Binder solution having lithium ion conductivity for all-solid-state battery and electrode slurry comprising same

Patent metadata

Field	Value
Publication number	US-2021202949-A1
Application number	US-202017092927-A
Country	US
Kind code	A1
Filing date	Nov 9, 2020
Priority date	Dec 26, 2019
Publication date	Jul 1, 2021
Grant date	—

Abstract

The present disclosure relates to a binder solution having lithium ion conductivity for an all-solid-state battery and an electrode slurry including the same. Specifically, the binder solution includes a first binder having high binding force, a second binder having higher lithium ion conductivity than that of the first binder, a lithium salt, and an organic solvent that dissolves the lithium salt.

First claim

1 . A binder solution for an all-solid-state battery, comprising:
a first binder having a lithium ion conductivity; a second binder having a lithium ion conductivity higher than the lithium ion conductivity of the first binder; a lithium salt; and an organic solvent that dissolves the lithium salt.

2 . The binder solution of claim 1 , wherein the first binder is selected from the group consisting of nitrile-butadiene rubber (NBR), butadiene rubber (BR), styrene-butadiene rubber (SBR) and combinations thereof.

3 . The binder solution of claim 1 , wherein the lithium ion conductivity (σ 1 ) of the first binder is 10 −6 S/cm to 10 −7 S/cm.

4 . The binder solution of claim 1 , wherein the second binder is selected from the group consisting of polypropylene carbonate) (PPC), poly(vinyl acetate) (PVA), poly(1,4-butylene adipate) (PBA) and combinations thereof.

5 . The binder solution of claim 1 , wherein the second binder is at least partially miscible with the first binder.

6 . The binder solution of claim 1 , wherein a lithium ion conductivity ratio (σ 2 /σ 1 ) of the second binder and the first binder is 100 to 4,000.

7 . The binder solution of claim 1 , wherein the lithium salt is selected from the group consisting of lithium hexafluorophosphate (LiPF 6 ), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium bis(pentafluoroethanesulfonyl)imide (LiBETI) and combinations thereof.

8 . The binder solution of claim 1 , wherein the organic solvent is selected from the group consisting of benzyl acetate, ethyl 4-methylbenzoate, anisole, ethyl p-anisate, benzyl isobutyrate and combinations thereof.

9 . The binder solution of claim 1 , wherein the organic solvent has a boiling point of 150° C. to 300° C.

10 . The binder solution of claim 1 , wherein the organic solvent has a vapor pressure of 0.001 mmHg to 10 mmHg at room temperature.

11 . The binder solution of claim 1 , comprising:
10 wt % or less but exceeding 0 wt % of the first binder and the second binder; 10 wt % or less but exceeding 0 wt % of the lithium salt; and a remainder of the organic solvent.

12 . The binder solution of claim 1 , wherein a weight ratio (m 2 /m 1 ) of the second binder and the first binder is 3 or less but greater than 0.

13 . An electrode slurry for an all-solid-state battery, comprising:
the binder solution of claim 1 ; an electrode active material; a conductive material; and a solid electrolyte.

14 . The electrode slurry of claim 13 , comprising:
30 wt % or less but exceeding 0 wt % of the binder solution; 10 wt % or less but exceeding 0 wt % of the conductive material; 20 wt % or less but exceeding 0 wt % of the solid electrolyte; and a remainder of the electrode active material.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Univ Hanyang Ind Univ Coop Found

Inventors

• Kim Sang Mo
• Lim Jae Min
• Lee Sang Heon
• Kwon Tae Young
• Seok Hoon
• Jung Yoon Seok
• Kim Kyu Tae
• Oh Dae Yang

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title