Secondary battery, composite electrolyte, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-2018241083-A1
Application number	US-201715691197-A
Country	US
Kind code	A1
Filing date	Aug 30, 2017
Priority date	Feb 21, 2017
Publication date	Aug 23, 2018
Grant date	—

Abstract

According to one embodiment, a composite electrolyte includes 0.1% by weight to 10% by weight of polymer fibers, lithium-containing inorganic particles and an organic electrolytic solution. The polymer fibers have an average diameter of 1 nm to 100 nm. The organic electrolytic solution contains lithium ions.

First claim

What is claimed is:

1 . A composite electrolyte comprising:
0.1% by weight to 10% by weight of polymer fibers having an average diameter of 1 nm to 100 nm; lithium-containing inorganic particles; and an organic electrolytic solution containing lithium ions.

2 . A secondary battery comprising:
a positive electrode active material-containing layer; a negative electrode active material-containing layer; and a composite electrolyte provided on a surface of at least one of the positive electrode active material-containing layer and the negative electrode active material-containing layer, and wherein the composite electrolyte is the composite electrolyte according to claim 1 .

3 . The secondary battery according to claim 2 ,
wherein: a specific surface area of the lithium-containing inorganic particles according to a BET adsorption method using N 2 is 10 m 2 /g to 500 m 2 /g; and a content of the lithium-containing inorganic particles of the composite electrolyte is 85% by weight to 98% by weight.

4 . The secondary battery according to claim 2 , wherein the lithium-containing inorganic particles contain lithium ion conductive inorganic solid electrolyte particles.

5 . The secondary battery according to claim 2 , wherein the polymer fibers contain cellulose.

6 . The secondary battery according to claim 2 , wherein the negative electrode active material-containing layer contains a titanium-containing oxide.

7 . The secondary battery according to claim 6 , wherein the titanium-containing oxide contains at least one selected from group consisting of a lithium titanium oxide having a spinel structure, a monoclinic titanium oxide, and a niobium titanium oxide.

8 . The secondary battery according to claim 2 , further comprising a current collector having a first surface and a second surface located opposite to the first surface,
wherein the secondary battery has a bipolar structure in which the positive electrode active material-containing layer is provided on the first surface of the current collector, and the negative electrode active material-containing layer is provided on the second surface.

9 . A battery pack comprising one or more of secondary batteries, each according to claim 2 .

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 two or more of the secondary batteries, wherein the two or more secondary batteries are electrically connected in series, in parallel, or in combination of series and parallel.

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

13 . The vehicle according to claim 12 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Takami Norio
• Harada Yasuhiro
• Iwasaki Takuya

Classifications

• H01M10/0569 Primary

  characterised by the solvents · CPC title

• H01M10/0418

  with bipolar electrodes · CPC title

• B60L50/64

  Constructional details of batteries specially adapted for electric vehicles · CPC title

• H01M10/0561

  the electrolyte being constituted of inorganic materials only · CPC title

• B60L58/10

  for monitoring or controlling batteries · CPC title