Changes in the structure and physical properties of Li1-yNi0.5Mn0.4Ti0.1O2 (y=0 and 0.5)

被引：7

作者：

Kobayashi, H

Arachi, Y

Kageyama, H

Sakaebe, H

Tatsumi, K

Mori, D

Kanno, R

Kamiyama, T

机构：

[1] Natl Inst Adv Ind Sci & Technol, AIST, Special Div Green Life Technol, Ikeda, Osaka 5638577, Japan

[2] Kansai Univ, Fac Engn, Unit Chem, Suita, Osaka 5648680, Japan

[3] Tokyo Inst Technol, Interdisciplinary Grad Sch Sci & Engn, Dept Elect Chem, Midori Ku, Yokohama, Kanagawa 2268502, Japan

[4] KEK, High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

来源：

SOLID STATE IONICS | 2004年 / 175卷 / 1-4期

关键词：

layered oxides; lithium manganese oxide; XAFS measurement; SQUID measurement;

D O I：

10.1016/j.ssi.2003.12.027

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Li1-yNi0.5Mn0.4Ti0.1O2 (y=0 and 0.5) was synthesized and characterized using X-ray diffraction, XAFS, and SQUID measurements. The samples were single-phase and adopted the alpha-NaFeO2 structure. Li1-yNi0.5Mn0.4Ti0.1O2 (y=0 and 0.5) can be represented as Li(Ni0.52+Mn0.44+Ti0.14+)O-2 and Li-0.5(Ni0.53+Mn0.44+Ti0.14+)O-2, respectively. Structural analysis demonstrated that the lattice parameter a decreased from 2.895 to 2.856 Angstrom, the lattice parameter a increased from 14.317 to 14.509 Angstrom, and the Ni-O bond length decreased from 2.06 to 1.94 Angstrom with de-lithiation. The low occupation of Ni on the 3a site was confirmed from the ferromagnetic behavior caused by the 180degrees Ni2+(3a)-O-Mn4+(3b)-O-NI2+ (3a) superexchange interaction. These results indicated that lithium de-intercalation from LiNi0.5Mn0.4Ti0.1O2 was controlled mainly by changing the valence state of Ni from 2+ to 3+. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：221 / 224

页数：4

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