Cathode slurry composition, cathode manufactured using same, and battery including same

Patent metadata

Field	Value
Publication number	US-11777091-B2
Application number	US-201916958599-A
Country	US
Kind code	B2
Filing date	Jan 11, 2019
Priority date	Jan 11, 2018
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A positive electrode slurry composition, a positive electrode manufactured using the same, and a battery including the positive electrode. The positive electrode slurry composition includes a positive electrode active material, a binder, an alcohol, and water, wherein a content of the alcohol is in a range of 0.1 to 10% by weight, based on a total weight of the composition. The slurry composition for manufacturing a positive electrode has effects of highly improving the dispersibility of the positive electrode active material and the conductive material, decreasing the surface roughness of an electrode, and remarkably reducing a curling phenomenon in the electrode. Also, the slurry composition has an economic advantage in that a dispersing agent is not used or an amount of the dispersing agent used can be remarkably reduced.

First claim

The invention claimed is:

1. A positive electrode slurry composition comprising:
a positive electrode active material;
a binder;
a conductive material; and
a solvent consisting of a C1 to C5 alcohol and water,
wherein the composition comprises 10 to 78% by weight of the positive electrode active material, 1 to 50% by weight of the binder, and 0.1 to 10% by weight of the conductive material;
wherein the solvent consists of a content of the alcohol in a range of 0.1 to 10% by weight, with the balance being water, based on a total weight of the composition,
wherein the positive electrode active material is a S—C composite;
wherein the binder is a lithiated polyacrylic acid;
wherein the conductive material comprises vapor-grown carbon fibers (VGCFs);
wherein the C1 to C5 alcohol is 1-propanol; and
wherein the composition is suitable for use in manufacturing a positive electrode for lithium-sulfur batteries.

2. The positive electrode slurry composition of claim 1 , wherein the solvent consists of 1 to 7% by weight of the alcohol and 93 to 99% by weight of water, based on a sum of weights of the alcohol and water.

3. The positive electrode slurry composition of claim 1 , wherein the composition comprises 2 to 45 parts by weight of the alcohol, based on a total of 100 parts by weight of the positive electrode active material and the conductive material.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Lee Jaegil
• Yang Doo Kyung
• Kim Yu Mi
• Kim Yun Kyoung
• Cho Eunkyung

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/0404 Primary

  by coating on electrode collectors · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/624

  Electric conductive fillers · CPC title