A Metal–Organic Framework with Tetrahedral Aluminate Sites as a Single‐Ion Li+ Solid Electrolyte

We demonstrate the synthesis of the first anionic aluminum metal–organic framework (MOFs) constructed from tetrahedral AlO4 sites. Al‐Td‐MOF‐1 was obtained in a simple two‐step synthesis by condensation of 1,4‐dihydroxybenzene and lithium aluminum hydride into an amorphous aluminate framework before...

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Bibliographic Details
Published in:Angewandte Chemie 2018-12, Vol.130 (51), p.16925-16929
Main Authors: Fischer, Sabrina, Roeser, Jérôme, Lin, Terri C., DeBlock, Ryan H., Lau, Jonathan, Dunn, Bruce S., Hoffmann, Frank, Fröba, Michael, Thomas, Arne, Tolbert, Sarah H.
Format: Article
Language:English
Subjects:
Aluminum
Aluminum hydrides
Apertures
Chemical composition
Chemical synthesis
Chemistry
Condensates
Conductivity
Crystal structure
Crystallinity
Electrolytes
Festkörperelektrolyte
Ion currents
Lithium
Lithium aluminum hydrides
Lithiumionenleiter
Metal-organic frameworks
Metall-organische Gerüste
Metals
Mikroporöse Materialien
Organic chemistry
Solid electrolytes
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Summary:We demonstrate the synthesis of the first anionic aluminum metal–organic framework (MOFs) constructed from tetrahedral AlO4 sites. Al‐Td‐MOF‐1 was obtained in a simple two‐step synthesis by condensation of 1,4‐dihydroxybenzene and lithium aluminum hydride into an amorphous aluminate framework before applying a solvothermal treatment under basic conditions to obtain the crystalline Al‐Td‐MOF‐1 with a chemical composition of Li[Al(C6H4O2)2]. The overall Al‐Td‐MOF‐1 structure consists of one‐dimensional chains of alternating edge‐sharing AlO4 and LiO4 tetrahedral sites describing unidirectional pore channels with a square window aperture of ≈5×5 Å2, best described topologically as a uninodal 6‐coordinated snp rod net. Al‐Td‐MOF‐1 features the highest Li+ loading reported to date for a MOF (2.50 wt %) and proved to be an effective single‐ion solid electrolyte. An ionic conductivity of 5.7×10−5 S cm−1 was measured for Al‐Td‐MOF‐1 and the beneficial contribution of crystallinity was evidenced by an 8‐fold increase in conductivity between the disordered and crystalline material. Li+‐Leiter: Eine anionische Aluminium‐basierte Metall‐organische Gerüstverbindung (MOF) wurde hergestellt, die die höchste bisher berichtete Li+‐Beladung (2.50 Gew.‐%) sowie eine Ionenleitfähigkeit von 5.7×10−5 S cm−1 aufweist.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201808885