Secondary battery, battery pack, vehicle, and stationary power supply

Patent metadata

Field	Value
Publication number	US-2023116728-A1
Application number	US-202217651130-A
Country	US
Kind code	A1
Filing date	Feb 15, 2022
Priority date	Sep 15, 2021
Publication date	Apr 13, 2023
Grant date	—

Abstract

According to one embodiment, a secondary battery including an electrode and an aqueous electrolyte is provided. The electrode includes a resin current collector. The resin current collector includes a resin matrix and an electro-conductive filler. The aqueous electrolyte includes water.

First claim

What is claimed is:

1 . A secondary battery comprising:
an electrode, the electrode comprising a resin current collector, the resin current collector comprising a resin matrix and an electro-conductive filler; and an aqueous electrolyte comprising water.

2 . The secondary battery according to claim 1 , wherein the resin matrix has a water absorption capacity of 0.001 wt% or more and 0.5 wt% or less.

3 . The secondary battery according to claim 1 , wherein the electro-conductive filler comprises a carbon material.

4 . The secondary battery according to claim 1 , wherein a contact angle with water on a surface of the resin current collector is larger than 105°.

5 . The secondary battery according to claim 1 , wherein the resin current collector comprises fluorine on a surface thereof, and the fluorine is bonded to at least part of carbon comprised in the resin matrix.

6 . The secondary battery according to claim 5 , wherein a surface abundance ratio of the fluorine in the resin current collector is larger than a surface abundance ratio of the carbon in the resin current collector.

7 . The secondary battery according to claim 1 , wherein the resin current collector comprises an antioxidant.

8 . The secondary battery according to claim 7 , wherein the resin current collector has a multilayer structure comprising a surface layer and an inner layer, the surface layer comprises the antioxidant, and the inner layer does not comprise the antioxidant.

9 . The secondary battery according to claim 7 , wherein the resin current collector comprises 1 part by mass or more of the antioxidant relative to 100 parts by mass of the resin matrix.

10 . The secondary battery according to claim 7 , wherein the antioxidant has a solubility in water of 4 g/100 mL or less at room temperature.

11 . The secondary battery according to claim 1 , wherein a surface abundance ratio of oxygen in the resin current collector is 1.2 times or more an abundance ratio of oxygen at a depth of 0.1 µm from a surface of the resin current collector, by X-ray photoelectron spectroscopy.

12 . The secondary battery according to claim 1 , wherein a surface abundance ratio of zinc in the resin current collector is 1.2 times or more an abundance ratio of zinc at a depth of 0.1 µm from a surface of the resin current collector, by X-ray photoelectron spectroscopy.

13 . The secondary battery according to claim 1 , wherein the electrode comprises a titanium-containing oxide.

14 . A battery pack comprising the secondary battery according to claim 1 .

15 . The battery pack according to claim 14 , further comprising an external power distribution terminal and a protective circuit.

16 . The battery pack according to claim 14 , further 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.

17 . A vehicle comprising the battery pack according to claim 14 .

18 . The vehicle according to claim 17 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

19 . A stationary power supply comprising the battery pack according to claim 14 .

Assignees

• Toshiba Kk

Inventors

• Hotta Yasuyuki
• Yoshima Kazuomi
• Hoshina Keigo
• Kuboki Takashi
• Matsuno Shinsuke

Classifications

• H01M2300/0002

  Aqueous electrolytes · CPC title

• H01M2220/10

  Batteries in stationary systems, e.g. emergency power source in plant · CPC title

• H01M4/668 Primary

  Composites of electroconductive material and synthetic resins · CPC title

• H01M4/625 Primary

  Carbon or graphite · CPC title

• H01M4/667

  in the form of layers, e.g. coatings · CPC title