Improved electrochemical performance of LiMn2O4 cathode material by Ce doping

被引：68

作者：

Michalska, M. ^{[1
]}

Ziolkowska, D. A. ^{[2
,3
]}

Jasinski, J. B. ^{[2
]}

Lee, P. -H. ^{[4
]}

Lawniczak, P. ^{[5
]}

Andrzejewski, B. ^{[5
]}

Ostrowski, A. ^{[5
]}

Bednarski, W. ^{[5
]}

Wu, S. -H. ^{[4
]}

Lin, J. -Y. ^{[6
]}

机构：

[1] Inst Elect Mat Technol, Wolczynska 133, PL-01919 Warsaw, Poland

[2] Univ Louisville, Conn Ctr Renewable Energy Res, Louisville, KY 40292 USA

[3] Univ Warsaw, Fac Phys, Pasteura 5, PL-02093 Warsaw, Poland

[4] Tatung Univ, Dept Mat Engn, 40,3rd Sect,Zhongshan North Rd, Taipei 104, Taiwan

[5] Polish Acad Sci, Inst Mol Phys, Smoluchowskiego 17, PL-60179 Poznan, Poland

[6] Tatung Univ, Dept Chem Engn, 40,3rd Sect,Zhongshan North Rd, Taipei 104, Taiwan

来源：

ELECTROCHIMICA ACTA | 2018年 / 276卷

基金：

美国国家科学基金会;

关键词：

Lithium ion battery; Sol-gel method; Spinel; Lithium manganese oxide; Cerium; LITHIUM-ION BATTERIES; DOPED LIMN2O4; SOL-GEL; SPINEL LIMN2O4; RECHARGEABLE BATTERIES; ELECTRODE MATERIALS; MAGNETIC-PROPERTIES; LATTICE-VIBRATIONS; MANGANESE SPINEL; HIGH-POWER;

D O I：

10.1016/j.electacta.2018.04.165

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Lithium manganese oxide nanopowders doped with Ce ions are synthesized using modified sol-gel method and the effect of annealing atmosphere (air vs. nitrogen) on the structure, morphology, and phase composition is studied thoroughly. Electrochemical testing is conducted to evaluate the effect of annealing atmosphere on electrochemical performance. The X-ray diffraction indicates the cubic spinel structure for all the obtained samples. The lattice parameter is observed to slightly decrease with increasing concentration of Ce3+ ions substituting Mn3+ ions from 8.230 to 8.228 angstrom and from 8.227 to 8.224 angstrom for air annealing and for nitrogen-air annealing, respectively. A limited solubility of cerium in LiMn2O4 is also observed, as small amounts of cerium dioxide is detected on the surface of LiMn2-xCexO4 grains and confirmed by XPS analysis of cerium which shows only the spectrum of Ce4+ ions. Electrochemical testing is conducted to evaluate the effect of annealing atmosphere on electrochemical performance. It is shown that annealing in nitrogen and then in air results in excellent capacity retention with minimal, 4-8% capacity loss after 150 cycles. LiMn1.99Ce0.01O4 samples prepared that way display better high rate performance in comparison with pristine LiMn2O4. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：37 / 46

页数：10

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