Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 22    No. 7    July 2012

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First-principles study of intrinsic defects, dopants and dopant-defect complexes in LiBH4
ZHANG Guo-ying1, LIU Gui-li2, ZHANG Hui1

1. College of Physics Science and Technology, Shenyang Normal University, Shenyang 110034, China;
2. College of Constructional Engineering, Shenyang University of Technology, Shenyang 110023, China

Abstract:A first-principles study was reported based on density functional theory of hydrogen vacancy, metal dopants, metal dopant-vacancy complex in LiBH4, a promising material for hydrogen storage. The formation of H vacancy and metal doping in LiBH4 is difficult, and their concentrations are low. The presence of one kind of defect is helpful to the formation of other kind of defect. Based on the analysis of electronic structure, the improvement of the dehydrogenating kinetics of LiBH4 by metal catalysts is due to the weaker bonding of B-H and the new metal-like system, which makes H atom diffuse easily; H vacancy accounts for a trace amount of BH3 release during the decomposing process of LiBH4; metal dopant weakens the strength of B-H bonds, which reduces the dehydriding temperature of LiBH4. The roles of metal and vacancy in the metal dopant-vacancy complex can be added in LiBH4 system.

 

Key words: LiBH4; hydrogen storage material; first-principles calculation; defect; H diffusion; dehydrogenating properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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