Carbon black for batteries, conductive composition for electrodes, electrode for batteries, and battery

Patent metadata

Field	Value
Publication number	US-11098201-B2
Application number	US-201716327265-A
Country	US
Kind code	B2
Filing date	Aug 8, 2017
Priority date	Aug 24, 2016
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

An object of the present invention is to provide a carbon black for batteries having excellent dispersibility, electron conductivity and oxidation resistance. In addition, an object of the present invention is to provide a low-viscosity conductive composition for an electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition.A carbon black for batteries having: BET specific surface area of 50 to 220 m2/g; a crystallite diameter (La) of 30 to 42 Å; and a number of CO2 desorption molecules per unit surface area measured by a temperature-rising desorption gas analysis method (50° C. to 1200° C. of measurement temperature) of 8.0×1016 to 15.0×1016 molecules/m2 is excellent in dispersibility, electron conductivity and oxidation resistance. A conductive composition for a low-viscosity electrode produced using the carbon black, and a low-resistance battery electrode and a battery having excellent high-output characteristics and cycle characteristics produced using the conductive composition can be obtained.

First claim

The invention claimed is:

1. A carbon black for batteries having:
BET specific surface area of 50 to 220 m 2 /g;
a crystallite diameter (La) of 30 to 42 Å;
a DBP oil absorption amount of 240 to 310 mL/100 g;
a grain gauge according to JIS K 5600-2-5 of 5 to 10 μm;
an oxidative decomposition current value of 0.05 to 0.12 mA/cm 2 ; and
a number of CO 2 desorption molecules per unit surface area measured by a temperature-rising desorption gas analysis method of 8.0×10 16 to 15.0×10 16 molecules/m 2 , wherein the temperature-rising desorption gas analysis method is performed at 50° C. to 1200° C. of measurement temperature.

2. The carbon black of claim 1 , wherein the carbon black has a localized electron spin density per unit surface area at 23° C. is 8.0×10 16 spins/m 2 or less.

3. The carbon black of claim 1 , wherein the carbon black is an acetylene black.

4. A conductive composition for an electrode comprising an active material, a polymer binder and the carbon black of claim 1 .

5. An electrode for batteries comprising the carbon black of claim 1 .

6. A battery comprising the electrode of claim 5 .

Assignees

• Denka Company Ltd

Inventors

• Nagai Tatsuya
• Osumi Shinichiro
• Ikeda Daiki
• Ito Tetsuya
• Yokota Hiroshi

Classifications

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• C01P2006/60

  Optical properties, e.g. expressed in CIELAB-values · CPC title

• C09C1/00

  Treatment of specific inorganic materials other than fibrous fillers (tenebrescent materials C09K9/00; luminescent materials C09K11/00); Preparation of carbon black · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/625 Primary

  Carbon or graphite · CPC title