PREPARATION OF Li_1.5Al_0.5Ge_1.5(PO₄)₃ SOLID ELECTROLYTE BY SOL-GEL METHOD

Abstract

Li 1+x Al x Ge 2-x (PO 4 ) 3 (LAGP) solid electrolyte is one of the promising solid electrolytes for lithium ion batteries. The LAGP electrolyte was prepared by a sol-gel method. A gelation powder was calcined at 500 o C to obtain precursor powder for LAGP. The obtained powder was pelletized and calcined at 800, 850, and 900 o C. The pellets possessed NASICON structure, indicating that the LAGP was successfully prepared. The pellet calcined at 850 o C showed the highest lithium ion conductivity, 1.4×10 -4 S cm -1 , which is acceptable for all-solid-state lithium battery. Although some modification is still needed to improve the lithium ion conductivity of LAGP prepared by the sol-gel method, this finding provides us a new route for LAGP preparation.

A facile method for the synthesis of the Li0.3La0.57TiO3 solid state electrolyte

“…[12][13][14] Among the existing inorganic electrolytes, lithium lanthanum titanate (LLTO) has been identified as the most promising one in view of its high lithium ionic conductivity, typically on the order of 10 À4 -10 À3 S cm À1 (for single crystalline grains). 10,[15][16][17][18] Such a conductivity level is averagely higher than that for Na super-ionic conductor-type phosphate, which is another inorganic solid state electrolyte with great potential, 10,[19][20][21] and is apparently 1-2 orders of magnitude higher than the conductivities of other inorganic solid electrolytes, such as 10 À6 -10 À4 S cm À1 for garnet structure materials, [22][23][24] and 10 À5 -10 À3 S cm À1 for Li 2 S-based oxysulfide glasses. 25,26 In addition to the advantage of having high conductivity, good thermal stability and the use of nontoxic elements are also amongst the merits of lithium lanthanum titanate over other inorganic solid state electrolytes.…”