Solid electrolyte production method
Provided is a method of producing a solid electrolyte having high ionic conductivity using a liquid phase method, including a first step of mixing two or more compounds satisfying (1) and a complexing agent 1 satisfying (2), and a second step of further mixing in a complexing agent 2 satisfying (3) after the first step. (1) A compound containing one or more selected from a group consisting of a lithium element, a sulfur element, a phosphorus element and a halogen element. (2) A complexing agent capable of forming a complex containing Li 3 PS 4 and a halogen element. (3) A complexing agent other than the complexing agent 1, capable of forming a complex containing Li 3 PS 4 .
1 . A method of producing a solid electrolyte comprising a lithium element, a sulfur element, a phosphorus element and a halogen element, said method comprising a first step of mixing two or more compounds satisfying (1) and a complexing agent 1 satisfying (2), and a second step of further mixing in a complexing agent 2 satisfying (3) after the first step:
(1) a compound containing one or more selected from the group consisting of a lithium element, a sulfur element, a phosphorus element and a halogen element;
(2) a complexing agent 1 capable of forming a complex containing Li 3 PS 4 and a halogen element, wherein the complexing agent 1 contains a nitrogen element;
(3) a complexing agent 2 other than the complexing agent 1, capable of forming a complex containing Li 3 PS 4 , wherein the complexing agent 2 contains an oxygen element; and
wherein said two or more compounds satisfying (1), taken together, comprise all of a lithium element, a sulfur element, a phosphorus element and a halogen element.
2 . The method of producing a solid electrolyte according to claim 1 , wherein the complexing agent 1 has two or more amino groups.
3 . The method of producing a solid electrolyte according to claim 1 , wherein the complexing agent 2 has one or more groups selected from a group consisting of an ether group and an ester group.
4 . The method of producing a solid electrolyte according to claim 1 , wherein the complexing agent 1 is tetramethylethylenediamine.
5 . The method of producing a solid electrolyte according to claim 1 , wherein the complexing agent 2 is tetrahydrofuran.
6 . The method of producing a solid electrolyte according to claim 1 , wherein the complexing agent 2 is dimethoxyethane.
7 . The method of producing a solid electrolyte according to claim 1 , wherein the complexing agent 1 is added in an amount with a molar ratio of 0.1 or more and 2.0 or less with respect to a total molar amount of Li atoms contained in two or more compounds satisfying (1).
8 . The method of producing a solid electrolyte according to claim 1 , wherein the complexing agent 2 is added in an amount with a molar ratio of 1.0 or more and 5.0 or less with respect to a total molar amount of Li 3 PS 4 that can be produced from two or more compounds satisfying (1).
9 . The method of producing a solid electrolyte according to claim 1 , wherein a compound satisfying (1) contains lithium halide.
10 . The method of producing a solid electrolyte according to claim 1 , wherein a compound satisfying (1) contains a single halogen.
11 . The method of producing a solid electrolyte according to claim 1 , wherein the halogen element is a bromine element and an iodine element.
12 . The method of producing a solid electrolyte according to claim 1 , wherein a compound satisfying (1) includes lithium sulfide and diphosphorus pentasulfide.
13 . The method of producing a solid electrolyte according to claim 1 , wherein a compound satisfying (1) includes Li 3 PS 4 .
14 . The method of producing a solid electrolyte according to claim 1 , wherein pulverization mixing is not performed in the first step.
15 . The method of producing a solid electrolyte according to claim 1 , wherein the solid electrolyte contains a thio-LISICON Region II-type crystal structure.
16 . The method of producing a solid electrolyte according to claim 1 , wherein the solid electrolyte does not have diffraction peaks at 2θ=17.5° and 26.1° in an X-ray diffractometry using a CuKα ray.