Conductive auxiliary agent, electrode material for battery, and method for manufacturing electrode material for battery

Patent metadata

Field	Value
Publication number	US-10658667-B2
Application number	US-201815939276-A
Country	US
Kind code	B2
Filing date	Mar 29, 2018
Priority date	Mar 29, 2017
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A conductive auxiliary agent for an electrode slurry for a battery. The electrode slurry contains an electrode active material and a conductive auxiliary agent, and is applied to a sheet-shaped current collector. The conductive auxiliary agent is a carbon paste produced by dispersing a carbon powder in a solvent. The carbon paste has a viscosity of at least 20 Pa·s and not more than 40 Pa·s. The carbon material can be acetylene black.

First claim

What is claimed is:

1. A conductive auxiliary agent for an electrode slurry for a battery, the electrode slurry containing an electrode active material and the conductive auxiliary agent and applied to a sheet-shaped current collector, wherein
the conductive auxiliary agent is a carbon paste produced by dispersing a carbon powder in water, and
the carbon paste is 20 wt % to 23 wt % acetylene black and has a dynamic viscosity of at least 20 Pa·s and not more than 40 Pa·s at a predetermined shear rate D (1/sec).

2. An electrode slurry for a battery containing an electrode active material and a conductive auxiliary agent, the electrode slurry for a battery applied to a flat planar current collector,
wherein the conductive auxiliary agent is a carbon paste with a dynamic viscosity of at least 20 Pa·s and not more than 40 Pa·s at a predetermined shear rate D (1/sec), the carbon paste being produced by dispersing a carbon powder in water, and
the carbon paste is 20 wt % to 23 wt % acetylene black.

3. A method for manufacturing an electrode plate for a battery having a planar metallic current collector, the method comprising:
preparing an electrode slurry for a battery containing a mixture containing an electrode active material, a conductive auxiliary agent, and a binder,
wherein the conductive auxiliary agent is a carbon paste produced by dispersing a carbon powder in water;
using a mixer, kneading the electrode active material, the conductive auxiliary agent, and the binder in N-Methyl-2-pyrrolidone (NMP); and
using a squeegee, applying the electrode slurry to a surface of the current collector,
wherein the carbon paste is 20 wt % to 23 wt % acetylene black and has a dynamic viscosity of at least 20 Pa·s and not more than 40 Pa·s at a predetermined shear rate D (1/sec) as measured using a rheometer.

Assignees

• Fdk Corp

Inventors

• Ochiai Yuki
• Nishimura Naoaki
• Hirata Daisuke
• Yamamoto Keita

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H04B1/22

  for receivers in which no local oscillation is generated · CPC title

• H01M10/0525

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

• H01M4/625 Primary

  Carbon or graphite · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title