Preparing lithium-aluminum-titanium phosphate compounds useful for preparing solid-state electrolyte for lithium ion batteries, comprises e.g. providing aqueous solutions of lithium, aluminum, and phosphate salts, and forming sol

摘要

Preparing lithium-aluminum-titanium phosphate compounds (I), comprises (a) providing aqueous solutions of lithium-, aluminum-, and phosphate salts, (b) mixing lithium and aluminum salt solutions with titanium alkoxide and optionally with an orthosilicate in proportions required to form a sol, (c) adding the phosphate salt solution to form gel, (d) drying the gel, and (e) heat treating the dried residue by heating the dried gel slowly to 600-1000[deg] C at a heating rate of 0.1-10[deg] C/minute and calcining the dried gel at a final temperature for 1-24hours. Preparing lithium-aluminum-titanium phosphate compounds of formula (Li 1 + x + yAl xTi 2 - xSi yP 3 - yO 1 2) (I), comprises (a) providing aqueous solutions of lithium-, aluminum-, and phosphate salts, (b) mixing lithium- and aluminum salt solutions with titanium alkoxide and optionally with an orthosilicate in proportions required to form a sol, (c) adding the phosphate salt solution to form gel, (d) drying the gel, and (e) heat treating the dried residue by heating the dried gel slowly to 600-1000[deg] C at a heating rate of 0.1-10[deg] C/minute and calcining the dried gel at a final temperature for 1-24hours. x : greater than 0-0.4; and y : 0-0.6. Independent claims are also included for: (1) preparing solid-state electrolyte made of (I) for lithium ion batteries, comprising the steps (a)-(e), and sintering under uniaxial pressure of 5-50 MPa at 650-1250[deg] C for 3-60 minutes; and (2) producing solid-state electrolyte on a substrate, comprising (i) preparing a gel by the steps (a)-(c), (ii) applying the gel on the substrate to be coated, (iii) drying, heat treating and calcining the gel on the substrate by the steps (d)-(f), and (iv) sintering the coated substrate under uniaxial pressure of 0.1-5 MPa at 650-1250[deg] C for 3-30 minutes; and (3) the solid-state electrolyte made of (I) for lithium ion batteries, produced by the above method.