IR characterizations of lithium imide and amide

Kojima, Yoshitsugu; Kawai, Yasuhiko

doi:10.1016/j.jallcom.2004.10.063

Cited by 156 publications

(136 citation statements)

References 18 publications

(27 reference statements)

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“…[23]. [2,3] , 41.6 [33] 110 116 [33] 426 (iii) MgH 2 → Mg H 2 7.67 62 53 63 74.6 [34] 137 134.8 [34] 458 (iv) LiH LiNH 2 → Li 2 NH H 2 6.53 83 65 72 66.1 [7] , 66.6 [8] 119 120 [8] H 2 at T = 0 K) is too low for reversibility under practical recharging conditions. [22] Reaction (ii): The next reaction is predicted to occur between LiH and Mg(NH 2 ) 2 at T = 426 K, leading to the formation of the mixed ternary imide, Li 2 Mg(NH) 2 , [23] and releasing 5.6 wt % of hydrogen [see rxn.…”

Section: LImentioning

confidence: 99%

“…Specifically, we present the application of our method to investigate the LiMg-N-H system, which has emerged as a promising hydrogen storage material after Chen et al [7] reported reversible extraction of H 2 from a mixture of LiNH 2 and LiH above 570 K. Although LiNH 2 + LiH can store hydrogen at reasonably high gravimetric densities, it cannot be used for on-board storage, as the temperatures required to extract H 2 are too high. Studies of the pressure-composition isotherms for the Li amide reaction have shown that LiNH 2 + LiH is thermodynamically too stable, with a dehydriding enthalpy of ∼ 66 kJ/mol H 2 , [7,8] well above the 20-50 kJ/mol H 2 range desired for reversible on-board storage. Many attempts have been made to effectively reduce the stability of the amide.…”

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confidence: 99%

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First‐Principles Determination of Multicomponent Hydride Phase Diagrams: Application to the Li‐Mg‐N‐H System

Akbarzadeh¹,

Ozoliņš²,

Wolverton³

2007

Advanced Materials

232

236

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Complex solid‐state hydrides can store hydrogen at very high volumetric and gravimetric densities. We present a theoretical framework, which automatically determines phase diagrams and thermodynamically favored hydrogen storage reactions in complex multicomponent systems, such as Li‐Mg‐N‐H (see figure). This method can be used to efficiently scan the phase space and pinpoint those compositions, which have the greatest potential for thermodynamically reversible H2 storage.

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Section: LImentioning

confidence: 99%

mentioning

confidence: 99%

First‐Principles Determination of Multicomponent Hydride Phase Diagrams: Application to the Li‐Mg‐N‐H System

Akbarzadeh¹,

Ozoliņš²,

Wolverton³

2007

Advanced Materials

232

236

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“…ρ (g/mL) ρ m (wt % [29][30][31] a Not catalysed. Decomposition temperatures strongly depend on the physical conditions for the measurement and the published data scatter significantly; b Reported for the LiNH 2 -LiH system; c Calculated based on the van't Hoff equation using ∆S = 130 J/(mol K).…”

Section: (G/mol)mentioning

confidence: 99%

Complex Metal Hydrides for Hydrogen, Thermal and Electrochemical Energy Storage

et al. 2017

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Hydrogen has a very diverse chemistry and reacts with most other elements to form compounds, which have fascinating structures, compositions and properties. Complex metal hydrides are a rapidly expanding class of materials, approaching multi-functionality, in particular within the energy storage field. This review illustrates that complex metal hydrides may store hydrogen in the solid state, act as novel battery materials, both as electrolytes and electrode materials, or store solar heat in a more efficient manner as compared to traditional heat storage materials. Furthermore, it is highlighted how complex metal hydrides may act in an integrated setup with a fuel cell. This review focuses on the unique properties of light element complex metal hydrides mainly based on boron, nitrogen and aluminum, e.g., metal borohydrides and metal alanates. Our hope is that this review can provide new inspiration to solve the great challenge of our time: efficient conversion and large-scale storage of renewable energy.

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“…(2) is completely replaced by the less stable Mg(NH 2 ) 2 , while LiNH 2 is still present in the reaction in Eq. (6). Further destabilization of the reactants in the reaction in Eq.…”

Section: -11mentioning

confidence: 99%