Interpreting the structural and electrochemical complexity of 0.5Li2MnO3•0.5LiMO2 electrodes for lithium batteries (M = Mn0.5-xNi0.5-xCo2x, 0≤x≤0.5)

被引：285

作者：

Kang, S.-H.

Kempgens, P.

Greenbaum, S.

Kropf, A. J.

Amine, K.

Thackeray, M. M.

机构：

[1] Argonne Natl Lab, Div Chem Engn, Argonne, IL 60439 USA

[2] CNRS, UPR 4212, CRMHT, F-45071 Orleans 2, France

[3] CUNY Hunter Coll, Dept Phys, New York, NY 10021 USA

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2007年 / 17卷 / 20期

关键词：

D O I：

10.1039/b618715c

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：

The structural and electrochemical features of layered 0.5Li(2)MnO(3)center dot 0.5LiMO(2) electrodes, in which M = Mn0.5-xNi0.5-xCo2x ( 0 <= x <= 0.5), have been studied by powder X-ray diffraction, electrochemical differential-capacity measurements, Li-7 magic-angle-spinning nuclear magnetic resonance, and X-ray absorption near-edge spectroscopy. Li2MnO3-like regions in the as-prepared samples were observed for all values of x, with transition-metal cation disorder between the LiMO2 and Li2MnO3 components increasing with cobalt content (i.e., the value of x). The structural disorder and complexity of the electrochemical redox reactions increase when the Li2MnO3-like regions within the electrode are activated to 4.6 V in lithium cells; interpretations of structural and electrochemical phenomena are provided.

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页码：2069 / 2077

页数：9

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