Thermal behavior of Li1-yNiO2 and the decomposition mechanism

被引：261

作者：

Arai, H ^{[1
]}

Okada, S ^{[1
]}

Sakurai, Y ^{[1
]}

Yamaki, J ^{[1
]}

机构：

[1] NTT, Integrated Informat & Energy Syst Labs, Tokai, Ibaraki 31911, Japan

来源：

SOLID STATE IONICS | 1998年 / 109卷 / 3-4期

关键词：

lithium battery; cathode material; lithium nickel oxide; thermal stability;

D O I：

10.1016/S0167-2738(98)00075-7

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：

We report the thermal behavior of Li1-yNiO2 up to 300 degrees C which we investigated using thermogravimetry (TG) and differential scanning calorimetry (DSC). The decomposition mechanism was studied using the X-ray diffraction data obtained for the thermally decomposed products. At about 200 degrees C Li1-yNiO2 turned into Li(1-y/(2-y))Ni1/(2-y)O which has a rock-salt structure. This was accompanied by oxygen evolution. A significant exothermic process was observed for compounds with y greater than or equal to 0.7 and this resulted in products with disordered rock-salt structures. Using these results, we propose a mechanism in which the exothermic behavior is caused by random cation mixing. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：295 / 302

页数：8

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