Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 8, Pages 11662-11667Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.01.004
Keywords
Solid-state electrolytes; LATP; Sintering aid LiBF4; Li-ion conductor
Categories
Funding
- National Key Research and Development Program of China [2017YFB0310300]
- Natural Science Foundation of Liaoning Province [2019DZ0090]
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The addition of LiBF4 as a sintering aid can promote grain growth and improve ionic conductivity of LATP. The formation of solid solution phase between LiBF4 and LATP leads to the gradual disappearance of grain boundaries.
To improve sintering performance, LiBF4, as a novel sintering aid, was added to a NASICON-type solid electrolyte LATP, which was synthesized by the sol-gel method. The microstructure, crystallinity and lithium-ion conductivity of the obtained LATP was measured by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Raman spectroscopy, MAS NMR and impedance spectroscopy (IS). Results indicate that during sintering, LiBF4 not only forms liquid phase to promote the growth of grains, but also forms a replacement solid solution with LATP. A small amount of boron and fluorine substitutes phosphorus and oxygen, thus entering the LATP lattice and forming a channel that is more suitable for Li-ion migration. The formation of the solid solution phase of LiBF4 and LATP also leads to the gradual disappearance of grain boundaries, which further promotes the improvement in ionic conductivity. The highest ionic conductivity of the LATP sintered pellet obtained with 3 wt% LiBF4 is 0.85 mScm(-1).
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