Influence of lattice parameter differences on the electrochemical performance of the 5 V spinel LiMn1.5-yNi0.5-zMy+zO4 (M = Li, Mg, Fe, Co, and Zn)

被引：95

作者：

Arunkumar, TA ^{[1
]}

Manthiram, A ^{[1
]}

机构：

[1] Univ Texas, Mat Sci & Engn Program, Austin, TX 78712 USA

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2005年 / 8卷 / 08期

关键词：

D O I：

10.1149/1.1945369

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Cation substituted spinel LiMn1.5-yNi0.5-zMy+zO4 cathodes exhibit superior capacity retention and rate capability in the 5 V region compared to the unsubstituted LiMn1.5Ni0.5O4 cathode. For example, LiMn1.42Ni0.42Fe0.16O4, LiMn1.42Ni0.42Co0.16O4, and LiMn1.5Ni0.42Zn0.08O4 exhibit capacity fades of < 3% in 50 cycles with 115-125 mAh/g at C/5 rate compared to 8% fade and 131 mAh/g for LiMn1.5Ni0.5O4. Also, LiMn1.42Ni0.42Co0.16O4 retains 92% of its capacity on going from C/10 to the 4C rate compared to 82% for LiMn1.5Ni0.5O4. The superior performances of these cathodes are attributed to the smaller lattice parameter differences among the three cubic phases formed during the charge-discharge process. (c) 2005 The Electrochemical Society.

引用

页码：A403 / A405

页数：3

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