Electrochemical properties of nanocrystalline LiCu xMn 2-xO 4 (x = 0.2-0.6) particles prepared by ultrasonic spray pyrolysis method
2012 (English)In: Materials Chemistry and Physics, ISSN 0254-0584, Vol. 136, no 2-3, 424-430 p.Article in journal (Refereed) Published
The nanocrystalline LiCu xMn 2-xO 4 (x = 0.2-0.6) particles were prepared by ultrasonic spray pyrolysis method using lithium nitrate, manganese nitrate and copper nitrate salts at 800 °C in air atmosphere. Particle properties were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy. Besides, voltammetric and galvanostatic tests were performed to investigate the effects of the copper substituted on electrochemical behavior. Particle characterization studies showed that low copper substituted nanocrystalline particles had single spinel structure, and increasing amount caused tendency of second spinel phase formation. Particles, ranging between 250 nm and 1.5 μm size, were formed by aggregation of nanoparticles. The cumulative discharge capacities of LiCu 0.2Mn 1.8O 4 were determined as 122, 105 and 87 mAh g -1 at 0.5, 1 and 2 C rates, respectively between 4.8 and 3 V potential range. The capacity fade is 44% of initial capacity after 50 cycles at 0.5C rate. Results showed that electrochemical properties of LiCu xMn 2-xO 4 (x = 0.2-0.6) particles were impaired by increasing Cu substitute due to the second phase formation and ionic displacement in the lattice.
Place, publisher, year, edition, pages
2012. Vol. 136, no 2-3, 424-430 p.
Chemical synthesis, Crystal structure, Electrochemical properties, Electron microscopy, Nanostructures
IdentifiersURN: urn:nbn:se:kth:diva-105433DOI: 10.1016/j.matchemphys.2012.07.003ISI: 000311865400022ScopusID: 2-s2.0-84867396800OAI: oai:DiVA.org:kth-105433DiVA: diva2:571271
QC 201211222012-11-222012-11-212013-01-08Bibliographically approved