All solid Li-ion batteries display high stability and longevity but are hampered by the poor conductivity of most solid electrolytes. The influence of applied electrical fields during sintering on microstructure and electronic properties of lithium aluminum titanium phosphate (Li1.3Al0.3Ti1.7(PO4)3, LATP) electrolyte material was investigated by sintering LATP pellets under DC voltages of 0V, 2V, 10V, and 20V, followed by characterization via scanning electron microscopy (SEM) and impedance spectroscopy. The application of a DC voltage increased the relative density to a maximum of 95.5%. However, unlike reports on other material systems such as zirconia, a high DC voltage induced rather than restrained abnormal grain growth. Resistivity increased with applied voltage from 2.1kΩ·cm at 0V to 7.8kΩ·cm at 20V, which was attributed to the high faceting and poor grain to grain contact of the grains sintered under 10V and 20V.
Solid State Ionics – Elsevier
Published: Oct 1, 2015
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