Effects of Al doping on the microstructure of LiCoO2 cathode materials

被引：231

作者：

Myung, ST

Kumagai, N ^{[1
]}

Komaba, S

Chung, HT

机构：

[1] Iwate Univ, Fac Engn, Dept Appl Chem & Mol Sci, Morioka, Iwate 0208551, Japan

[2] Dongshin Univ, Fac Engn, Dept Ceram Engn, Naju 520714, Chonnam, South Korea

来源：

SOLID STATE IONICS | 2001年 / 139卷 / 1-2期

关键词：

LiCo1-xAlxO2; powders; emulsion drying method; chemical diffusion coefficient; cobalt dissolution; variation in c-axis;

D O I：

10.1016/S0167-2738(00)00828-6

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：

LiCo1-xAlxO2(0 less than or equal to x less than or equal to 0.3, R (3) over barm) powders by the emulsion drying method and their microstructure studies were carried out in order to understand Al-doping effect on the electrochemical properties. Through X-ray diffraction experiment; we confirmed that Co was well substituted by Al while maintaining the alpha -NaFeO2 layer structure type. The substitution of Al was effective on suppressing cobalt dissolution at 4.5 V versus Li/Li+ and on diminishing changes in a- and c-axes during lithium intercalation. For x = 0.1, the open-circuit voltage was slightly higher than that of undoped LiCoO2. Chemical diffusion coefficient of lithium in LiCo1-xAl2O3 was higher than that of LiCoO2 because of a smaller variation in the longer c-axis. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：47 / 56

页数：10

共 25 条

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