Cyclic deterioration and its improvement for Li-rich layered cathode material Li[Ni0.17Li0.2Co0.07Mn0.56]O2

被引：254

作者：

Ito, Atsushi ^{[1
]}

Li, Decheng ^{[2
]}

Sato, Yuichi ^{[2
]}

Arao, Masazumi ^{[3
]}

Watanabe, Manabu ^{[1
]}

Hatano, Masaharu ^{[1
]}

Horie, Hideaki ^{[1
,4
]}

Ohsawa, Yasuhiko ^{[1
]}

机构：

[1] Nissan Motor Co Ltd, Nissan Res Ctr, Kanagawa 2378523, Japan

[2] Kanagawa Univ, Dept Mat & Life Chem, Fac Engn, Kanagawa Ku, Yokohama, Kanagawa 2218686, Japan

[3] NISSAN ARC LTD, Ctr Mat Anal, Res Dept, Yokosuka, Kanagawa 2370061, Japan

[4] Univ Tokyo, Ctr Engn, Chiba 2778568, Japan

来源：

JOURNAL OF POWER SOURCES | 2010年 / 195卷 / 02期

关键词：

Li-ion battery; Cathode material; Li[Ni0.17Li0.2Co0.07Mn0.56]O-2; Pre-cycling treatment; Cyclic deterioration; TEM; X-RAY; ION; ELECTRODES;

D O I：

10.1016/j.jpowsour.2009.07.052

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：

Transmission electron microscopy (TEM) studies were carried out to elucidate cyclic deterioration phenomena for Li-rich layered cathode material Li[Ni0.17Li0.2Co0.07Mn0.56]O-2. The results obtained show that the deterioration starts during the initial charge/discharge to higher potential over 4.5 V, and leads to the formation of micro-cracks at the crystal surface and the distortion of crystal periodicity. These two kinds of defects lead to further non-crystallization of the crystal surface and the emergence of a very small amount of another possible phase. Our stepwise pre-cycling treatment effectively depressed the formation of the former two kinds of defects, and could significantly improve cyclic durability. The observation of non-crystallization at the cathode crystal surface, which would diminish the battery performance, is consistent with our preliminary ac impedance results. (C) 2009 Elsevier B. V. All rights reserved.

引用

页码：567 / 573

页数：7

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