Role of Exposure Atmospheres on Particle Coarsening and Phase Transformation of LiAlO 2

Heo, Su Jeong; Hu, Boxun; Uddin, Md Aman; Aphale, Ashish; Hilmi, Abdelkader; Yuh, Chao-Yi; Surendranath, Arun; Singh, Prabhakar

doi:10.1149/2.0181708jes

Title: Role of Exposure Atmospheres on Particle Coarsening and Phase Transformation of LiAlO ₂

Journal Article · Fri May 05 00:00:00 EDT 2017 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0181708jes· OSTI ID:1425155

Heo, Su Jeong ^[1]; Hu, Boxun ^[1]; Uddin, Md Aman ^[1]; Aphale, Ashish ^[1]; Hilmi, Abdelkader ^[2]; Yuh, Chao-Yi ^[2]; Surendranath, Arun ^[2]; Singh, Prabhakar ^[1]

Univ. of Connecticut, Storrs, CT (United States). Center for Clean Energy Engineering and Dept. of Materials Science and Engineering
FuelCell Energy, Inc., Danbury, CT (United States)

The phase transformation and particle coarsening of lithium aluminate (α-LiAlO₂) in electrolyte are the major causes of degradation affecting the performance and the lifetime of the molten carbonate fuel cell (MCFC). The stability of LiAlO₂ has been studied in Li₂CO₃-Na₂CO₃ electrolyte under accelerated conditions in reducing and oxidizing gas atmospheres at temperatures of 650 and 750 for up to 500 hours. X-ray diffraction analyses show that the progressive transformation of α-LiAlO₂to γ-LiAlO₂ phase proceeds with increasing temperature in lower P_CO2 and lower P_O2 environments. Spherical LiAlO₂ particles were transformed to coarsened pyramid-shape particles in 4% H₂-3% H₂O-N₂ and 100% N₂ (~10 ppm P_O2 ) atmospheres. Under CO₂-rich atmospheres (4% H₂-30% CO₂-N₂ and 70% air-30% CO₂), both phase and particle size remained unchanged at 650 and 750ºC. The selected area electron diffraction (SAED) pattern analysis indicated that the large pyramidal shape particles (~30 μm) were γ-LiAlO₂ phase. Experimental observations and related simulation results pertaining to particle coarsening and phase transformation behavior of LiAlO₂are presented.

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Research Organization:: FuelCell Energy, Danbury, CT (United States); Univ. of Connecticut, Storrs, CT (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0006606

OSTI ID:: 1425155

Journal Information:: Journal of the Electrochemical Society, Vol. 164, Issue 8; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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