Synthesis and Structure Evolution of LiNi1-xAlxO2(x=0—0.6)

Abstract

Abstract: LiNi_1-xAl_xO₂ is one of new cathode materials for lithium batteries, which was a solid solution of LiNiO^-2 and α-LiAlO₂. However, it is difficult to synthesize the solid solution with a high aluminum solid solubility because it is easy to decompose due to its negative synthesis enthalpy. A new synthesis method was obtained by studying the preparation conditions of LiNiO^-2 and α-LiAlO₂, then LiNi_1-xAl_xO₂(x=0—0.6) was synthesized successfully. The samples of LiNi_1-xAl_xO₂(x=0—0.6)were studied by XRD and XPS, the results show that all samples have a single α-NaFeO₂ structure and LiNi_1-xAl_xO₂ solid solutions were synthesized. With the increasing of aluminum solid solubility x, not only Ni(Al)_O binding energy increased, but also lattice constant decreased and the ratio of c/a increased. As a result, the bedded structure was more obvious and the stability was enhanced.

Key words: LiNi-{1-x}Al-xO^-2, α-NaFeO₂ structure, Solid solution, Binding energy

CLC Number:

O641

TrendMD:

LIU Wei, GONG Jie, YANG Jing-Hai, ZONG Zhan-Guo, CHEN Gang . Synthesis and Structure Evolution of LiNi_1-xAl_xO₂(x=0—0.6)[J]. Chem. J. Chinese Universities, 2005, 26(8): 1484.

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Synthesis and Structure Evolution of LiNi_1-xAl_xO₂(x=0—0.6)

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