Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5350347 | Applied Surface Science | 2014 | 9 Pages |
Abstract
A simple and efficient approach was developed to synthesize CuO nanoparticles with improved electrochemical performance. Potassium (K+)-doped CuO nanoparticles were synthesized by a simple and cost-effective solvothermal method followed by annealing at 500 °C for 5 h under air atmosphere. For comparison, an undoped CuO sample was also synthesized under the same conditions. X-ray diffraction analysis demonstrates that the K+ ion doping caused no change in the phase structure, and highly crystalline KxCu1âxO1âδ (x = 0.10) powder without any impurity was obtained. As an anode material for a lithium ion battery, the K+-doped CuO nanoparticle electrode exhibited better capacity retention with a reversible capacity of over 354.6 mA h gâ1 for up to 30 cycles at 0.1 C, as well as a high charge capacity of 162.3 mA h gâ1 at a high current rate of 3.2 C, in comparison to an undoped CuO electrode (275.9 mA h gâ1 at 0.1 C and 68.9 mA h gâ1 at 3.2 C). The high rate capability and better cycleability of the doped electrode can be attributed to the influence of the K+ ion nanostructure on the increased electronic conductivity, diffusion efficiency, and kinetic properties of CuO during the lithiation and delithiation process.
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Authors
Trang Vu Thi, Alok Kumar Rai, Jihyeon Gim, Jaekook Kim,