Magnesium Borohydride Ammonia Borane as a Magnesium Ionic Conductor

Kisu, Kazuaki; Kim, Sangryun; Inukai, Munehiro; Oguchi, Hiroyuki; Takagi, Shigeyuki; Orimo, Shin Ichi

doi:10.1021/acsaem.0c00113

Cited by 69 publications

(105 citation statements)

References 30 publications

(66 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Metal borohydrides and derivatives thereof are a continuously expanding class of materials, and numerous new compositions have been reported in the past decade. − Besides high hydrogen densities, many of these materials exhibit other interesting properties such as magnetism, , luminescence, − or ionic conductivity. − Ammine metal borohydrides have been particularly investigated due to dihydrogen interactions, N–H δ+ ··· –δ H–B, which can facilitate the release of hydrogen at low temperatures. , Recently, these dihydrogen interactions have received new interest due to their influence on dynamics and crystal structures, ,, and it has been suggested that these interactions can facilitate fast ionic conductivity, forming the basis for a new type of solid-state electrolyte. ,, …”

Section: Introductionmentioning

confidence: 99%

Neutron Scattering Investigations of the Global and Local Structures of Ammine Yttrium Borohydrides

et al. 2021

View full text Add to dashboard Cite

Complex metal hydrides are a fascinating and continuously expanding class of materials with many properties relevant for solid-state hydrogen and ammonia storage and solidstate electrolytes. The crystal structures are often investigated using powder X-ray diffraction (PXD), which can be ambiguous. Here, we revisit the crystal structure of Y( 11 BD 4 ) 3 •3ND 3 with the use of neutron diffraction, which, in comparison to previous PXD studies, provides accurate information about the D positions in the compound. Upon cooling to 10 K, the compound underwent a polymorphic transition, and a new monoclinic low-temperature polymorph denoted as α-Y( 11 BD 4 ) 3 •3ND 3 was discovered. Furthermore, the series of Y( 11 BH 4 ) 3 •xNH 3 (x = 0, 3, and 7) were also investigated with inelastic neutron scattering and infrared spectroscopy techniques, which provided information of the local coordination environment of the 11 BH 4 − and NH 3 groups and unique insights into the hydrogen dynamics. Partial deuteration using ND 3 in Y( 11 BH 4 ) 3 •xND 3 (x = 3 and 7) allowed for an unambiguous assignment of the vibrational bands corresponding to the NH 3 and 11 BH 4 − in Y( 11 BH 4 ) 3 •xNH 3 , due to the much larger neutron scattering cross section of H compared to D. The vibrational spectra of Y( 11 BH 4 ) 3 •xNH 3 could roughly be divided into three regions: (i) below 55 meV, containing mainly 11 BH 4 − librational motions, (ii) 55−130 meV, containing mainly NH 3 librational motions, and (iii) above 130 meV, containing 11 B−H and N−H bending and stretching motions.

show abstract

Section: Introductionmentioning

confidence: 99%

Neutron Scattering Investigations of the Global and Local Structures of Ammine Yttrium Borohydrides

et al. 2021

View full text Add to dashboard Cite

show abstract

“…15 Very recent studies have shown the possibility to reach high ionic conductivities of about 10 −5 S•cm −1 close to room temperature by adding neutral molecules to Mg(BH 4 ) 2 . In this manner, Mg(en) 1 (BH 4 ) 2 with en being ethylene-diamine, Mg(BH 4 ) 2 -NH 3 , and Mg(BH 4 ) 2 (NH 3 BH 3 ) 2 reach ionic conductivities of 6 × 10 −5 S•cm −1 at 70 °C, 16 8.5 × 10 −5 S•cm −1 at 70 °C, 17 and 8.4 × 10 −5 S•cm −1 at 40 °C, 18 respectively. The latter is indeed the solid compound with the highest Mg 2+ ionic conductivity reported so far.…”

mentioning

confidence: 98%

Mg₃(BH₄)₄(NH₂)₂ as Inorganic Solid Electrolyte with High Mg²⁺ Ionic Conductivity

Ruyet

Fleutot

Berthelot

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Mg3(BH4)4(NH2)2 compound was synthesized through the investigation of the Mg(BH4)2-Mg(NH2)2 phase diagram; its crystal structure was solved in a tetragonal unit cell with the space group I-4. Interestingly, Mg3(BH4)4(NH2)2 has a high thermal stability with a decomposition temperature above 190°C and exhibits a high Mg 2+ ionic conductivity of 4.1x10 -5 S.cm -1 at 100°C with a low activation energy (0.84 eV). The reversible Mg deposition/stripping was demonstrated at 100°C when using Mg3(BH4)4(NH2)2 as solid electrolyte. Thus, Mg3(BH4)4(NH2)2 is a compound that could help to develop rechargeable Mg-ion solid-state batteries.

show abstract

“…In a feasibility study, we used the CMC electrolyte in a Ca–S battery exhibiting reversible discharge and charge abilities as well as a high capacity of 805 mAh g –1 , demonstrating that the CMC electrolyte is compatible with a Ca–S battery system. The development of a promising electrolyte candidate based on complex hydrides compatible with Ca batteries will create future opportunities for exploring other related complex hydride compounds as Ca salts 26 , 49 – 52 . In addition, the absence of fluorine and CaF 2 formation in these materials will intrinsically pave the way for achieving high cyclability in Ca batteries.…”

Section: Resultsmentioning

confidence: 99%

Monocarborane cluster as a stable fluorine-free calcium battery electrolyte

Kisu

Kim

Shinohara

et al. 2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

High-energy-density and low-cost calcium (Ca) batteries have been proposed as ‘beyond-Li-ion’ electrochemical energy storage devices. However, they have seen limited progress due to challenges associated with developing electrolytes showing reductive/oxidative stabilities and high ionic conductivities. This paper describes a calcium monocarborane cluster salt in a mixed solvent as a Ca-battery electrolyte with high anodic stability (up to 4 V vs. Ca2+/Ca), high ionic conductivity (4 mS cm−1), and high Coulombic efficiency for Ca plating/stripping at room temperature. The developed electrolyte is a promising candidate for use in room-temperature rechargeable Ca batteries.

show abstract

Magnesium Borohydride Ammonia Borane as a Magnesium Ionic Conductor

Cited by 69 publications

References 30 publications

Neutron Scattering Investigations of the Global and Local Structures of Ammine Yttrium Borohydrides

Neutron Scattering Investigations of the Global and Local Structures of Ammine Yttrium Borohydrides

Mg₃(BH₄)₄(NH₂)₂ as Inorganic Solid Electrolyte with High Mg²⁺ Ionic Conductivity

Monocarborane cluster as a stable fluorine-free calcium battery electrolyte

Contact Info

Product

Resources

About

Magnesium Borohydride Ammonia Borane as a Magnesium Ionic Conductor

Cited by 69 publications

References 30 publications

Neutron Scattering Investigations of the Global and Local Structures of Ammine Yttrium Borohydrides

Neutron Scattering Investigations of the Global and Local Structures of Ammine Yttrium Borohydrides

Mg3(BH4)4(NH2)2 as Inorganic Solid Electrolyte with High Mg2+ Ionic Conductivity

Monocarborane cluster as a stable fluorine-free calcium battery electrolyte

Contact Info

Product

Resources

About

Mg₃(BH₄)₄(NH₂)₂ as Inorganic Solid Electrolyte with High Mg²⁺ Ionic Conductivity