
Twist-shaped CuO nanowires were synthesized by two-step method consisting of solution reaction and then heat treatment. The as-synthesized samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). When evaluated as anode materials for lithium ion batteries, twist-shaped CuO nanowires showed a high initial discharge capacity of 983 mAh g−1and maintained a reversible capacity of 320 mAh g−1over 50 cycles at the current density of 100 mA g−1. Thus, 1D twist-shaped CuO nanowires provide a new insight into the development of anode materials for next-generation high performance lithium ion batteries.
Highlights
Rechargeable lithium ion batteries have been considered as the most promising energy storage device for portable electronic devices and electrical vehicles due to their high electromotive force and high energy density [1,2,3,4]
The working electrodes were prepared by mixing the active material (CuO nanowires), acetylene black, and polyvinylidene fluoride (PVDF) with a weight ratio of 80 : 10 : 10 in 1-methyl-2pyrrolidinone (NMP) to form homogeneous slurry and the slurries were uniformly coated on the copper foil and dried at 100∘C under vacuum for 12 hours; the total mass loading of the electrode is about 3 mg
In order to investigate the performance of twist-shaped CuO nanowires, electrochemical characterization was conducted based on 2032 coin-type cells with pure lithium sheet as the counter electrode
Summary
Rechargeable lithium ion batteries have been considered as the most promising energy storage device for portable electronic devices and electrical vehicles due to their high electromotive force and high energy density [1,2,3,4]. As one of the transition metal oxides, CuO has attracted extensive attention because of its natural abundance, low cost, and ecofriendliness [11, 12], and it has a high theoretical capacity of 674 mAh g−1, which is almost two times that of graphite. 1D nanowires have shown great potential application in lithium ion batteries due to their large specific surface area and the porous nanostructures. It can provide short diffusion path lengths for lithium ion transport to improve the electrical conductivity and relieve the volume expansion [20, 21]. Different The asprepared CuO nanowires exhibited enhanced lithium storage capacity and good cyclic performance as anode materials for lithium ion batteries
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