Secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-2018083286-A1
Application number	US-201715445057-A
Country	US
Kind code	A1
Filing date	Feb 28, 2017
Priority date	Sep 16, 2016
Publication date	Mar 22, 2018
Grant date	—

Abstract

According to one embodiment, a secondary battery is provided. The secondary battery includes a positive electrode, a negative electrode, and an electrolyte including a water-containing solvent and a lithium ion. The negative electrode includes an aluminum-containing negative electrode current collector and a boehmite-containing cover layer, and the boehmite-containing cover layer is provided on at least a part of a surface of the negative electrode current collector, and has a thickness of 10 nm to 1000 nm.

First claim

What is claimed is:

1 . A secondary battery comprising:
a positive electrode; a negative electrode; and an electrolyte comprising a water-containing solvent and a lithium ion, wherein the negative electrode comprises an aluminum-containing negative electrode current collector and a boehmite-containing cover layer, and the boehmite-containing cover layer is provided on at least a part of a surface of the negative electrode current collector, and has a thickness of 10 nm to 1000 nm.

2 . The secondary battery according to claim 1 , wherein a portion with the cover layer provided on the surface of the negative electrode current collector shows a peak originated from an Al—O bond of the boehmite within a range of 350±20 cm −1 in a spectrum obtained by micro-Raman spectroscopy using a light source with a wavelength of 532 nm.

3 . The secondary battery according to claim 1 , wherein the cover layer has a thickness of 100 nm to 1000 nm.

4 . The secondary battery according to claim 1 , wherein a concentration of the lithium ion in the electrolyte is from 3 M to a saturated concentration.

5 . The secondary battery according to claim 1 , wherein the lithium ion is a cation derived from a lithium salt, and the lithium salt is at least one selected from the group consisting of lithium chloride, lithium nitrate, and lithium sulfate.

6 . The secondary battery according to claim 1 , wherein the electrolyte has a pH of 2 to 12.

7 . The secondary battery according to claim 1 , wherein the negative electrode comprises an active material which comprises at least one selected from the group consisting of a spinel lithium titanium oxide and an anatase titanium oxide.

8 . The secondary battery according to claim 1 , wherein the negative electrode comprises a negative electrode active material layer, and the cover layer is formed on a whole surface opposite to the negative electrode active material layer on the surface of the negative electrode current collector.

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

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 , comprising a plural of the secondary batteries, wherein the secondary batteries are 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 , wherein the battery pack is configured to recover a regenerative energy caused by power of the vehicle.

Assignees

• Toshiba Kk

Inventors

• Ise Kazuki
• Yamashita Yasunobu
• Matsuno Shinsuke
• Takami Norio
• Inagaki Hiroki

Classifications

• H01M50/233

  characterised by physical properties of casings or racks, e.g. dimensions · CPC title

• H01M50/231

  having a layered structure · CPC title

• H01M50/224

  Metals · CPC title

• H01M50/227

  Organic material · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title