In situ XRD study of Li deintercalation from two different types of LiMn2O4 spinel

被引：42

作者：

Levi, E ^{[1
]}

Levi, MD

Salitra, G

Aurbach, D

Oesten, R

Heider, U

Heider, L

机构：

[1] Bar Ban Univ, Dept Chem, IL-52900 Ramat Gan, Israel

[2] Merck KGaA, D-64290 Darmstadt, Germany

来源：

SOLID STATE IONICS | 1999年 / 126卷 / 1-2期

关键词：

lithium intercalation; spinel; x-ray diffraction;

D O I：

10.1016/S0167-2738(99)00219-2

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：

A mechanism of the capacity loss in LiMn2O4 was studied by comparison of two types of spinel with different morphologies and specific surface areas (2.9 and 0.8 m(2) g(-1)). The combination of SSCV and in situ XRD techniques shows that the irreversible structural conversion occurs partially in spinel of the low specific surface area during the first Li deintercalation at a potential 4.0 V. This conversion is mainly responsible for the capacity loss in this type of spinel. It seems that these peculiarities of the electrochemical behavior are related to the presence of the layered component in this material. In contrast, spinel of the high specific surface area presents an example of a stable material without considerable variation of its capacity and XRD patterns after long-term cycling. This type of spinel demonstrates two distinct phase transitions in the vicinity of 4.0-4.1 V, corresponding to two SSCV peaks. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：109 / 119

页数：11

共 17 条

[1]

AMATUCCI GG, 1997, P JOINT INT EL SOC P

[2] Synthesis of layered LiMnO2 as an electrode for rechargeable lithium batteries [J].