LITHIUM SOLID ELECTROLYTE

• US 20180205116A1
• Filed: 07/08/2016
• Published: 07/19/2018
• Est. Priority Date: 07/09/2015
• Status: Active Grant

• Current Assignee: Tokyo Institute of Technology (National University Corporation Tokyo Institute of Technology), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Tokyo Institute of Technology (National University Corporation Tokyo Institute of Technology), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: KANNO, Ryoji, INOUE, Yuki
• Granted Patent: US 10,541,443 B2
• Time in Patent Office: Days
• CPC Class Codes: C01B 25/14 Sulfur, selenium, or tellurium compounds of phosphorus
• CPC Class Codes: H01B 1/10 sulfides
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 2300/0065 Solid electrolytes
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: H01M 4/64 Carriers or collectors
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

(Problem to be Solved) A solid electrolyte material with favorable ion conductivity is demanded from the viewpoint of the higher output of a battery. The present invention was made in view of the above-described problems, with an object of providing a sulfide solid electrolyte material with favorable Li ion conductivity and providing a lithium battery including the sulfide solid electrolyte material. (Solution) There are provided: a solid electrolyte including a sulfide-based solid electrolyte represented by a composition formula: (Li₂S)_x(MS₂)_y(P₂S₅)_z, in which M is at least one selected from the group consisting of Ge, Sb, Si, Sn, B, Al, Ga, In, Zr, V, and Nb, and 0.53≤x≤0.74, 0.13≤y≤0.37, 0.04≤z≤0.15, and x+y+z=1 are satisfied; and a lithium battery including the solid electrolyte.

Claims

1. A solid electrolyte comprising a sulfide-based solid electrolyte represented by a composition formula:

(Li₂S)_x(MS₂)_y(P₂S₅)_z, wherein

M is at least one selected from the group consisting of Ge, Sb, Si, Sn, B, Al, Ga, In, Zr, V, and Nb; and

0.53≤

x≤

0.74, 0.13≤

y≤

0.37, 0.04≤

z≤

0.15, and x+y+z=1 are satisfied.

2. The solid electrolyte according to claim 1, wherein at least some of the sulfide-based solid electrolytes comprise characteristic peaks at least diffraction angles (2θ

) in vicinities of 15.9°

, 18.3°

, 25.9°

, 30.4°

, 31.8°

, 40.3°

, 41.3°

, 45.5°

, and 48.4°

in powder X-ray diffractometry with a Cu-Kα

ray having an X-ray wavelength of 1.5418 Å

.

3. A lithium battery comprising the solid electrolyte according to claim 1.

4. A lithium battery comprising the solid electrolyte according to claim 2.