Lithium Borohydride

Banfi, Luca; Narisano, Enrica; Riva, Renata; Baxter, Ellen W.

doi:10.1002/047084289x.rl061.pub2

Cited by 3 publications

(2 citation statements)

References 94 publications

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“…On the basis of the above findings, and combining knowledge of metal borohydride solubilities and employing THF (or Et 2 O) as solvent with DMSB, a highly efficient synthesis methodology for certain metal borohydrides was devised. For instance, LiBH 4 is highly soluble in THF (and Et 2 O) at RT, − while Ca(BH 4 ) 2 , Sr(BH 4 ) 2 , and Sm(BH 4 ) 2 are reasonably soluble in THF (see Table and references therein). − Thus, LiBH 4 · x THF, LiBH 4 ·1Et 2 O, Ca(BH 4 ) 2 ·2THF, Sr(BH 4 ) 2 ·2THF, and Sm(BH 4 ) 2 ·1THF (Table entries 1c / 1d / 4c / 5c / 9c ) are obtained after concentration of the respective THF or Et 2 O solutions. Reactions performed in THF and the synthesis of LiBH 4 in Et 2 O were all complete in less than 24 h. NaBH 4 , however, is not appreciably soluble in Et 2 O or THF, but synthesis at slightly elevated temperatures in toluene was complete after 24 h (Table , 2b ).…”

Section: Resultsmentioning

confidence: 99%

From Metal Hydrides to Metal Borohydrides

et al. 2018

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Commencing from metal hydrides, versatile synthesis, purification, and desolvation approaches are presented for a wide range of metal borohydrides and their solvates. An optimized and generalized synthesis method is provided for 11 different metal borohydrides, M(BH) , (M = Li, Na, Mg, Ca, Sr, Ba, Y, Nd, Sm, Gd, Yb), providing controlled access to more than 15 different polymorphs and in excess of 20 metal borohydride solvate complexes. Commercially unavailable metal hydrides (MH, M = Sr, Ba, Y, Nd, Sm, Gd, Yb) are synthesized utilizing high pressure hydrogenation. For synthesis of metal borohydrides, all hydrides are mechanochemically activated prior to reaction with dimethylsulfide borane. A purification process is devised, alongside a complementary desolvation process for solvate complexes, yielding high purity products. An array of polymorphically pure metal borohydrides are synthesized in this manner, supporting the general applicability of this method. Additionally, new metal borohydrides, α-, α'- β-, γ-Yb(BH), α-Nd(BH) and new solvates Sr(BH)·1THF, Sm(BH)·1THF, Yb(BH)· xTHF, x = 1 or 2, Nd(BH)·1MeS, Nd(BH)·1.5THF, Sm(BH)·1.5THF and Yb(BH)· xMeS (" x" = unspecified), are presented here. Synthesis conditions are optimized individually for each metal, providing insight into reactivity and mechanistic concerns. The reaction follows a nucleophilic addition/hydride-transfer mechanism. Therefore, the reaction is most efficient for ionic and polar-covalent metal hydrides. The presented synthetic approaches are widely applicable, as demonstrated by permitting facile access to a large number of materials and by performing a scale-up synthesis of LiBH.

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Section: Resultsmentioning

confidence: 99%

From Metal Hydrides to Metal Borohydrides

et al. 2018

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“…Cyclohexane was purchased as HPLC grade from Sigma-Aldrich and dried using a LC Technology SP-1 Solvent Purification System. Except for LiBH 4 , all chemicals were used without further purification. All operations were carried out under inert atmosphere in an argon-filled LC-Technology glovebox (<1 ppm of O 2 and H 2 O).…”

Section: Methodsmentioning

confidence: 99%

LiBH₄ Electronic Destabilization with Nickel(II) Phthalocyanine—Leading to a Reversible Hydrogen Storage System

Lai

Quadir

Aguey‐Zinsou

2018

ACS Appl. Energy Mater.

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Precipitation of a LiBH 4 solution into an antisolvent led to formation of nanoparticles in the size range of 2 to 18 nm. By direct deposition of these nanoparticles onto a nickel(II) phthalocyanine substrate, LiBH 4 was destabilized and the hydrogen release temperature was dramatically reduced to 350 °C through a single step decomposition. Remarkably, upon hydrogen release and uptakes, the morphology of the material evolved to single crystal "plates"-like particles and a reversible hydrogen storage capacity of 3.2 mass% at 350 °C under 6 MPa H 2 pressure was observed. As evident by X-ray photoelectron spectroscopy analysis, such an enhancement is believed to result from the effective electron transfer interplay between LiBH 4 , LiH, B, and the nickel(II) phthalocyanine, enabling a destabilization of LiBH 4 and the facile rehydrogenation of LiH and B into LiBH 4 . This study thus reveals a novel approach to destabilize LiBH 4 by the use of an "electron active" substrate.

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Investigating the Factors Affecting the Ionic Conduction in Nanoconfined NaBH4

2021

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Nanoconfinement is an effective strategy to tune the properties of the metal hydrides. It has been extensively employed to modify the ionic conductivity of LiBH4 as an electrolyte for Li-ion batteries. However, the approach does not seem to be applicable to other borohydrides such as NaBH4, which is found to reach a limited improvement in ionic conductivity of 10−7 S cm−1 at 115 °C upon nanoconfinement in Mobil Composition of Matter No. 41 (MCM-41) instead of 10−8 S cm−1. In comparison, introducing large cage anions in the form of Na2B12H12 naturally formed upon the nanoconfinement of NaBH4 was found to be more effective in leading to higher ionic conductivities of 10−4 S cm−1 at 110 °C.

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Lithium Borohydride

Cited by 3 publications

References 94 publications

From Metal Hydrides to Metal Borohydrides

From Metal Hydrides to Metal Borohydrides

LiBH₄ Electronic Destabilization with Nickel(II) Phthalocyanine—Leading to a Reversible Hydrogen Storage System

Investigating the Factors Affecting the Ionic Conduction in Nanoconfined NaBH4

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Lithium Borohydride

Cited by 3 publications

References 94 publications

From Metal Hydrides to Metal Borohydrides

From Metal Hydrides to Metal Borohydrides

LiBH4 Electronic Destabilization with Nickel(II) Phthalocyanine—Leading to a Reversible Hydrogen Storage System

Investigating the Factors Affecting the Ionic Conduction in Nanoconfined NaBH4

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Product

Resources

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LiBH₄ Electronic Destabilization with Nickel(II) Phthalocyanine—Leading to a Reversible Hydrogen Storage System