Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Synthesis of Ti-doped $Li_3AIH_6$ powders by mechanochemical reaction and their thermal decomposition behavior

기계화학반응법을 이용한 Ti-doped $Li_3AIH_6$ 분말의 합성과 열분해 특성

  • Lee, E.K. (School of Materials Science and Engineering, Seoul National University) ;
  • Kim, Y.K. (NanoMaterials Research Center, Korea Institute of Science and Technology) ;
  • Cho, Y.W. (NanoMaterials Research Center, Korea Institute of Science and Technology) ;
  • Yoon, J.K. (School of Materials Science and Engineering, Seoul National University)
  • 이응규 (서울대학교 재료공학부) ;
  • 김영관 (한국과학기술연구원 나노재료연구센터) ;
  • 조영환 (한국과학기술연구원 나노재료연구센터) ;
  • 윤종규 (서울대학교 재료공학부)
  • Published : 2005.03.15
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Abstract

[ $Li_3AlH_6$ ] (5.6wt% theoretical hydrogen storage capacity) powders with and without Ti-containing dopants have been successfully synthesized by mechanochemical reaction near room temperatures from mixtures of LiH and $LiAlH_4$ powders. It has been observed that single phase $Li_3AlH_6$ could be obtained within 2-3 hours of milling, but the addition of reactive $TiCl_2\;or\;TiCl_3$ to the starting mixtures. caused partial decomposition of $LiAlH_4$ into LiCl and free Al with gaseous $H_2$. By addition of these reactive dopants to the as-synthesized $Li_3AlH_6$, this problem could be solved. The addition of 2 mol% $TiCl_2\;or\;TiCl_3\;to\;Li_3AlH_6$ decreased the decomposition start temperature up to 30-50$^{\circ}C$, while that of Ti or $TiH_2$ did not change the thermal decomposition behavior of $Li_3AIH_6$.

Keywords

References

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