Structural complexity of layered-spinel composite electrodes for Li-ion batteries

被引：35

作者：

Cabana, Jordi ^{[2
]}

Johnson, Christopher S. ^{[3
]}

Yang, Xiao-Qing ^{[4
]}

Chung, Kyung-Yoon ^{[4
,5
]}

Yoon, Won-Sub ^{[1
]}

Kang, Sun-Ho ^{[3
]}

Thackeray, Michael M. ^{[3
]}

Grey, Clare P. ^{[2
]}

机构：

[1] Kookmin Univ, Sch Adv Mat Engn, Seoul 136702, South Korea

[2] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA

[3] Argonne Natl Lab, Dept Electrochem Energy Storage, Chem Sci & Engn Div, Argonne, IL 60439 USA

[4] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA

[5] Korea Inst Sci & Technol, Adv Battery Ctr, Seoul 136791, South Korea

来源：

JOURNAL OF MATERIALS RESEARCH | 2010年 / 25卷 / 08期

关键词：

LITHIUM-MANGANESE OXIDE; X-RAY-DIFFRACTION; CATHODE MATERIALS; IN-SITU; STRUCTURE REFINEMENT; POSITIVE-ELECTRODE; NMR; LI2MNO3; MAS; DIOXIDE;

D O I：

10.1557/JMR.2010.0206

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The complexity of layered-spinel yLi(2)MnO(3)center dot(1-y)Li+xMn2-xO4 (Li:Mn = 1.2:1; 0 <= x <= 0.33; y >= 0.45) composites synthesized at different temperatures has been investigated by a combination of x-ray diffraction (XRD), x-ray absorption spectroscopy (XAS), and nuclear magnetic resonance (NMR). While the layered component does not change substantially between samples, an evolution of the spinet component from a high to a low lithium excess phase has been traced with temperature by comparing with data for pure Li1+xMn2-xO4. The changes that occur to the structure of the spinel component and to the average oxidation state of the manganese ions within the composite structure as lithium is electrochemically removed in a battery have been monitored using these techniques, in some cases in situ. Our Li-6 NMR results constitute the first direct observation of lithium removal from Li2MnO3 and the formation of LiMnO2 upon lithium reinsertion.

引用

页码：1601 / 1616

页数：16

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