Nanosized high voltage cathode material LiMg0.05Ni0.45Mn1.5O4: Structural, electrochemical and in situ investigation

被引：46
作者：
Lafont, U. [1 ]
Locati, C. [1 ]
Borghols, W. J. H. [2 ]
Lasinska, A. [3 ]
Dygas, J. [3 ]
Chadwick, A. V. [4 ]
Kelder, E. M. [1 ]
机构：
[1] Delft Univ Technol, DCT, NL-2628 BL Delft, Netherlands
[2] Delft Univ Technol, R3, NL-2629 JB Delft, Netherlands
[3] Warsaw Univ Technol, Fac Phys, PL-00662 Warsaw, Poland
[4] Univ Kent, Sch Phys Sci, Funct Mat Grp, Canterbury CT2 7NR, Kent, England
来源：
JOURNAL OF POWER SOURCES | 2009年 / 189卷 / 01期
关键词：
High voltage spinel; In situ XANES; Li-ion battery; Nanomaterials; LiNi0.5Mn1.5O4; LI-ION BATTERIES; SECONDARY LITHIUM BATTERIES; ELECTRODE MATERIALS; SPINELS; 0.1-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.5; LIMG-DELTA-NI0.5-DELTA-MN1.5O4; HIGH-POWER; LINI0.5MN1.5O4; LINIXMN2-XO4; MORPHOLOGY; NI;
D O I：
10.1016/j.jpowsour.2008.09.121
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：
In this study a modified solid state synthesis (auto-ignition method) is used to form nanosized spinet type material LiMg0.05Ni0.45Mn1.5O4. This material presents a high voltage plateau at 4.75V vs. Li/Li+, Structural and electrochemical characterisations have been performed using a wide range of techniques (TEM, neutron diffraction, galvanostatic measurements, and impedance spectroscopy). Besides, in situ XAS has been performed to monitor the evolution of Ni and Mn oxidation state during Li intercalation. The material presents an ordered cubic spinet structure, good capacity retention upon cycling (131 mAh g(-1) at C/10 and 117 mAh g(-1) at 1C) and good electronic conductivity (10(-6) Scm(-1) at RT). The simultaneous presence of Mn3(+)/Mn4+ in the structure has been investigated and explained by inclusion of disordered nanodomains in the structure. (C) 2008 Elsevier B.V. All rights reserved.
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页码：179 / 184
页数：6
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