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Nonlinear thermal expansion in Li2NiMn3O8

Published online by Cambridge University Press:  29 February 2012

Lingmin Zeng,
Yeqing Chen,
Wei He and
Liangqin Nong
Lingmin Zeng*
Affiliation:
Key Laboratory of Nonferrous Metal Materials and New Processing Technology, Ministry of Education, Guangxi University, Nanning, Guangxi 530004, China
Yeqing Chen
Affiliation:
Key Laboratory of Nonferrous Metal Materials and New Processing Technology, Ministry of Education, Guangxi University, Nanning, Guangxi 530004, China
Wei He
Affiliation:
Key Laboratory of Nonferrous Metal Materials and New Processing Technology, Ministry of Education, Guangxi University, Nanning, Guangxi 530004, China
Liangqin Nong
Affiliation:
Key Laboratory of Nonferrous Metal Materials and New Processing Technology, Ministry of Education, Guangxi University, Nanning, Guangxi 530004, China
*
a)Author to whom correspondence should be addressed. Electronic mail: lmzeng@gxu.edu.cn
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Abstract

A lattice thermal expansion study on Li2NiMn3O8, a high-voltage cathode material for lithium-ion batteries, was carried out by high-temperature X-ray diffraction from room temperature to 973 K. Rietveld refinement of a high-quality room-temperature diffraction pattern confirmed that Li2NiMn3O8 has the cubic Al2MgO4 spinel type of crystal structure. The analysis of the high-temperature X-ray diffraction patterns showed that the Li2NiMn3O8 structure remained stable and no phase transition was detected over the temperature range from 298 to 973 K. As expected, the value of lattice parameter a or unit cell volume V increases with increasing temperature. The increase in a or V is linear only in the low-temperature region and nonlinear over the entire temperature range from 298 to 973 K. Least-squares analysis of the data for a or V showed the thermal expansion of a or V for Li2NiMn3O8 can best be fitted by a 3-degree polynomial function of temperature. The linear thermal expansion coefficients for a and V averaged over the entire temperature range from 298 to 973 K were also calculated, and αTa=1.10×10−5 K−1; αTV=3.29×10−5 K−1.

Keywords

Li2NiMn3O8thermal expansionX-ray diffraction

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Type
TECHNICAL ARTICLES
Information
Powder Diffraction , Volume 23 , Issue 3 , September 2008, pp. 224 - 227
Copyright
Copyright © Cambridge University Press 2008

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References

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