Ionic Conductivity of Solid Electrolytes Based on Lithium Titanium Phosphate

Abstract

Solid electrolytes based on lithium titanium phosphate were prepared,and their phase, porosity of the sintered pellets, and electricalconductivity were studied. The conductivity was increased and theporosity decreased greatly by partially replacing Ti4+ and P5+ inLiTi2(PO4)3with M3+ and Si4+ ions, respectively. The maximum conductivityat 298 K is 7 * 10^-4 Scm-1 for 0.3M (Al/Sc). The conductivity wasconsiderably increased by the mixing of binders. The main reasonfor the conductivity enhancement of these electrolytes seems to beattributable to the increase of the sintered pellet density withthe enhancement of the lithium concentration at the grain boundaries.