Halogenated Sodium-<i>closo</i>-Dodecaboranes as Solid-State Ion Conductors

Hansen, Bettina; Paskevicius, Mark; Jørgensen, Mathias; Jensen, Torben R.

doi:10.1021/acs.chemmater.6b04797

Cited by 83 publications

(113 citation statements)

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“…The mixed salt Na 2 [ closo ‐B 12 H 12 ] 0.5 [ closo ‐B 10 H 10 ] 0.5 was used for the construction of a stable 3 V all‐solid‐state sodium‐ion battery, which exemplifies the potential of these solid electrolytes. The study of metal‐ion conductivity of salts of anionic perhalogenated closo ‐boron clusters showed the potential of such salts for battery applications …”

Section: Borate Anions and Anionic Boron Clusters As Building Blocks mentioning

confidence: 99%

Boron: Its Role in Energy‐Related Processes and Applications

et al. 2020

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Boron's unique position in the Periodic Table, that is, at the apex of the line separating metals and nonmetals, makes it highly versatile in chemical reactions and applications. Contemporary demand for renewable and clean energy as well as energy‐efficient products has seen boron playing key roles in energy‐related research, such as 1) activating and synthesizing energy‐rich small molecules, 2) storing chemical and electrical energy, and 3) converting electrical energy into light. These applications are fundamentally associated with boron's unique characteristics, such as its electron‐deficiency and the availability of an unoccupied p orbital, which allow the formation of a myriad of compounds with a wide range of chemical and physical properties. For example, boron's ability to achieve a full octet of electrons with four covalent bonds and a negative charge has led to the synthesis of a wide variety of borate anions of high chemical and electrochemical stability—in particular, weakly coordinating anions. This Review summarizes recent advances in the study of boron compounds for energy‐related processes and applications.

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Section: Borate Anions and Anionic Boron Clusters As Building Blocks mentioning

confidence: 99%

Boron: Its Role in Energy‐Related Processes and Applications

et al. 2020

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“…Compositing higher boranes with amides, borohydrides, halides, etc., were found effective to enhance their ionic conductivity. Unlike order‐disorder‐governed dodeca‐ and decaboranes, the cationic mobility in Na 3 BH 4 B 12 H 12 or (Li 0.7 Na 0.3 ) 3 BH 4 B 12 H 12 is not entropically activated, thus requiring no HT phase transition for ionic conduction .…”

Section: Complex Hydrides As Solid‐state Electrolytementioning

confidence: 99%

Complex Hydrides for Energy Storage, Conversion, and Utilization

2019

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functionalities and exhibit great potentials for the applications in the energy transfer chain (Figure 1).In chemistry, a hydride is a compound having negatively charged hydrogen anion. [2] Nowadays, however, hydrogenous compounds having hydrogen bonded to metals or nonmetal in ionic, metallic or covalent manner are collectively referred as hydrides. [3] Complex hydride is such a class of compound having a general formula of M(XH n ) m , where M is usually a metal cation and X is a metal or nonmetal element which sets up covalent or ionocovalent bonding with H. [4] The M[XH n ] m is H-rich and can decompose selectively to H 2 allowing complex hydrides of light-weight elements potential hydrogen storage media. As a matter of fact, since the pioneering work of Ti-catalyzed NaAlH 4 in 1997, [5] extensive investigations on hydrogen storage over alanates, [6] amide-hydride composites, [7] borohydrides, [8] amidoboranes [9] as well as metallorganic hydrides [10] were carried out and tremendous progress has been made (Figure 2). [1,4a] The break and setup of XH bonding would be endergonic and exergonic, respectively. The energy input and output in hydrogen desorption and reabsorption over a complex hydride depends strongly on its thermodynamic stability, which also offers an opportunity of using complex hydrides as thermal energy storage materials to cope up with the intermittent, fluctuating and unstable supply of renewable energies. Owning to their exclusive advantages of diversity, high energy densities and tunability, complex hydrides have been actively pursued for this application since year 2000. [11] Solid electrolytes with fast conduction of Li, Na, or Mg ions are highly demanded for all-solid-state batteries with high energy density and safety. Coincidentally, complex hydrides are composed of those cations and a relatively large sized [XH n ] anion. The coordination flexibility of the large anion with alkali or alkaline earth cation would create some favorable structural features, such as defects and/or low-barrier diffusion channels, to facilitate cation migration within the lattice of complex hydrides. [12] Starting from the finding of high Li-ion conduction in the high-temperature-phase LiBH 4 , [13] a variety of complex hydrides has been developed, some of which show superior ion conductivity to their nonhydride peers. [14] Hydrogen storage over complex hydride would undergo dihydrogen dissociation into surface H atoms followed by H Functional materials are the key enabling factor in the development of clean energy technologies. Materials of particular interest, which are reviewed herein, are a class of hydrogenous compound having the general formula of M(XH n ) m , where M is usually a metal cation and X can be Al, B, C, N, O, transition metal (TM), or a mixture of them, which sets up an iono-covalent or covalent bonding with H. M(XH n ) m is generally termed as a complex hydride by the hydrogen storage community. The rich chemistry between H and B/C/N/O/Al/TM allows complex hydrides of diverse compo...

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“…So wurde beispielsweise das gemischte Salz Na 2 [ closo ‐B 12 H 12 ] 0.5 [ closo ‐B 10 H 10 ] 0.5 erfolgreich für die Konstruktion einer stabilen 3 V Feststoff‐Natriumbatterie eingesetzt . Auch die Salze perhalogenierter anionischer Borcluster weisen interessante Metallionenleitfähigkeiten auf, was diese Verbindungsklasse potentiell relevant für Batterieanwendungen macht …”

Section: Boratanionen Und Anionische Borcluster Als Bausteine Für Eneunclassified

Bor in energiebezogenen Prozessen und Anwendungen

et al. 2020

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Direkt an der Grenze zwischen Metallen und Nichtmetallen angesiedelt, nimmt das Element Bor eine einzigartige Position im Periodensystem ein. Diese besondere Stellung ermöglicht eine enorme Vielfalt an chemischen Reaktionen und Anwendungen. Auch in Hinblick auf die stetig steigende Nachfrage an erneuerbaren und sauberen Energien bzw. energieeffizienten Prozessen ist das Element Bor mehr und mehr in den Fokus der energiebezogenen Forschung gerückt und umfasst mittlerweile Bereiche wie 1) die Aktivierung und Synthese kleiner energiereicher Moleküle, 2) die Speicherung von chemischer und elektrischer Energie und 3) die Umwandlung von elektrischer Energie zu Licht. Diese Anwendungen basieren hierbei auf den besonderen Eigenschaften des Elements Bor, d. h. vor allem auf dessen Elektronenmangel in Verbindung mit der Gegenwart eines unbesetzten p‐Orbitals, was die Ausbildung unzähliger Verbindungen mit gezielt beeinflussbaren chemischen und physikalischen Eigenschaften ermöglicht. So erreicht Bor beispielsweise mit vier kovalenten Bindungen und einer negativen Ladung relativ einfach ein Elektronenoktett, wodurch die Verbindungsklasse der Boratanionen zugänglich wird, welche eine außergewöhnlich hohe chemische und elektrochemische Stabilität aufweisen. Besonders hervorzuheben ist in diesem Zusammenhang die synthetisch wertvolle Klasse der schwach‐koordinierenden Anionen. Dieser Aufsatz soll die Bedeutung von Borverbindungen für energiebezogene Prozesse und Anwendungen verdeutlichen und fasst die Fortschritte der letzten Jahre auf diesem Gebiet zusammen.

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Halogenated Sodium-closo-Dodecaboranes as Solid-State Ion Conductors

Cited by 83 publications

References 53 publications

Boron: Its Role in Energy‐Related Processes and Applications

Boron: Its Role in Energy‐Related Processes and Applications

Complex Hydrides for Energy Storage, Conversion, and Utilization

Bor in energiebezogenen Prozessen und Anwendungen

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