Solid electrolyte film for sulfide-based all-solid-state battery batteries

Patent metadata

Field	Value
Publication number	US-2023335708-A1
Application number	US-202318340403-A
Country	US
Kind code	A1
Filing date	Jun 23, 2023
Priority date	May 10, 2019
Publication date	Oct 19, 2023
Grant date	—

Abstract

A solid electrolyte film for sulfide-based all-solid-state batteries, and more particularly a composition of a solid electrolyte, a binder, and a solvent used to manufacture a solid electrolyte film for sulfide-based all-solid-state batteries that is thin and has high ion conductivity. In particular, a solid electrolyte film composition for sulfide-based all-solid-state batteries including a solvent having a dielectric constant of x (1.5<x<3.0). The thickness of a solid electrolyte film for sulfide-based all-solid-state batteries manufactured using the solid electrolyte film composition is 60 µm or less, and the solid electrolyte film is capable of being stably used for at least 1000 hours or more, and up to 2000 hours, based on the evaluation of Li plating and stripping.

First claim

1 . A method for preparing a sulfide-based solid electrolyte film comprising:
providing a mixture comprising (i) a sulfide-based solid material; (ii) a polymer binder comprising C and H therein but not comprising any of 0, N, and F therein; and (iii) a solvent having a dielectric constant of x, wherein 1.0 < x < 3.1; and processing the mixture using a wet-type manufacturing process to produce the sulfide-based solid electrolyte film.

2 . The method according to claim 1 , wherein the sulfide-based solid electrolyte is at least one of Li 6 PS 5 , Li 6 PS 5 Cl, Li 3 PS 4 , Li 10 GeP 2 S 12 , Li 3.25 Ge 0.25 P 0.75 S 4 , Li 2 S—P 2 S 5 —LiCl, Li 2 S—SiS 2 , LiI—Li 2 S—SiS 2 , LiI—Li 2 S—P 2 S 5 , LiI—Li 2 S—P 2 O 5 , LiI—Li 3 PO 4 —P 2 S 5 , Li 2 S—P 2 S 5 , Li 7 P 3 S 11 , LiI—Li 2 S—B 2 S 3 , Li 3 PO 4 —Li 2 S—Si 2 S, Li 3 PO 4 —Li 2 S—SiS 2 , LiPO 4 —Li 2 S—SiS, Li 9 . 54 S 1 . 74 P 1.44 S 11.7 Cl 0 . 3 , or Li 7 P 3 S 11 .

3 . The method according to claim 1 , wherein the sulfide-based material is selected from the group consisting of Li 6 PS 5 , Li 6 PS 5 Cl, Li 7 P 3 S 11 and mixtures thereof.

4 . The method according to claim 1 , wherein the sulfide-based solid material has an average particle diameter of 0.1 µm to 50 µm,.

5 . The method according to claim 1 , wherein the sulfide-based solid material has an average particle diameter of 0.5 µm to 20 µm.

6 . The method according to claim 1 , wherein the polymer binder is at least one of styrene-ethylene-butylene-styrene (SEBS), styrene-butadiene-styrene (SBS), or styrene-butadiene rubber (SBR).

7 . The method according to claim 6 , wherein the polymer binder is SEBS.

8 . The method according to claim 1 , wherein the solvent is at least one of benzene, CCl 4 , hexane, cyclohexane, heptane, or xylene.

9 . The method according to claim 1 , wherein the solvent is at least one of hexane, heptane, or xylene.

10 . The method according to claim 1 , wherein the solvent is at least hexane.

11 . The method according to claim 1 , wherein the solvent is at least heptane.

12 . The method according to claim 1 , wherein the mixture further comprises an inorganic solid electrolyte.

13 . The method according to claim 12 , wherein the inorganic solid electrolyte is selected from the group consisting of Li 2 O—B 2 O 3 , Li 2 O—B 2 O 3 —P 2 O 5 , Li 2 O—V 2 O 5 —SiO 2 , Li 3 PO 4 , Li 2 O—Li 2 WO 4 —B 2 O 3 , LiPON, LiBON, Li 2 O—SiO 2 , LiI, Li 3 N, Li 5 La 3 Ta 2 O 12 , Li 7 La 3 Zr 2 O 12 , Li 6 BaLa 2 Ta 2 O 12 , Li 3 PO (4-3/2w) N w (w<1), and Li 3.6 Si 0.6 P 0.4 O 4 .

14 . A solid electrolyte film for a sulfide-based all-solid-state battery, manufactured according to claim 1 .

15 . The solid electrolyte film according to claim 14 , wherein the sulfide-based solid electrolyte film is flexible.

16 . The solid electrolyte film according to claim 14 , wherein the sulfide-based solid electrolyte film has a thickness of 60 µm or less.

17 . The solid electrolyte film according to claim 14 , wherein the sulfide-based solid electrolyte film has a thickness of 50 µm or less.

18 . A sulfide-based all-solid-state battery comprising the solid electrolyte film according to claim 16 .

19 . The sulfide-based all-solid-state battery according to claim 18 , wherein an ion conductivity of the solid electrolyte film is 10 -4 S/cm or more.

20 . The sulfide-based all-solid-state battery according to claim 18 , wherein the operating time of the sulfide-based solid electrolyte film based on the evaluation of Li plating and stripping is 1000 hours or more.

Assignees

• Lg Energy Solution Ltd
• Univ California

Inventors

• Tan Darren H S
• Chen Zheng
• Meng Ying Shirley
• Jo Chi Ho
• Jung Wang Mo

Classifications

• H01M4/136 Primary

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M4/622

  being polymers · CPC title

• H01M10/3954

  containing additives or special arrangement in the sulfur compartment · CPC title

• H01M10/52 Primary

  Removing gases inside the secondary cell, e.g. by absorption (vent plugs or other mechanical arrangements for facilitating escape of gases H01M50/30) · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title