Publication Type:

Journal Article

Source:

J. Mater. Chem. A, The Royal Society of Chemistry, Volume 2, p.6966-6975 (2014)

URL:

http://dx.doi.org/10.1039/C4TA00532E

Abstract:

K-doped Co3O4 was prepared by a solvothermal method in polyol medium{,} followed by annealing at a low temperature of 400 [degree]C for 5 h. The obtained samples were characterized by the synchrotron X-ray diffraction pattern{,} field-emission scanning electron microscopy{,} energy-dispersive X-ray spectroscopy{,} field-emission transmission electron microscopy and high-resolution transmission electron microscopy. Synchrotron XRD analysis demonstrates that the K+ ion doping caused no change in the phase structure{,} and a highly crystalline KxCo3-xO4-[small delta] (x = 0.08) powder without any impurity was obtained. When applied as the anode material{,} the K+-doped Co3O4 electrode exhibits a much better rate capability and cycling stability{,} and could retain a charge capacity of 351.3 mA h g-1 at 3 C{,} while undoped Co3O4 exhibits only 144.3 mA h g-1 at the same rate. In addition{,} the electrochemical impedance spectroscopy also reveals that the K+-doped Co3O4 electrode has the highest electronic conductivity compared to an undoped sample. However{,} the improvement in the doped sample is due to the influence of K+ ions on the increased electronic conductivity{,} diffusion efficiency{,} and kinetic properties of Co3O4 during the lithiation and delithiation process. This material shows promising potential for use in high-rate anodes for lithium-ion batteries.

Cite this Research Publication

L. Tuan Anh, Rai, A. Kumar, Thi, T. Vu, Gim, J., Kim, S., Mathew, V., and Kim, J., “Enhanced electrochemical performance of novel K-doped Co 3 O 4 as the anode material for secondary lithium-ion batteries”, J. Mater. Chem. A, vol. 2, pp. 6966-6975, 2014.