Lithium ion conductor precursor glass and lithium ion conductor

Abstract

As a solid electrolyte used in a lithium ion secondary battery, it has not been possible to obtain a lithium ion conductor precursor glass and a lithium ion conductor in which crystallization progresses at low temperatures and which exhibit high ion conductivity. The present invention can obtain a lithium ion conductor precursor glass and a lithium ion conductor in which crystallization progresses even at low temperatures and which exhibit high ion conductivity by containing 10-35% of a Li2O component, 20-50% of a P2O5 component, greater than 0% to 15% of an Al2O3 component, 20-50% of a GeO2 component and greater than 0% to 15% of a B2O3 component and/or a TeO2 component.

1 . A lithium ion conductor precursor glass, comprising:
 a Li 2 O component in an amount of 10 to 35%,   a P 2 O 5  component in an amount of 20 to 50%,   an Al 2 O 3  component in an amount of greater than 0% to 15%,   a GeO 2  component in an amount of 20 to 50%, and   a Bi 2 O 3  component or/and a TeO 2  component in an amount of greater than 0% to 15%,   with % representing mol %.   
     
     
         2 . The lithium ion conductor precursor glass according to  claim 1 , wherein a mass ratio of (Bi 2 O 3  or/and TeO 2 )/GeO 2  is 1.0 or less. 
     
     
         3 . The lithium ion conductor precursor glass according to  claim 1 , wherein T X  temperature in TG-DTA measurement is less than 590° C. 
     
     
         4 . A lithium ion conductor, wherein the lithium ion conductor is obtained by subjecting the lithium ion conductor precursor glass according to  claim 1 , to a heat treatment, so that the lithium ion conductor precursor glass crystalizes. 
     
     
         5 . The lithium ion conductor according to  claim 4 , wherein a crystal of Li 1+x Al x Ge 2−x (PO 4 ) 3  (0<x<2) is precipitated. 
     
     
         6 . The lithium ion conductor according to  claim 4 , wherein lithium ion conductivity at 25° C. is 1×10 −7  S/cm or more. 
     
     
         7 . The lithium ion conductor according to  claim 4 , wherein the lithium ion conductor is used in a solid electrolyte for a lithium ion battery. 
     
     
         8 . An electrode composite element, comprising 1.0 to 99.9 volume % of a positive or negative active material and 0.1 to 99.0 volume % of the lithium ion conductor according to  claim 4 . 
     
     
         9 . A lithium ion half cell or a lithium ion battery, comprising the electrode composite element according to  claim 8 .