期刊
ADVANCED FUNCTIONAL MATERIALS
卷 25, 期 2, 页码 184-192出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201402538
关键词
nanoconfinement; ionic conductors; solid electrolytes; nuclear magnetic resonance; impedance spectroscopy
类别
资金
- Danish Agency for Science, Technology and Innovation (DASTI) through the project InterBat (Interfaces and Reactions in Batteries)
- COST action [MP1103]
- Dutch organization for scientific research (NWO ACTS Sustainable Hydrogen)
Designing new functional materials is crucial for the development of efficient energy storage and conversion devices such as all solid-state batteries. LiBH4 is a promising solid electrolyte for Li-ion batteries. It displays high lithium mobility, although only above 110 degrees C at which a transition to a high temperature hexagonal structure occurs. Herein, it is shown that confining LiBH4 in the pores of ordered mesoporous silica scaffolds leads to high Li+ conductivity (0.1 mS cm(-1)) at room temperature. This is a surprisingly high value, especially given that the nanocomposites comprise 42 vol% of SiO2. Solid state Li-7 NMR confirmed that the high conductivity can be attributed to a very high Li+ mobility in the solid phase at room temperature. Confinement of LiBH4 in the pores leads also to a lower solid-solid phase transition temperature than for bulk LiBH4. However, the high ionic mobility is associated with a fraction of the confined borohydride that shows no phase transition, and most likely located close to the interface with the SiO2 pore walls. These results point to a new strategy to design low-temperature ion conducting solids for application in all solid-state lithium ion batteries, which could enable safe use of Li-metal anodes.
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