Journal article
Layered double hydroxides as advanced tracks to promote ionic conductivity in metal borohydride
Department of Energy Conversion and Storage, Technical University of Denmark1
Atomic Scale Materials Modelling, Department of Energy Conversion and Storage, Technical University of Denmark2
Beijing University of Chemical Technology3
Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark4
Solid-state electrolytes (SSEs) are highly desirable for next-generation energy storage and conversion devices. Herein, composite SSEs based on layered double hydroxides (LDHs)/metal-borohydrides (M-BH4 with M = Li, Na, Mg), with a remarkable increase in ionic conductivities, are proposed. The two-dimensional (2D) host layers of LDH, with rich surface hydroxyl groups, maximize the interface interacting area with M-BH4.
The consequent defects of the interfacial M-BH4 enable a lower activation energy for boosting ion transfer. As a result, the surfaces of the LDHs serve as an advanced track for improving the ionic mobility of M-BH4. The resultant MgAl-LDH/LiBH4 exhibited a five order of magnitude increase in the room temperature ionic conductivity, reaching values of up to 0.31 mS cm−1, which is superior to most of the previously reported LiBH4-based SSEs.
This work provides a new perspective for understanding how the surface effect promotes ionic conductivity of composite SSEs and an avenue towards the realization of low-temperature advanced SSEs.
Language: | English |
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Year: | 2021 |
Pages: | 4989-4996 |
ISSN: | 20521537 and 20521529 |
Types: | Journal article |
DOI: | 10.1039/D1QM00059D |
ORCIDs: | Hansen, Heine Anton , Blanchard, Didier and 0000-0003-0802-9898 |