Separator, secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-2018277813-A1
Application number	US-201715701888-A
Country	US
Kind code	A1
Filing date	Sep 12, 2017
Priority date	Mar 21, 2017
Publication date	Sep 27, 2018
Grant date	—

Abstract

According to one embodiment, a separator is provided. The separator is selectively permeable to monovalent cations and includes a first surface and a second surface which is a reverse surface to the first surface. A contact angle θ1 of the first surface with respect to an aqueous electrolyte is different from a contact angle θ2 of the second surface with respect to the aqueous electrolyte.

First claim

What is claimed is:

1 . A separator, which is selectively permeable to monovalent cations, the separator comprising:
a first surface; and a second surface which is a reverse surface to the first surface, wherein a contact angle θ1 of the first surface with respect to an aqueous electrolyte is different from a contact angle θ2 of the second surface with respect to the aqueous electrolyte.

2 . The separator according to claim 1 , wherein the separator is used for a secondary battery comprising a positive electrode, a negative electrode, and the aqueous electrolyte.

3 . A secondary battery comprising:
a positive electrode; a negative electrode comprising a negative electrode active material-containing layer; an aqueous electrolyte; and a separator according to claim 1 , the separator comprising a first principal surface corresponding to the first surface and a second principal surface corresponding to the second surface, wherein at least a part of the first principal surface faces the negative electrode active material-containing layer, and the contact angle θ1 is 90°≤θ1<180°.

4 . The secondary battery according to claim 3 , wherein a whole principal surface of the negative electrode active material-containing layer is in contact with the first principal surface of the separator.

5 . The secondary battery according to claim 3 , wherein the positive electrode comprises a positive electrode active material-containing layer,
the second principal surface is in contact with the positive electrode active material-containing layer, and the contact angle θ1 is larger than the contact angle θ2.

6 . The secondary battery according to claim 5 , wherein the contact angle θ2 is 10°≤θ2<90°.

7 . The secondary battery according to claim 3 , wherein the first principal surface comprises a hydrophobic group.

8 . The secondary battery according to claim 3 , wherein the separator comprises at least one selected from the group consisting of an oxide type solid electrolyte, a polymer type solid electrolyte, a glass electrolyte, and a lithium ion exchange membrane.

9 . The secondary battery according to claim 8 , wherein the separator is formed from a glass electrolyte.

10 . The secondary battery according to claim 3 , wherein the aqueous electrolyte comprises at least one selected from a chloride ion (Cl − ), a hydroxide ion (OH − ), a sulfate ion (SO 4 2− ), a nitrate ion (NO 3 − ), and an acetate ion (CH 3 COO − ).

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

12 . The battery pack according to claim 11 , further comprising an external power distribution terminal and a protective circuit.

13 . The battery pack according to claim 11 , comprising plural of secondary batteries, wherein the secondary batteries are electrically connected in series, in parallel, or in combination of series connection and parallel connection.

14 . A vehicle comprising the battery pack according to claim 11 .

15 . The vehicle according to claim 14 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Yoshima Kazuomi
• Takami Norio
• Matsuno Shinsuke

Classifications

• H01M10/38

  Construction or manufacture · CPC title

• H01M2300/0002

  Aqueous electrolytes · CPC title

• H01M2220/20

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

• H01M10/24 Primary

  Alkaline accumulators · CPC title