Electrode slurry, electrode, secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-2024313222-A1
Application number	US-202318485449-A
Country	US
Kind code	A1
Filing date	Oct 12, 2023
Priority date	Mar 17, 2023
Publication date	Sep 19, 2024
Grant date	—

Abstract

According to one embodiment, provided is an electrode slurry including carboxymethyl cellulose and niobium oxide particles. A degree of etherification of the carboxymethyl cellulose is 0.6 or more and 1.0 or less. A contact angle with water according to a permeation rate method of the niobium oxide particles is 83° or more.

First claim

What is claimed is:

1 . An electrode slurry comprising:
carboxymethyl cellulose having a degree of etherification of 0.6 or more and 1.0 or less; and niobium oxide particles having a contact angle with water according to a permeation rate method of 83° or more.

2 . The electrode slurry according to claim 1 , wherein an average particle size x (μm) of the niobium oxide particles is 1.5 μm or less, and a 1% viscosity y (mPa·s) of the carboxymethyl cellulose satisfies y≤x×100 mPa·s/μm.

3 . The electrode slurry according to claim 2 , wherein the average particle size x (μm) of the niobium oxide particles is 0.4 μm or more.

4 . The electrode slurry according to claim 1 , further comprising a binder or further comprising the binder and an electro-conductive agent, wherein a total content of the carboxymethyl cellulose, the binder, and the electro-conductive agent is 0.5 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the niobium oxide particles.

5 . An electrode comprising:
carboxymethyl cellulose having a degree of etherification of 0.6 or more and 1.0 or less; and niobium oxide particles having a contact angle with water according to a permeation rate method of 83° or more.

6 . The electrode according to claim 5 , wherein an average particle size x (μm) of the niobium oxide particles is 0.4 μm or more and 1.5 μm or less, and a 1% viscosity y (mPa·s) of the carboxymethyl cellulose satisfies y≤x×100 mPa·s/μm.

7 . The electrode according to claim 5 , further comprising a binder or further comprising the binder and an electro-conductive agent, wherein a total content of the carboxymethyl cellulose, the binder, and the electro-conductive agent is 0.5 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the niobium oxide particles.

8 . A secondary battery comprising:
a positive electrode; a negative electrode; and an electrolyte, wherein the negative electrode includes the electrode according to claim 5 .

9 . A battery pack comprising the secondary battery according to claim 8 .

10 . The battery pack according to claim 9 , further comprising:
an external power distribution terminal; and a protective circuit.

11 . The battery pack according to claim 9 , further comprising plural of the secondary battery, the secondary batteries being electrically connected in series, in parallel, or in a combination of in series and in parallel.

12 . A vehicle comprising the battery pack according to claim 9 .

13 . The vehicle according to claim 12 , comprising a mechanism that converts kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Murata Yoshiaki
• Yamashita Yasunobu
• Harada Yasuhiro
• Takami Norio

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• C01P2006/22

  Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability · CPC title