Effects of Zn or Ti substitution for Ni on the electrochemical properties of LiNiO2

LiNiO2 and LiNi1−yMyO2 (M=Zn and Ti, y=0.005, 0.01, 0.025, 0.05, and 0.1) were synthesized with a solid-state reaction method by calcination at 750°C for 30h under oxygen stream after preheating at 450°C for 5h in air. LiNi0.995Zn0.005O2 among the Zn-substituted samples and LiNi0.995Ti0.005O2 among...

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Bibliographic Details
Published in:Ceramics international 2011-04, Vol.37 (3), p.779-782
Main Authors: Kim, Hun Uk, Song, Jihong, Mumm, Daniel R., Song, Myoung Youp
Format: Article
Language:English
Subjects:
Calcination
Cation mixing electrochemical properties
Cations
Ceramics
Heating
I0 0 3/I1 0 4 value
LiNiO2
Nickel
R-factor
Streams
Titanium
Zinc
Zn or Ti substitution
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Summary:LiNiO2 and LiNi1−yMyO2 (M=Zn and Ti, y=0.005, 0.01, 0.025, 0.05, and 0.1) were synthesized with a solid-state reaction method by calcination at 750°C for 30h under oxygen stream after preheating at 450°C for 5h in air. LiNi0.995Zn0.005O2 among the Zn-substituted samples and LiNi0.995Ti0.005O2 among the Ti-substituted samples showed the best electrochemical properties. For similar values of y, LiNi1−yTiyO2 had in general better electrochemical properties than LiNi1−yZnyO2. Electrochemical properties seem to be closely related to R-factor but less related to I003/I104 value. In the FT-IR absorption spectra of LiNiO2 and LiNi1−yMyO2 (M=Zn and Ti, y=0.005, 0.01, 0.025, 0.05 and 0.1), Li2CO3 was detected even if it is not observed from XRD pattern, with the samples LiNi1−yZnyO2 (y=0.05 and 0.1) showing Li2ZnO2 additionally. The smaller cation mixing of the Ti-substituted samples is considered to lead to their better electrochemical properties than the Zn-substituted samples.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2010.10.021