Solid electrolyte and battery using same

Patent metadata

Field	Value
Publication number	US-2021184253-A1
Application number	US-202117184735-A
Country	US
Kind code	A1
Filing date	Feb 25, 2021
Priority date	Nov 16, 2018
Publication date	Jun 17, 2021
Grant date	—

Abstract

A solid electrolyte according to the present disclosure includes first particles consisted of a first solid electrolyte material and second particles consisted of a second solid electrolyte material. The first solid electrolyte material has a higher ionic conductivity than the second solid electrolyte material. The second solid electrolyte material has a lower Young's modulus than the first solid electrolyte material.

First claim

What is claimed is:

1 . A solid electrolyte comprising:
first particles consisted of a first solid electrolyte material; and second particles consisted of a second solid electrolyte material, wherein the first solid electrolyte material has a higher ionic conductivity than the second solid electrolyte material, and the second solid electrolyte material has a lower Young's modulus than the first solid electrolyte material.

2 . The solid electrolyte according to claim 1 ,
wherein the first solid electrolyte material contains at least one selected from the group consisting of a sulfide, an oxide, and a halide.

3 . The solid electrolyte according to claim 2 ,
wherein the first solid electrolyte material contains an argyrodite sulfide.

4 . The solid electrolyte according to claim 3 ,
wherein the argyrodite sulfide is represented by composition formula Li α PS β Cl γ , where 5.5≤α≤6.5, 4.55≤β≤5.5, and 0.5≤γ≤1.5.

5 . The solid electrolyte according to claim 1 ,
wherein the second solid electrolyte material contains at least one selected from the group consisting of a sulfide, an oxide, and a halide.

6 . The solid electrolyte according to claim 5 ,
wherein the second solid electrolyte material is selected from a sulfide, and the sulfide contains lithium sulfide and phosphorus sulfide.

7 . The solid electrolyte according to claim 6 ,
wherein the sulfide contains Li p S—P q S 5 , and the following two formulas are satisfied: 1.5≤p≤2.5, and 1.5≤q≤2.5.

8 . The solid electrolyte according to claim 5 ,
wherein the second solid electrolyte material contains a glass sulfide containing a triclinic crystal as a main component.

9 . The solid electrolyte according to claim 1 , further comprising:
a particle boundary layer consisted of a third solid electrolyte material, wherein the particle boundary layer has a thickness smaller than a particle size of the first particles and a particle size of the second particles, and the third solid electrolyte material has a Young's modulus lower than or equal to the Young's modulus of the second solid electrolyte material.

10 . The solid electrolyte according to claim 9 ,
wherein the third solid electrolyte material has a lower Young's modulus than the second solid electrolyte material.

11 . The solid electrolyte according to claim 9 ,
wherein the third solid electrolyte material has lower crystallinity than the second solid electrolyte material.

12 . The solid electrolyte according to claim 9 ,
wherein the third solid electrolyte material is amorphous.

13 . The solid electrolyte according to claim 9 ,
wherein the third solid electrolyte material belongs to the same material group as the second solid electrolyte material.

14 . The solid electrolyte according to claim 9 ,
wherein the particle boundary layer is present between the first particles and the second particles.

15 . The solid electrolyte according to claim 14 ,
wherein the particle boundary layer is present between adjacent two of the first particles, and the particle boundary layer is present between adjacent two of the second particles.

16 . The solid electrolyte according to claim 9 ,
wherein the following formula is satisfied:
0.05≤( vp 2+ vgb )/( vp 1+ vp 2+ vgb )≤0.7,

where vp1 represents a volume of the first particles, vp2 represents a volume of the second particles, and vgb represents a volume of the particle boundary layer.

17 . The solid electrolyte according to claim 16 ,
wherein the following formula is satisfied:
0.05≤( vp 2+ vgb )/( vp 1+ vp 2+ vgb )≤0.5.

18 . The solid electrolyte according to claim 17 ,
wherein the following formula is satisfied:
0.05≤( vp 2+ vgb )/( vp 1+ vp 2+ vgb )≤0.3.

19 . The solid electrolyte according to claim 9 ,
wherein the following formula is satisfied:
0.05≤( vgb )/( vp 2+ vgb )≤0.15,

where vp2 represents a volume of the second particles, and vgb represents a volume of the particle boundary layer.

20 . A battery comprising:
a positive electrode; a negative electrode; and an electrolyte layer between the positive electrode and the negative electrode, wherein at least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte according to claim 1 .

21 . The battery according to claim 20 ,
wherein the electrolyte layer contains the solid electrolyte.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Koga Eiichi

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M2300/008

  Halides · CPC title

• H01M2300/0071

  Oxides · CPC title

• H01M2300/0068

  inorganic · CPC title