Low temperature and hydrogen atmosphere synthesis of crystalline LiBH₄and amorphous Li₂B₁₂H₁₂mixture for hydrogen storage

Abstract

SUMMARY The works described a study on the preparation of LiBH4 thin films by means of pulsed laser deposition. The results indicated that crystalline LiBH4 films can be prepared from a LiB target under 70 Pa hydrogen atmosphere at ambient temperature. Compared with the former reports of LiBH4, the hydrogen atmosphere and temperature were effectively reduced for the synthetical crystalline LiBH4 films with amorphous Li2B12H12. The mixture was successively dehydrided by two steps in dehydriding reaction, corresponding to the dehydriding amount of approximately 8 and 6 mass%. Compared with the former reports of LiBH4 powder with no catalyzer, the primary dehydriding temperatures of the films was reduced. It will be easy to obtain the hydrogen from LiBH4. This opens up new possibilities to study this important hydrogen storage material. Copyright © 2013 John Wiley & Sons, Ltd.

Hydrogen absorption/desorption properties of light metal hydroxide systems

“…Hence, total hydrogen desorption reaction of LiH + Mg(OH) 2 system is the summation formula of reaction (14) and (3), that is, reaction (5). Weight loss from TG (5.2%) was consistent with the theoretical value of 5.39% in reaction (5). This reaction formula corresponds to the reported one.…”

“…The characterization of absorption/desorption products and the kinetics enhancement by additive has been the subject matter of investigations. [3][4][5] A representative example of M-N-H systems is lithium-nitrogen-hydrogen (Li-N-H) system. Li-N-H system has been reported a lot so far 6,7 ; however, this system has high value of enthalpy change and desorbs hydrogen at high temperature of around 300 C. By contrast, Li-Mg-N-H system has some merits of having low value of enthalpy change and lower temperature of around 180 C for hydrogen absorption/ desorption.…”

“…For instance, metal borohydrides have high gravimetric and volumetric densities of H 2 . The characterization of absorption/desorption products and the kinetics enhancement by additive has been the subject matter of investigations . A representative example of M‐N‐H systems is lithium‐nitrogen‐hydrogen (Li‐N‐H) system.…”

Very fast H2production from the methanolysis of NaBH4by metal-free poly(ethylene imine) microgel catalysts

“…However, the production and storage of H 2 are still major obstacles for its application and commercialization including in fuel cell uses . Recently, various metal borohydrides such as sodium borohydride (NaBH 4 ) , lithium borohydride (LiBH 4 ) , ammonia borane (NH 3 BH 3 ) , and sodium aluminum hydride (AlB 3 H 12 ) have been commonly used as source materials for H 2 production. Among these chemical hydrides, NaBH 4 is assumed to be the hydride most commonly used as an H 2 source because of its easy hydrolysis reaction (Eq. )…”

Ionic conductivity of melt-frozen LiBH4 films

“…The peak at 192.6 eV is attributed to LiB 4 O 7 which probably represents the oxidation product formed during the transport of the sample to the XPS. The effect this oxidation layer has on hydrogen desorption was previously reported, 12,15,16 however its effect on the ionic conductivity in battery applications has not yet been considered. XRD characterization of the melt-frozen samples was performed to conrm their crystallinity aer melting and cooling.…”