Thermal Behavior of the Layered Oxide Li2/3Co2/3Mn1/3O2 Obtained by Ion Exchange from the P2-Type Na2/3Co2/3Mn1/3O2 Phase

被引：16
作者：
Komaba, S. [1 ]
Croguennec, L. [1 ]
Tournadre, F. [1 ]
Willmann, P. [2 ]
Delmas, C. [1 ]
机构：
[1] Univ Bordeaux, CNRS, ICMCB, F-33608 Pessac, France
[2] Ctr Natl Etud Spatiales, F-31401 Toulouse 4, France
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 07期
关键词：
CATHODE MATERIAL; T(NUMBER)2-LI2/3CO2/3MN1/3O2 SYSTEM; O2; STRUCTURE; LITHIUM; LICOO2; MN; LI;
D O I：
10.1021/jp310417q
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：
Thermal evolution of the layered oxide Li2/3Co2/3Mn1/3O2, showing a T(#)2 stacking and prepared by a Na/Li ion exchange in P2-Na2/3Co2/3Mn1/3O2, was investigated by thermal analyses and X-ray diffraction. A thermal expansion of the T(#)2 orthorhombic unit cell is observed from 25 to 350 degrees C; from 350 degrees C the T(#)2 stacking is destabilized to the benefit of an O6-type stacicing obtained from the former through slab gliding. The T(#)2 to O6 phase transformation is allowed to occur from a stacicing with larger interlayer distances and the lithium ions in tetrahedral sites to a stacking with smaller interlayer distances and the lithium ions in octahedral sites. This phase transition from T(#)2, to O6 is reversible, even though its kinetic can be very slow: the thermal treatment of the T(#)2-type Li2/3Co2/3Mn1/3O2 phase at 450 degrees C with a quenching in air has shown to stabilize the O6(HT)-Li2/3Co2/3Mn1/3O2 phase. At temperatures higher than 450 degrees C, the layered oxide Li2/3Co2/3Mn1/3O2 is gradually decomposed into Li2MnO3 and Co3O4. First electrochemical tests performed in lithium batteries have revealed that O6(HT)-Li2/3Co2/3Mn1/3O2 delivers as positive electrode material a high reversible capacity of similar to 230 mAh.g(-1) over two voltage domains around 3 and 4 V vs Li+/Li
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页码：3264 / 3271
页数：8
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