Submicron LiFe1-yMnyPO4 solid solutions prepared by mechanochemically assisted carbothermal reduction: The structure and properties

被引：39
作者：
Kosova, N. V. [1 ]
Devyatkina, E. T. [1 ]
Slobodyuk, A. B. [2 ]
Petrov, S. A. [1 ]
机构：
[1] Russian Acad Sci, Inst Solid State Chem, Siberian Branch, Novosibirsk 630128, Russia
[2] Russian Acad Sci, Inst Chem, Far E Branch, Vladivostok 690022, Russia
来源：
ELECTROCHIMICA ACTA | 2012年 / 59卷
关键词：
LiFe1-yMnyPO4; Submicron materials; Mechanical activation; NMR; Magnetic measurements; ELECTRODE MATERIALS; CATHODE MATERIAL; LITHIUM; LI-X(MNYFE1-Y)PO4; DIFFRACTION; LIFEPO4; TEMPERATURE; LI-7; NMR;
D O I：
10.1016/j.electacta.2011.10.082
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Homogeneous submicron carbon-coated LiFe1-yMnyPO4 solid solutions in the whole concentration range (0 <= y <= 1) were obtained by mechanochemically assisted carbothermal reduction of Fe2O3 and MnO2, using high-energy planetary mill. The samples were studied through a combination of several techniques: XRD, TEM, FTIR, Mossbauer, Li-6,Li-7 and P-31 NMR spectroscopy and magnetic measurements. NMR study and magnetic measurements revealed the presence of tiny amounts of structural defects and ferromagnetic-like impurities with a Curie temperature above RT differing upon the sample composition. Electrochemical cycling of as prepared LiFe1-yMnyPO4 showed that, despite high homogeneity and fine particles, noticeable capacity loss is observed with increased Mn content, mainly in the Mn2+/Mn3+ range. (C) 2011 Elsevier Ltd. All rights reserved.
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收藏
页码：404 / 411
页数：8
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