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Electrochemical properties of nanocrystalline LiCu xMn 2-xO 4 (x = 0.2-0.6) particles prepared by ultrasonic spray pyrolysis method
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Tillämpad elektrokemi.ORCID-id: 0000-0001-9203-9313
2012 (engelsk)Inngår i: Materials Chemistry and Physics, ISSN 0254-0584, E-ISSN 1879-3312, Vol. 136, nr 2-3, s. 424-430Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2012. Vol. 136, nr 2-3, s. 424-430
Emneord [en]
Chemical synthesis, Crystal structure, Electrochemical properties, Electron microscopy, Nanostructures
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Identifikatorer
URN: urn:nbn:se:kth:diva-105433DOI: 10.1016/j.matchemphys.2012.07.003ISI: 000311865400022Scopus ID: 2-s2.0-84867396800OAI: oai:DiVA.org:kth-105433DiVA, id: diva2:571271
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Tilgjengelig fra: 2012-11-22 Laget: 2012-11-21 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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