Long cycle life of CoMn2O4 lithium ion battery anodes with high crystallinity

Bijelić, Mirjana and Liu, Xiang and Sun, Q. and Đurišić, Aleksandra B. and Xie, Mao Hai and Ng, Alan M. C. and Suchomski, Christian and Đerđ, Igor and Skoko, Željko and Popović, Jasminka (2015) Long cycle life of CoMn2O4 lithium ion battery anodes with high crystallinity. Journal of Materials Chemistry A, 3 (28). pp. 14759-14767. ISSN 2050-7488

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CoMn2O4 nanomaterials are prepared by a low temperature precipitation route employing metal acetates and NaOH. Structural changes, induced by different annealing temperatures, are comprehensively analyzed by X-ray powder diffraction and Raman spectroscopy. With rising annealing temperature the crystal lattice of CoMn2O4 undergoes changes; AO4 tetrahedra expand due to thermally induced substitution of Co2+ by larger Mn2+ metal ions on the A-site of the spinel structure, while in contrast, BO6 octahedra shrink since the B-site becomes partially occupied by smaller Co3+ metal ions on account of the migrated Mn ions. CoMn2O4 particle sizes are easily fine-tuned by applying different annealing temperatures; the particle size increases with increasing annealing temperature. During the battery operation, pulverization and reduction of particle sizes occurs regardless of the initial size of the particles, but the degree of division of the particles during the operation is dependent on the initial particle properties. Thus, contrary to the common assumption that nanostructuring of the anode material improves the battery performance, samples with the largest particle sizes exhibit excellent performance with a capacity retention of 104 after 1000 cycles (compared to the 2nd cycle).

Item Type: Article
Keywords: CoMn2O4, spinel, anode
Date: 25 January 2015
Subjects: NATURAL SCIENCES > Physics
Additional Information: © The Royal Society of Chemistry 2015. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Received 15 May 2015, Accepted 05 Jun 2015, First published online 25 Jun 2015.
Divisions: Faculty of Science > Department of Physics
Publisher: The Royal Society of Chemistry
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 12 Mar 2017 14:12
Last Modified: 12 Mar 2017 14:12
URI: http://digre.pmf.unizg.hr/id/eprint/5444

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