Lithium scandium phosphate-based electrolytes for solid state lithium rechargeable microbatteries

• Published in: Solid state ionics Vol. 60; no. 4; pp. 357 - 365
• Main Authors: Amatucci, G.G., Safari, A., Shokoohi, F.K., Wilkens, B.J.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.1993; Elsevier Science
• Subjects: Chemistry; Electrochemistry; Electrodes: preparations and properties; Exact sciences and technology; General and physical chemistry; Other electrodes; Electrolyte solution; Lithium Perchlorates; Ionic conductivity; Insertion; Aluminium; Experimental study; Lattice parameters; X ray diffraction; Thin film; Electrodes; Organic solvent; Lithium Scandium Phosphates Mixed; Stainless steel; Battery; Porosity; Yttrium; Activation energy; Modified material
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/0167-2738(93)90015-U

Li 3Sc 2(PO 4) 3 is a promising candidate for use as an electrolyte in solid state lithium rechargeable microbatteries due to its stability in air, ease of preparation, and resistance to dielectric breakdown. The room temperature ionic conductivity was optimized resulting in an increase of over two orders of magnitude to 3×10 −6 S/ cm. The formation of Li 3(Sc 2− x M x )(PO 4) 3, where M= Al 3+ or Y 3+, resulted in the decrease of porosity, greater sinterability, and considerable enhancement of the ionic conductivity. Yttrium substitutions enhanced the conductivity slightly while aluminum increased the room temperature ionic conductivity to 1.5×10 −5 S/ cm for x=0.4. Preliminary electron beam evaporation of Li 3Sc 2(PO 4) 3 yielded amorphous thin films with ion ic conductivity as high as 5×10 −5 S/ cm and a composition of Li 4.8Sc 1.4(PO 4) 3.