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Vol. 26 No. 3 (2014): Vol 26 Issue 3

Copyright (c) 2014 AJC

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Characterization of Spinel-type LiAlxMn2-xO4 Prepared by Liquid-phase Combustion Synthesis

https://doi.org/10.14233/ajchem.2014.15491
Mimi Chen
Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650500, P.R. China2School of Chemistry and Biotechnology, Yunnan University of Nationalities, Kunming 650500, P.R. China
Xianyan Zhou
Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650500, P.R. China2School of Chemistry and Biotechnology, Yunnan University of Nationalities, Kunming 650500, P.R. China
Changwei Su
Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650500, P.R. China2School of Chemistry and Biotechnology, Yunnan University of Nationalities, Kunming 650500, P.R. China
Mingwu Xiang
Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650500, P.R. China2School of Chemistry and Biotechnology, Yunnan University of Nationalities, Kunming 650500, P.R. China
Junming Guo
Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming 650500, P.R. China2School of Chemistry and Biotechnology, Yunnan University of Nationalities, Kunming 650500, P.R. China

Corresponding Author(s) : Junming Guo

guojunming@tsinghua.org.cn

Asian Journal of Chemistry, Vol. 26 No. 3 (2014): Vol 26 Issue 3

Abstract

LiAlxMn2-xO4 with submicron-sized particles were synthesized by liquid-phase combustion synthesis method at 500 °C for 3 h. LiNO3, Li(OAc)2·2H2O, Mn(NO3)2, Mn(OAc)2·4H2O and Al(NO3)3·9H2O were used as raw materials. The X-ray diffraction pattern of products suggested they included a less impurity of Mn3O4 and a main LiMn2O4 phase with a spinel structure except that LiAl0.08Mn1.92O4 had a single phase of LiMn2O4. Cycle performance revealed that Al doping samples (x £ 0.10) possessed higher initial discharge capacity. Moreover, capacity fading could be suppressed by doped-Al. Especially, LiAl0.08Mn1.92O4 exhibited the highest value of 116.4 mAh/g and the highest retention of 82.3 % after 40 cycles. The data of cycle voltammetry and electrochemical impedance spectrum (EIS) indicated that polarization and charge transfer impedances (Rct) of LiAlxMn2-xO4 were reduced by doped-Al, suggesting better reversiblities of Li+ insertion/extraction.

Keywords

Lithium ion cathode material LiAlxMn2-xO4 Al-doped Spinel LiMn2O4 Liquid-Phase combustion synthesis
Chen, M., Zhou, X., Su, C., Xiang, M., & Guo, J. (2014). Characterization of Spinel-type LiAlxMn2-xO4 Prepared by Liquid-phase Combustion Synthesis. Asian Journal of Chemistry, 26(3), 714–718. https://doi.org/10.14233/ajchem.2014.15491
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