Electrode, secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-2022302448-A1
Application number	US-202117461009-A
Country	US
Kind code	A1
Filing date	Aug 30, 2021
Priority date	Mar 22, 2021
Publication date	Sep 22, 2022
Grant date	—

Abstract

According to one embodiment, provided is an electrode including an active material-containing layer, which includes a titanium-niobium composite oxide, a fibrous carbon material, and one or more thickener selected from the group consisting of carboxymethyl cellulose, carboxymethyl cellulose salts, and polyvinyl pyrrolidone. In a particle size distribution of particles in the active material-containing layer, an average particle size D50 is from 1.6 μm to 3.0 μm, a particle size D10 is 1 μm or less, and a particle size D90 is 10 μm or more. The particle size distribution includes a first peak having a maximum peak intensity IMAX corresponding to a maximum frequency and a second peak positioned at 10 μm or more. The second peak has a peak intensity I2nd of 0.25 IMAX to 0.7 IMAX.

First claim

What is claimed is:

1 . An electrode comprising an active material-containing layer, the active material-containing layer comprising:
a titanium-niobium composite oxide; a fibrous carbon material; and one or more thickener selected from the group consisting of carboxymethyl cellulose, carboxymethyl cellulose salts, and polyvinyl pyrrolidone, in a particle size distribution of particles included in the active material-containing layer according to a laser diffraction scattering method, an average particle size D 50 being from 1.6 μm to 3.0 μm, a particle size D 10 at which cumulative frequency from a small particle size side is 10% being 1 μm or less, and a particle size D 90 at which cumulative frequency from the small particle size side is 90% being 10 μm or more, the particle size distribution includes a first peak having a maximum peak intensity I MAX corresponding to a maximum frequency in the particle size distribution and a second peak positioned at 10 μm or more, and the second peak has a peak intensity I 2nd of 0.25 I MAX to 0.7 I MAX with respect to the maximum peak intensity I MAX .

2 . The electrode according to claim 1 , wherein the titanium-niobium composite oxide comprises a compound having a monoclinic crystal structure and being represented by general formula Li a Ti 1-x M1 x Nb 2-y M2 y O y-δ , where 0≤a<5, 0≤x<1, 0≤y<1, −0.3≤δ≤0.3, and element M1 and element M2 each being at least one selected from the group consisting of Mg, Fe, Ni, Co, W, Ta and Mo, the element M1 and the element M2 being same or different with one another.

3 . A secondary battery comprising:
a positive electrode; a negative electrode; and an electrolyte, the negative electrode comprising the electrode according to claim 1 .

4 . A battery pack comprising the secondary battery according to claim 3 .

5 . The battery pack according to claim 4 , further comprising an external power distribution terminal and a protective circuit.

6 . The battery pack according to claim 4 , comprising plural of the secondary battery, the secondary batteries being electrically connected in series, in parallel, or in combination of in-series connection and in-parallel connection.

7 . A vehicle comprising the battery pack according to claim 4 .

8 . The vehicle according to claim 7 , wherein the vehicle comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Hoshina Keigo
• Yamashita Yasunobu
• Harada Yasuhiro
• Takami Norio

Classifications

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title

• H01M2220/20

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

• H01M2004/021

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