Binder solution for all-solid-state batteries, electrode slurry including the binder solution, and method of manufacturing all-solid-state battery using the electrode slurry

Patent metadata

Field	Value
Publication number	US-11342562-B2
Application number	US-201916291847-A
Country	US
Kind code	B2
Filing date	Mar 4, 2019
Priority date	Aug 16, 2018
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

The present disclosure relates to a binder solution for all-solid-state batteries. The binder solution includes a polymer binder, a first solvent, and an ion-conductive additive, wherein the ion-conductive additive includes lithium salt and a second solvent, which is different from the first solvent.

First claim

What is claimed is:

1. A binder solution for all-solid-state batteries, the binder solution comprising:
greater than 0 wt % to 10 wt % of a polymer binder;
greater than 0 wt % to 10 wt % of an ion-conductive additive; and
a remaining quantity of a first solvent,
wherein the ion-conductive additive comprises lithium salt and a second solvent, which is different from the first solvent,
wherein the first solvent has a dielectric constant (ε) of 1 to 10 and a Gutmann donor number (DN) of 0 to 10,
wherein the second solvent has a dielectric constant (ε) of 5 to 10 and a Gutmann donor number (DN) of 10 to 20,
wherein the first solvent is dibromomethane,
wherein the second solvent is selected from a group consisting of triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 18-Crown-6, or mixtures thereof,
wherein an absolute value (|Ag|) of a difference in dielectric constant between the first solvent and the second solvent ranges from 0 to 5, and
wherein the polymer binder is nitrile-butadiene rubber (NBR).

2. The binder solution according to claim 1 , wherein the lithium salt is selected from a group consisting of lithium hexafluorophosphate (LiPF 6 ), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium bis(pentafluoroethanesulfonyl)imide (LiBETI), or mixtures thereof.

3. The binder solution according to claim 1 , wherein
the second solvent comprises an oxygen element, and
a lithium element of the lithium salt exists in a state of being bonded with the oxygen element in the second solvent.

4. An electrode slurry comprising:
the binder solution according to claim 1 ;
an electrode active material;
a conductive material; and
a solid electrolyte.

5. The electrode slurry according to claim 4 , wherein the electrode slurry comprises:
greater than 0 wt % to 30 wt % of the binder solution;
greater than 0 wt % to 10 wt % of the conductive material;
greater than 0 wt % to 20 wt % of the solid electrolyte; and
a remaining quantity of the electrode active material.

Assignees

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

Inventors

• Kim Sang Mo
• Yoon Yong Sub
• Lim Jae Min
• Kim Jin Soo
• Lee Sang Heon
• Jung Yoon Seok
• Nam Young Jin
• Jung Sung Hoo
• Oh Dae Yang

Classifications

• H01M10/058

  Construction or manufacture · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/131

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

• H01M10/0525

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

• H01M2300/0068

  inorganic · CPC title