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Decomposition Kinetics of Lithium Amide and Its Implications for Hydrogen Storage

Published online by Cambridge University Press:  01 February 2011

Frederick E. Pinkerton
Frederick E. Pinkerton*
Affiliation:
Materials and Processes Laboratory, MC 480–106–224, General Motors Research and Development Center, Warren, MI 48090–9055
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Abstract

Kinetics of the lithium amide (LiNH2) decomposition reaction 2 LiNH2 → Li2NH + NH3 were determined using thermogravimetric analysis (TGA). LiNH2 is a primary component of the hydrided state of Li3N- and Li2NH-based storage materials. Its decomposition by ammonia release, and the resulting degradation of hydrogen storage capacity, has important implications for the durability of Li-N-H storage systems. Fine powders of LiNH2 were prepared by ball milling for 20 min. Kinetic parameters were extracted from a set of TGA weight loss curves taken at different heating rates between 1 and 20°C/min, and the activation energy Ea was determined to be 124 kJ/mole. Although decomposition occurs slowly below 300°C, isothermal TGA measurements on Li3N demonstrate that its cumulative effect is large in real Li-N-H systems, where LiNH2-containing hydrided material is held at elevated temperature under dynamic gas flow.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 837: Symposium N – Materials for Hydrogen Storage – 2004 , 2004 , N5.3
Copyright
Copyright © Materials Research Society 2005

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References

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