IP Library › Granted Patent US 12,401,041
Granted Patent B2
US 12,401,041 · App. 17/906,263 · Granted Aug 26, 2025

Conductive material dispersion liquid, slurry for secondary battery positive electrode, positive electrode for secondary battery, and secondary battery

Inventor: Naoki Takahashi (Tokyo, JP)
Assignee: ZEON CORPORATION
H01M4/625H01M10/0525H01M2004/028
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Quick Facts
Patent No.
US 12,401,041
App. No.
17/906,263
Granted
Aug 26, 2025
Kind
B2
Abstract

Provided is a conductive material dispersion liquid that can reduce internal resistance of a secondary battery while also ensuring good high-temperature storage characteristics of the secondary battery. The conductive material dispersion liquid contains a carbon material, a dispersant, and a dispersion medium. An HSP distance (R d ) of Hansen solubility parameters (HSP c ) of the carbon material and Hansen solubility parameters (HSP d ) of the dispersant is 10.0 MPa 1/2 or less.

Claims (10)

1. A conductive material dispersion liquid comprising a carbon material, a dispersant, and a dispersion medium, wherein

an HSP distance (R d ) of Hansen solubility parameters (HSP c ) of the carbon material and Hansen solubility parameters (HSP d ) of the dispersant is 10.0 MPa 1/2 or less, and

the dispersant includes a hydrogenated 1,3-butadiene unit, and 1,2-bonded hydrogenated butadiene units are 4.0 mass % or more and 15 mass % or less when all hydrogenated 1,3-butadiene units in the dispersant are taken to be 100 mass %.

2. The conductive material dispersion liquid according to claim 1 , wherein a hydrogen bonding term δ h1 among the Hansen solubility parameters (HSP c ) of the carbon material is 12.0 MPa 1/2 or less.

3. The conductive material dispersion liquid according to claim 1 , wherein the carbon material includes a fibrous carbon material.

4. A slurry for a secondary battery positive electrode comprising: the conductive material dispersion liquid according to claim 1 ; and a positive electrode active material.

5. The slurry for a secondary battery positive electrode according to claim 4 , further comprising a binder.

6. The slurry for a secondary battery positive electrode according to claim 5 , wherein an HSP distance (R b ) of the Hansen solubility parameters (HSP c ) of the carbon material and Hansen solubility parameters (HSP b ) of the binder is larger than the HSP distance (R d ).

7. A positive electrode for a secondary battery comprising a positive electrode mixed material layer formed using the slurry for a secondary battery positive electrode according to claim 4 .

8. A secondary battery comprising the positive electrode for a secondary battery according to claim 7 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 14, 2022
From: TAKAHASHI, NAOKI
To: ZEON CORPORATION
Reel/Frame 061083/0636 →
Priority Claims (1)
JP 2020-061327 · Mar 30, 2020 · national
Continuity (1)
Related Publication 20230129636A1 · Apr 27, 2023
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